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HomeMy WebLinkAboutWPO201400077 VSMP - SWPPP 2015-06-03 • Stantec Transmittal Stantec Consulting Services Inc. 5209 Center Street, Williamsburg, VA 23188 To: Mr. Andrew Boninti From: Scott C. Blossom, P.E. Company: Rivanna Village LLC ❑ For Your Information Address: 314 East Water Street ❑ For Your Approval Charlottesville VA 22902 ❑ For Your Review Phone: 434-284-4006 As Requested Date: June 3, 2015 File: 203400205 Delivery: FedEx Reference: Rivanna Village Attachment: Copies Doc Date Pages Description 2 6/3/15 23 Erosion and Sediment Control Plan- Rivanna Village- Phase 1 -Stage 1 & 2 2 6/3/15 23 Stormwater Management Plan-Rivanna Village-Phase 1 1 6/1/15 83 Stormwater Pollution Prevention Plan (SWPPP) 1 N/A 2 VSMP Application for Albemarle County 2 N/A N/A CDs-Submittal and Calculations 2 6/3/15 22 Annotated comment response to Albemarle County Enclosed are the plans and associated documents for your review, signature, and submittal to Albemarle County. Stantec Consulting Services Inc. Scott Blossom Senior Engineer Phone: (757) 220-6869 Fax: (757) 229-4507 Design with community in mind id\\us 1265-fOl\shared_projects\203400205\03_data\cgpswppp\trn_swppp_and_plan_submittal_20150602.docx ® Stantec Memo To: Mr. Max Greene From: Scott C. Blossom P.E. Rivanna Village Phase 1 Williamsburg, VA 23188 File: Rivanna Village WPO 201400077 Date: June 3, 2015 Dear Mr. Greene, This annotated comment response is provided to address County comments received on 3/11/2015. Responses are listed in italics below for your review in coordination with the plan sets. We appreciate your time and consideration in the interest of moving for to plan approval and issuance of the VSMP permit (attached). VSMP Permit plan review This submittal is provided in accordance with VSMP application content requirements found in County Code section 17-401. A. Stormwater Pollution Prevention Plan (SWPPP) The SWPPP content requirements can be found in County Code section 17-405. A SWPPP must contain (1) a PPP, (2) an ESCP, (3) a SWMP, and (4) any TMDL measures necessary. °r.. 1. The registration statement appears to be in error.The land development is listed as 94.66 acres and disturbed area as 40.93.The plans submitted show 58.8 acres "project limits" and 36.5 acres disturbed.The registrations statement and SWPPP will only be permitted for areas with approved plans. Previously addressed. LOD =32.42 acres. 2. Plans included with the SWPPP must be approved plans.The SWPPP includes a "Preliminary Stormwater Concept" plan. This does not appear to have been included with ZMA20 1 3000 1 2 or earlier plans, and so does not appear to have any official standing. It should not be part of the SWPPP. Previously addressed. 3. Include an explanation of the staging and phasing in the SWPPP.The concept of a stage 3, in which the ultimate development is not considered per 9VAC25-870-72, presents some difficulties, and we will have to run this by DEQ personnel for guidance. The concept of a stage 3 interim plan set is now removed from the plan set. A two stage erosion and sediment control plan and stormwater plan is now included - Stage 1 erosion and sediment control: construction entrance & perimeter controls - Stage 2 erosion and sediment control: sediment traps and basins - Stormwater plan: final stabilization and BMPs Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx ® Stantec June 3,2015 Mr. Max Greene Page 2 of 22 Reference: Rivanna Village WPO 201400077 4. Please follow the standard Albemarle County SWPPP template. Including more is fine, but it should at least have the template items. The SWPPP is now revised on the Albemarle County template. A. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17-404. Previously addressed. B. Stormwater Management Plan (SWMP) The stormwater management plan content is designed in accordance with the specifications found in County Code section 17-403. 1. Provide the VRRM spreadsheets for each section of the site. A full review could not be completed, as these were not included in the submittal. Please ensure that the areas used in the computation, both for drainage to each facility, and for disturbed area load computations turf,forest, and impervious, appear on a plan sheet or map. Rev 1: The spreadsheets were received. Thank you. The areas used in the spreadsheet computations were not received. The areas are clearly shown on plan sheets 22 and 23. As an example,for AS3A, the 1.34 acre and 6.84 acre areas in the spreadsheet are not shown on sheet 4 or 5. Instead, 1.14, 6.2 and 0.84 are shown on these sheets. AS3A is separated into three cells and the two additional swales are vegetated swales per State guidance. The drainage area to AS3A is now subdivided. Two drainage areas (AS3c-1, 2) drain though a wet swale then to the multi cell bioretention cell. One drainage area (AS3b) drains through a dry swale then to the multi cell biorenetion swale. Three other drainage areas (AS3a-1,2,3) drain to individual cells. The subdrainage areas are all less than 2.5 acres, with the exception of cell AS3a-2, which receives sub watersheds totaling 2.80 acres. Approximately 40% of this drainage area is open space or vegetated buffer. These drainage areas now match with the VRRM spreadsheets and summaries provided in the "Stormwater calculations"report incorporated by reference into the plans. Note that the areas presented on the VRRM spreadsheets are also shown on sheets 22 and 23 of the plan set. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx , Stantec • June 3,2015 Mr.Max Greene Page 3 of 22 Reference: Rivanna Village WPO 201400077 Also,the spreadsheet indicates only turf and forested areas, when the plan clearly shows part of Glenmore Way in the drainage area. This portion of Glenmore Way is now included in the spreadsheets, and is within DA AS3a- 1,2,3 and AS3c-1,2. 2. Where preserved/forested areas are credited in the computations,there must be temporary physical barriers and permanent easement measures provided to ensure they remain undisturbed. Rev 1: Not addressed. There are no barriers on the plan, and no easements, and no definitive way of measuring the preserved areas to assure they remain undisturbed. Limits of disturbance are not enough, and plastic safety fence is insufficient. Thin strips of wooded area are unlikely to be viable at all. Wooded areas accounted for in the VRRM calculations are now depicted clearly on the plans as the area that was preferred (70 foot width along Glenmore Way) as a component of the re-zoning case (see sheets 4,5,8 and 27). The areas will be preserved and enhanced with supplemental plantings to maintain a vegetated buffer that is protected by easement per the agreement set forth in the proffer. This area will be clearly marked with appropriate signage. `'fir 3. The "project limits" shown on plans are confusing. It is unclear what they represent, as the limits of disturbance, parcel boundaries, and drainage areas appear to provide what is necessary. Rev 1: Please remove the project limits. Most plans use a bold line for parcel boundaries. The overall project limits are now removed, and the Phase 1 Limits of disturbance are now the only project area shown. The parcel lines are now bolder. 4. The stormwater plan seems to have temporary measures still shown, like construction entrances,temporary stream crossings, silt fence, haul roads, and diversions. Notes even indicate temporary perimeter measures to remain.Temporary measures should be finished, removed, and the site fully stabilized/vegetated for the stormwater management phase. Grading and formal channels should be provided to direct drainage if necessary rather than temporary diversions. Rev 1: Please remove temporary construction (erosion control, haul roads etc) measures on the stormwater management plan. Temporary measures are now removed from the stormmwater management plan. 5. Uncollected areas will need to be accounted for in the load computations. 'err Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 4 of 22 Reference: Rivanna Village WPO 201400077 Uncollected areas are included in the load computations (see summary provided on sheet 4 and attached "stormwater calculations"report) and a shaded hatch is now added to sheet 23 to indicate these areas. 6. Provide planting plans, or typical areas to be repeated when planting within each facility. It is unclear how the tables are to be implemented. The planting plans are now updated with quantities and species. See sheets 7, 10, 14, and 17. 7. Keep to standard engineer scales. (i.e. not 70) Standard engineer scales are now included in the plan set as requested. The only sheets that were remaining at 150 and 250 were the cover and the hydrology summary, neither of which is provided for construction layout nor need scaled. However, we have now adjusted those sheets to standard engineer scales. The site seems to be divided into four main areas, outlined in the graphic below, and only limited detailed review could be provided without the load and load area computations. Facility sizing and removals could not be checked at this time. Nur Please note that all sizing information is provided on the sidebar of each plan and profile sheet, corresponding to the facility sizing. In addition, an overall summary was/is included on the master plan sidebar(sheet 4). This information was included on the plan set with the original submittal and is still included/updated as requested. Load computations are clearly provided for all drainage areas within the project limits, and correspond with the aforementioned VRRM spreadsheets. Graphical summary of land cover assumptions is provided on sheet 23. Load and load area computation summaries are provided on sheet 4 and in the Virginia Runoff Reduction spreadsheets included in the "stormwater calculations"report. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx ' - . ® Stantec ,...., ' June 3,2015 Mr. Max Greene Page 5 of 22 Now- Reference: Rivanna Village WPO 201400077 rftrij ,, r ` t( 'z 4 '9..�. .%'d , - ? ' .` tr' �. a ,�L t r. - t. ., "I j. ( ,i 1 ' ...I t i • 9:�ey ).. �1 %;yi ~ A J � --' 1 I A i t*,, ! ', 4, 1 is'' ty k. pa.ww j \<i f L.,:,-, 1 Area 1: 1. The wet swale needs a water source for the new wetland. The existing wetlands have the stream.The proposed wet swale appears to sit 6 feet above on constructed fill. Rev 1: Previously addressed. Changed to bioretention basin AS3B. 2. Bioretention basins have a maximum drainage area of 2.5 acres. Please adhere to the guidelines in the state specification. The proposed bioretention has 8 acres drainage too it, which is too large. a.) AS3A is separated into three cells and the two additional swales are vegetated swales a`"'` per State guidance. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • . ® Stantec June 3,2015 Mr.Max Greene Page 6 of 22 Reference: Rivanna Village WPO 201400077 b.) The drainage area to AS3A is now subdivided. Two drainage areas (AS3c-1, 2) drain though a wet swale then to the multi cell bioretention cell. One drainage area (AS3b) drains through a dry swale then to the multi cell biorenetion swale. Three other drainage areas (AS30-1,2,3) drain to individual cells. c.) The subdrainage areas are all less than 2.5 acres, with the exception of cell AS3a-2, which receives sub watersheds totaling 2.80 acres. Approximately 40%of this drainage area is open space or vegetated buffer. d.) These drainage areas now match with the VRRM spreadsheets and summaries provided in the "Stormwater calculations"report incorporated by reference into the plans. Note that the areas presented on the VRRM spreadsheets are also shown on sheets 22 and 23 of the plan set. e.) The bioretention cell is designed with an adequate spillway. 3. Grass channel AS3a-1 is too steep and not wide enough. Please adhere to the guidelines in the state specification. *ewe Proposed grading now maintains equal to or less than 4%slope for the entire length of swales AS3b and AS3c. The bottom width of calculations and proposed grading is now 4 ft. The both each swale (wet swale proposed in hydric soils 1%slope, and dry swale proposed on 4% grade) are now met. 4. Provide sections and details for each grass swale. Rev 1: Sheet 21 is a hidden detail. Please include relevant details in the block/section drawings.This block plan is sheet 5-7. Please include details for each channel on these sheets,with correct dimensions and channel linings shown. The cross section details are now included on sheet 6, 9, 12, 13, and 16. 5. Contributing drainage areas to the swales appear incorrect. The full drainage area cannot simply be split with half going to each grass swale, as much of the area appears to drain directly to the basin. Please adhere to the guidelines in the state specification; 5 acres maximum. Rev 1: Please show drainage areas that work with the final contours. Drainage areas that work with the final contours are provided. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx ® Stantec 'NW` • June 3,2015 Mr.Max Greene Page 7 of 22 Reference: Rivanna Village WPO 201400077 6. Remove the haul road which goes directly over the ditch and diversion on the east side of the basin. This is unmanageable. The haul is removed from the stormwater management plans and included on the erosion and sediment control plans with a temporary culvert. 7. Biofilters/basins should have forebays and energy dissipation/spreaders at concentrated inflows. Previously addressed. 8. The proposed grading does not appear to tie in correctly at points on this plan, and clearly goes outside limits of disturbance. Correct the grading. There are three areas where proposed roads junction with existing roadways. Tie-ins have been clarified and the limits of disturbance adjusted where needed. 9. Label and dimension the facilities on the cross sections. Previously addressed. Facility labels and dimensions have been added to the cross sections. 10. Provide riser details and dimensions on the cross-sections, and provide anti-clogging measures. Rev 1: No controls found, no computations provided.The details on sheet 19 do not agree with the sections. Riser details and dimensions are now shown on the cross sections sheets 6, 9 and 12. 11. The dam should be 3:1 or flatter on the downstream face. Dimension heights and top widths. Rev 1: The sections do not appear correct.The scales are so skewed it is hard to tell, but the cross sections are drawn at an angle to the slopes so the slopes should be flatter than the noted 2:1 or 3:1. It would be better to choose cut sections perpendicular to the dam, so that the slopes measure accurately. The sections are cut to show the outfall configuration. The slopes in the sections are now labeled as slightly flatter due to the angled orientation, and a note is added for contractor clarity. The sections are consistent with the plan view grading. Grid scales are adjusted for clarity. NOW Design with community in mind Id u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx . ® Stantec �- June 3,2015 Mr.Max Greene Page 8 of 22 Reference: Rivanna Village WPO 201400077 12. The underdrains need to be installed in the gravel layer below the media in any biofilters, and cleanout must be provided. The underdrain is proposed in the gravel layer and depicted on each respective cross section with a specific call out. A 3"pea depth layer of pea gravel is now shown around the underdrains on the bioretention cross sections. Cleanout details are provided with the cross sections. The cleanouts are labelled in plan view for clarity on the planting plans. 13. Sheet 14 standard details are confusing, as they don't match the cross-section details. If the specific sections and plans are done correctly,these generics should not be needed. Rev 1: I think it is sheet 19 now. The cross sections depict the necessary design information and are now updated to incorporate techniques previously depicted on design details. 14. On the cross-sections, remove the sub-surface EC-2 matting. This should be a surface application for stabilization. Previously addressed. Proposed EC-2 is now shown above the surface on the cross sections. 'iro, 15. Rev 1; Facility AS3B; Show the underdrain layout, so it is clear that not all pipes go through the dam, as it seems to be drawn on the cross section. None of the proposed underdrain pipes go through the dam. There is one outfall that is buried beneath the spillway as shown in plan view and in section view. The cross section and plan view are adjusted for clarity. 16. Rev 1; Facility AS3B; Revise the section to show structural fill as noted, and not rip rap. The section shows structural fill as requested. Show the emergency spillway properly. The emergency spillway is shown properly. Please be more specific if additional comments are warranted. Please revise to match controls. You cannot control storm flows in inches with a spillway of large jagged stones. Spillway linings are now updated to include matting and/or smaller diameter rock linings. Design sections are provided on cross section sheets. Design with community in mind td u:\203400205\02_correspondence\reguators\mem_on_response_alb_eng20150531.docx Stantec June 3,2015 Mr.Max Greene Page 9 of 22 Reference: Rivanna Village WPO 201400077 17. Rev 1; please include the soil specifications shown on the sections. It is standard convention throughout the State to show soil specifications on details sheets and to reference the State specifications. However, the soil specifications are shown now shown on the sections. 18. Rev. 1:the VRRM spreadsheets for this block do not have the grass swales, and still provide adequate removal. If the grades and details are no working, grass swales could be removed at this stage, and converted to conveyance channels only. Grass swales are now modified to a wet swale and a dry swale and are required for water quality compliance as designed. The design provided matches the State specifications. VRRM spreadsheets match the plans and are included in the attached stormwater calculations report. Note land cover is also summarized on sheet 23. 19. It is not clear what the outlet will look like for this facility. The section shows an outlet invert 2.5 ft below grade,which is not appropriate.The plan seems to show a rip rap apron on grade into a preserved area. The outlet for AS3a is a riser and culvert as depicted in plan view and detailed on the cross section. The invert is at existing grade and is 362 FT. The rip rap apron is 2 feet deep and in underlain by proposed non-woven geotextile filter fabric. The outfall discharges adjacent to the intermittent stream channel. The outfall from AS3d is a stabilized spillway weir depicted in cross section view. Adequacy calculations are provided in the "stormwater calculations report". 20. Rev. 1; Please address adequate channel outfalls for both basins. Adequacy calculations are provided on sheet 23 and in the attached "stormwater calculations"report. Generally, post development peak flow rates are less than pre development rates for the 1 year event. In addition, energy balance comparisons are provided at nodes S3e and S3f. 21. Please provide the routing computations for each basin to verify water elevations shown on plans.The results on sheet 26 do not provide enough detail to be independently verified. (We cannot read proprietary Pondpack files provided on the disc, unless you want to provide a copy of the software to the County. Routing results are provided for each respective Block (sheets 5, 8, 11, and 15) and summarized on sheet 22 and 23. Calculations are provided in the attached "stormwater calculations"report. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec ..� June 3,2015 Mr. Max Greene Page 10 of 22 Reference: Rivanna Village WPO 201400077 We have included the following: - Rainfall data (publically available Atlas 14 geographically specific) - Curve Number - Time of concentration - Stage Storage - Inflow and outflow hydrograph - Pre and post routed peak discharges. Note we have included the entire input and output files for the hydrologic modeling. If you need more information for independent verification, please be very specific as to what you would like as the output files are many pages. Area 2: 1. The basin contributing area is too large. Please adhere to the guidelines in the state specification. Revl: Most of the contributing area to Bs3a appears to drain naturally to Bs3b. It would make sense to make BS3b the large basin. But,with 5.15 acres total,there is no reason the haul road, as the dividing line, cannot be moved to make these drainage areas about equal and more in line with the guideline. As it is now, BS3a has most of its CDA shunted to one high „lo,, maintenance RWD and short circuiting BS3a. In addition the drainage areas appear to be in error around the periphery. The drainage area to both proposed bioretention facilities in Block B is less than 2.5 acres. 2. The wet swale does not appear to have a water source. Revl: The wet swale has been lowered. However,the wet swale still does not appear to have a source without being contiguous with the stream like adjacent wetlands. This should be revised per comment 1 to be a biofilter. The proposed BMPs in Block B (area 2) are now both biofilters as suggested, with CDA's less than 2.5 acres 3. See cross-section comments for Area 1. Most apply here. Rev1: Not addressed,this should be revised per comment 1 and previous comments. Cross sections have been adjusted per Area 1 comments including the following: - Sections re-pulled to be perpendicular and/or labelled slopes corrected to reflect/clarify skew o section for contractor. - Station and elevation data labeled at critical slope breaks - Height and width dimensioning - Depiction and labels of spillways, cleanouts and under drains on the cross sections '4... - Riser details and anti-clogging measures depicted on sections - Sections now show proposed structural fill clearly. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • ® Stantec June 3,2015 Mr. Max Greene Page 11 of 22 Nome Reference: Rivanna Village WPO 201400077 - Routed water surface elevations based on hydrologic modeling (TR-55 model included on CD and graphically depicted on sheet 26. - Soil specifications are added to the sections - The sections clearly show proposed outfall configurations. 4. Rev.1: The VRRM spreadsheets for this block do not match the plans. In addition,there are uncontrolled areas of graded slopes. All uncontrolled areas are now clearly accounted or in the VRRM computations (see summary on sheet 4 and attached "stormwater calculations"report. In addition, we have provided a graphic (sheet 23) that clearly shows the areas used within the VRRM spreadsheet, including contributing drainage areas and associated land cover. 5. Rev.1: please address adequate outfalls for both basins. In order to demonstrate adequate outfalls, a node based post development routed hydrologic analysis was completed at each outfall and compared to existing conditions. As shown on sheets 22 and 23 and supported with hydrologic modeling results (see attached "stormwater calculations"report) post development routed peak discharges are less than pre development and energy balance is achieved at the project outfalls. 6. See cross-section comments for Area 1. Most apply here. Please provide the routing computations for each basin to verify water elevations shown on plans.The results on sheet 26 do not provide enough detail to be independently verified. (we cannot read the proprietary pondpack provided on the disc, unless you want to provide a copy of the software to the county.) In order to evaluate and design the stormwater plan and associated BMPs, pre and post development hydrologic analysis was completed. As summarized on the Block specific Hydrologic Summaries (sheets 5, 8, 11, and 15) and supported with hydrologic modeling results (see attached "stormwater calculations"report) all routed water surface elevations depicted on the cross section sheets were derived from the TR-55 based hydrologic analysis. Area 3: 1. The wet swale does not appear to have a water source. BMP Es3 is now proposed as a bioretention facility. The grades are raised such that the bottom of the facility is 3 feet above the groundwater(conservatively assumed at the surface since there are adjacent wetlands/intermittent channels). 2. CS3a contributing drainage area is too large, and the other 2 channels are too narrow, and too steep in sections. Please adhere to the guidelines in the state specification. Revl. Not addressed. With the VRRM spreadsheets, it is evident that these channels are too narrow. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • 5 Stantec June 3,2015 Mr.Max Greene Page 12 of 22 Reference: Rivanna Village WPO 201400077 The drainage area to BMP CS3a is 10.05 acres, which meets State guidelines. Given the adjacent open water feature, we anticipate groundwater influence and have reduced pond removal efficiency accordingly (65%). The grass conveyance channels are now removed given the addition of the storm water drainage network in association with this phase of development. 3. Please adhere to the guidelines in the state specification for the wet pond. The wet pond does not have the minimum contributing area and appears to be excavated next to a stream. Physical testing of the groundwater table is required for design. If it interferes,the pond may not achieve adequate water quality removal according to the spec. 3:1 slopes on downstream faces must be provided uniformly. The wet pond does not meet the type 2 criteria. It must have multiple cells and wetlands. Slopes leading to the water should be 3:1 or flatter and a safety shelf provided.The geometry is not adequate for shortest flow path. Provide an emergency spillway or adequate freeboard. Rev 1. Not addressed. Plan notes and computations indicate a level 2 wet pond design under Design Specification 14. It does not meet this specification. The level #2 wet pond design is now updated to meet State specification #14. To make matters worse,the large fluctuation in water levels during smaller storm events, combined with the steep side slopes and no safety benches, could make it a safety hazard. The original design was intended to serve as a temporary BMP for preliminary grading per previous discussions. However, in association with the proposed site plan, the level #2 wet pond design is now updated to meet State specification #14. Please note that the wet pond proposed in stage 3 of the construction will eventually become the fore bay of a larger wet pond, and will be retrofitted in conjunction with phase 2 plans. With the VRRM spreadsheets provided with this revision, it is evident that it could be a level 1 design and meet requirements. A level 1 design can have a single cell with forebay, standard aquatic benches, and the shape should be redesigned to provide an adequate flow path (instead of using flimsy baffles). The original design was intended to serve as a temporary BMP for preliminary grading per previous discussions. However, in association with the proposed site plan, the level #2 wet pond design is now updated to meet State specification #14. The level 2 removal efficiency (reduced to 65%due to anticipated groundwater influence) is required for phase 1 development. Please note that the wet pond proposed in stage 3 of the construction will eventually become the fore bay of a larger wet pond, and will be retrofitted in conjunction with phase 2 plans. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • Stantec ~40s, June 3,2015 Mr. Max Greene Page 13 of 22 Now Reference: Rivanna Village WPO 201400077 4. The detail on sheet 16 appears to be for a temporary riser setup. Please correct, and add these details to the cross-section. Detail 1 on sheet 12 now shows the final riser setup. Trash racks and water quality orifices are now reflected on the cross sections. This now appears to be sheet 20. Please remove the temporary measures from the stormwater management plan. Please add permanent riser controls to the plan sections. Please show any blankets(filter diaphragms) or cradles in the cross sections. In association with the proposed site plan, the temporary measures are now removed from the stormwater plan. The permanent riser controls are now added to the cross sections on sheets 6, 9, and 12. 5. It is unclear how the planting table on sheet 10 is to be incorporated on the plan. Revl. Show a typical planted area. Planting plans have been clarified on sheets 7, 10, 14 and 17, with notes and details included Ntaw on sheet 21. 6. Please remove rip-rap rather than compacting into fill on dams, which appears as though it could leave a water conduit through the structural fill if not done very well. Rev.1: Section D-D' is still an issue,with rip rap shown at the base of the dam. However,the wet swale needs to be revised anyway. Converted sediment trap cross sections now show removal of the riprap weirs. However, in select locations, the rip rap will be re-used on the principal spillways weirs and as outfall protection. This is indicated on each respective cross section where it applies. The rip rap at the base of the dam is now removed. 7. See cross-section comments for Area 1-2. Most apply here. Rev.1: Not addressed. The cross section appears incorrect. Sheet 14 shows a wetland shelf, but the section does not. The top of the dam must be wide enough for access 10 foot typically. The two sections, of the same facility, show difference slopes on the dam. The emergency weir must be dimensioned and detailed. Cross sections have been adjusted per Area 1-2 comments including the following: - Sections re-pulled to be perpendicular and/or labelled slopes corrected to reflect/clarify skew o section for contractor. - Station and elevation data labeled at critical slope breaks - Height and width dimensioning *ow. - Depiction and labels of spillways, cleanouts and under drains on the cross sections - Riser details and anti-clogging measures depicted on sections Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • - Stantec June 3, 2015 Mr.Max Greene Page 14 of 22 Reference: Rivanna Village WPO 201400077 - Sections now show proposed structural fill clearly. - Routed water surface elevations based on hydrologic modeling (TR-55 model included on CD and graphically depicted on sheet 23. - Soil specifications are added to the sections - The sections clearly show proposed outfall configurations. 8. Rev.1: The VRRM spreadsheets for this block do not match the plans.The drainage area to the pond is listed at 3.09 acres and 9.93 on the plans. IN addition,there are uncontrolled areas of disturbance not captured by facilities which must contribute to load computations. The VRRM spreadsheets are updated for consistency. Specifically, the drainage area to the pond is 10.05 acres. The uncontrolled areas of disturbance are now included as part of the total Phosphorus load and summarized on sheet 4. 9. Rev.1 Please address adequate channel outfalls for both basins. In order to demonstrate adequate outfalls, a node based post development routed hydrologic analysis was completed at each outfall and compared to existing conditions. As shown on sheets 22 and 23 and supported with hydrologic modeling results (see attached "stormwater calculations"report) post development routed peak discharges are less than pre development and energy balance is achieved at the project outfalls. 10. Rev.1: Please provide the routing computations for each basin or pond to verify water elevations shown on the plans and required volumes.The results on sheet 26 do not provide enough detail to be independently verified. In order to evaluate channel adequacy, pre and post development hydrologic models (TR- 55 methodology) were developed for specific points of interest located primarily at BMP outfalls. All proposed BMP facilities are routed with the proposed storage volumes and spillway configuration depicted on the plans, designed to attenuate post development discharges to pre development levels. In addition, the energy balance method was utilized to evaluate main discharge points. The hydrologic analysis is summarized on sheets 22 and 23, and an associated "stormwater calculations"report is provided to facilitate review. Area 4: 1. Please do not include off-site areas which can be diverted. These areas may change in the future, affecting results. Rev.1: HS3a still shows a large portion of its contributing area on the fire station property. The parking lot must be shown as impervious in the computations if this is to remain. Drainage area HS3a has includes a portion of the fire station property and the BMP is sized to accommodate this flow. The VRRM calculations are now updated to reflect the treatment of this area. While it does not contribute to load removal required, it is credited. If the land use changes on that parcel, it is our understanding that stormwater management %%or would accompany that change. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • . ® Stantec ..r .are June 3, 2015 Mr.Max Greene Page 15 of 22 Reference: Rivanna Village WPO 201400077 2. Please see comments for areas 1-3, many apply here. Rev.1 See below. 3. Rev.1.The wet swale without a water source is not a viable option here. Please change to a biofilter. The proposed wet swale is located in hydric soils. 4. Rev.1: Show cleanouts and layout of underdrains, as the sections seem to indicate all drain through the dam. Only 1 underdrain will go through the dam per each bioretention facility. The cross sections now clearly show the one drainage point, generally aligned with the spillway. 5. Rev.1:The rip rap shown through the dam is still an issue, as it is lower than the biofilters. In addition,the outlet elevation of the flows cannot be controlled in inches with rip rap sizes much larger. ,am, The rip rap in the dam is now removed from the sections. The proposed spillways are now revised to include cobble lined or vegetated spillways which are specified in section and tabular view on each applicable cross section. 6. Rev.1: The VRRM spreadsheets for this block must account for the disturbed areas that are going untreated. The VRRM spreadsheets clearly indicate that uncontrolled areas are accounted for in the load removal requirement. The load generated from uncontrolled areas that is required removal is 2.48 lbs TP. This load is treated elsewhere ono the site so that the site as a whole meets water quality criteria. 7. Please address adequate outfall for both basins. In order to demonstrate adequate outfalls, a node based post development routed hydrologic analysis was completed at each outfall and compared to existing conditions. As shown on sheets 22 and 23 and supported with hydrologic modeling results (see attached "stormwater calculations"report) post development routed peak discharges are less than pre development and energy balance is achieved at the project outfalls. 8. Please provide the routing computations for each basin to verify water elevations shown on the pans and required volumes. In order to evaluate channel adequacy, pre and post development hydrologic models (TR- *ow 55 methodology) were developed for specific points of interest located primarily at BMP outfalls. All proposed BMP facilities are routed with the proposed storage volumes and Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • 5 Stantec NNW "' June 3, 2015 Mr.Max Greene Page 16 of 22 Reference: Rivanna Village WPO 201400077 spillway configuration depicted on the plans, designed to attenuate post development discharges to pre development levels. In addition, the energy balance method was utilized to evaluate main discharge points. The hydrologic analysis is summarized on sheets 22 and 23, and an associated "stormwater calculations"report is provided to facilitate review. C. Erosion and Sediment Control Plan (ESCP) Max Greene's comments Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is disapproved, and the reasons are provided in the comments below.The erosion control plan content requirements can be found in County Code section 17-402. 1. Match lines would be helpful to the inspector/contractor. Please note there is a sheet index (3 of 25) which can be used as reference for the layout of subsequent sheets. In addition, sheet references and match lines are now incorporated throughout the plan set for orientation. Comment Addressed. 2. All proposed grade lines will be within the limits of disturbance. There are a few grading requirements where proposed roads junction with existing roadways. Tie-ins have been clarified and the limits of disturbance adjusted where needed. Rev.1: Comment does not appear addressed.There are lines outside of the LOD on sheets 5 and 7 of 26 on the SWM plans. The LOD is now revised per the site plan grading, and all locations where land disturbance is proposed are now within the LOD. Specifically, LOD updates are included on sheets 4, 7, 8, 9, and 10. 3. There appears to be a basin proposed on sheet 8 of 9 on the bottom of the page across from the Glenmore entrance. There is no outlet for this sump area. Please explain. Sediment basin BS1a (stage 1) will be converted to BS2a (stage 2) : Primary outfall is a 36" diameter riser with 18" outlet barrel. The outlet is covered by cross section C-C' on sheet 10A and can be seen in plan view on sheet 10. Sizing calculations are provided on sheet 9 and 10. Rev.1: Sheet 8 of 19 appears to show the need to fill into the proposed tree protection area or create a ponding area that could lead to erosion across the fill area into the basin. This area is protected by the basin and should be corrected with the site plan grading. Acknowledged. The site plan grading is now adjusted to address this ponding issue and the drop inlets are now included in the stage 2 erosion and sediment control plan. Design with community in mind id u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • ® Stantec • June 3,2015 Mr. Max Greene Page 17 of 22 Reference: Rivanna Village WPO 201400077 4. Silt fence is shown very close to the edge of stream. Please place a note on the plan sheets "Silt Fence and Diversions will be kept a minimum 5' from top of bank. If a discrepancy occurs in the field for silt fence and/or diversion installation then the plans will be amended to reflect the changes required to keep the silt fence and or Diversion a minimum 5' from top of stream bank." Note has been added to sheets 5 through 13. Rev.1: Comment appears adequately addressed at this time. 5. Silt fence should follow contours. Low points in silt fence are pounding areas and tend to fail from excessive collection of water and silt.Traps may be required "in field" should these areas show potential for failure. Project delay could occur if a new plan is required for field adjustments. "Operator" will need to be proactive to prevent delays. Agreed, field coordination will be a priority. Rev.1: Low points and pockets are still proposed in the silt fence alignment with this submittal. Potential fines and delays may occur from run off producing storm events. This office recommends correcting silt fence alignments t7o remove low pockets. Internal silt fence parallel to proposed roadways is now removed in association with the site plan submittal. Generally perimeter silt fence does not have the low pockets referenced above. Specific corrections were made on sheets 8 and 9. 6. Silt fence installed down a slope is essentially a diversion and tend to cause erosive velocities and blow-outs in low points of silt fence. If silt fence must be utilized down slopes then check dams should be installed to slow the velocities and to force the stormwater through the filter fabric. (See note#3) Diversions are recommended for down slope installations. Silt fence is now only shown parallel to slopes and check dams are added as recommended. Where feasible, diversions are now proposed in lieu of silt fence (i.e. 7 of 19) Rev.1: No comment 7. Temporary Stream Crossings do not appear to be adequately addressed. a. Please Refer to VESCH Std. &Spec. 3.24 Temporary Stream Crossing (SC) Design Criteria Page III-221 note d for diversion requirements. b. Please add VESCH Std. & Spec. 3.24 Temporary Stream Crossing (SC) Construction Specifications "Temporary Bridge Crossing" to the plan. A temporary stream crossing detail is provided on detail 4 of sheet 14. VESCH Std. and Spec. 3.24 have been added to the E&S notes on sheet 18. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 18 of 22 Nom., Reference: Rivanna Village WPO 201400077 Rev.1: Detail 14 on sheet 19 appears adequate at this time. 8. Please place a note on the plans: "Silt fence will NOT be installed across the outlet of any stormwater detention structure. Pipe Outlet: Silt fence shall be installed over the outlet of pipes. Stone Weir: Silt fence shall be turned up slope on either side of weir outlet." Note has been added to sheets 5 through 13. Rev.1:Comment appears adequately addressed at this time. 9. Limits of disturbances appear to include sanitary sewer installation limits. Early grading does not allow for the installation of sanitary sewer lines or other hardscape. Please remove the limits of construction for infrastructure such as sanitary or storm sewer line installation. Infrastructure plans are to be submitted under separate cover by Alan Franklin PE, LLC. As such, this plan addresses disturbance associated with the infrastructure plans. Rev.1: Clearing for the sanitary sewer is not approved with this plan. Proposed clearing limits associated with the sanitary sewer are now adjusted in association with the site plan submittal. Utility plans are now included by Alan Franklin under separate cover. 10. Proposed silt fence appears to have an existing swale intersecting perpendicular to the silt fence. The silt fence directs the storm flows to the low point in the corner adjacent to the wetland area. A diversion and trap should be shown in this location instead of silt fence. Assuming this refers to Block A, a sediment trap (AS 1A-2) is now depicted in stage 1 at the low point that eventually intersections with the proposed diversion swale. Please note that as soon as fill is placed in Block A, and the site graded as proposed, this low spot will no longer exist. Rev.1: This may remain a problem area on sheet 10 of 19. Sheet 10 of 19 depicts a sediment trap during stage 1 erosion and sediment control that will be removed when the site is graded as referenced above. The low spot is converted to a wet swale with positive slope towards a BMP as depicted in the storm water management plan. 11. Sediment basin AS1a is missing the outlet structure and riser pipe on plan view. (Page 7 of 19) Riser and outlet barrel are now shown and labeled accordingly. Rev.1:Comment appears adequately addressed at this time. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 19 of 22 Reference: Rivanna Village WPO 201400077 12. Proposed diversion AS1 a appears to have an existing swale intersecting perpendicular to the diversion and is also the low point of the diversion. Stormwater will not make it to the basin as shown until the fill material is placed. Please show a temporary trap in this location. (Pages 7 of 19) A temporary sediment trap has been added at this location. Rev.1:Comment appears adequately addressed at this time. 13. Silt fence and fill material appear to encroach on existing swale at the top of page 10 of 19. Swales should not be blocked with silt fence. A sediment trap is recommended in this area; otherwise, pull the proposed grading toe of slope back to top of 2 year storm elevation for swale to prevent erosive undermining of silt fence. Proposed grading has been adjusted. Rev.1:Comment appears adequately addressed at this time. 14. Erosion control measures are not shown for East side of sediment trap BS2b along limits of disturbance. (page 10 of 19) Silt fence has been extended. Rev.1: Silt fence does not meet the minimum requirements of std. and spec 3.05.. The length of the flow path appears to exceed the requirements. The proposed silt fence was re-evaluated and the maximum flow length to the silt fence is 100 feet as depicted on sheet 12. In select locations, we have now added a diversion to re-direct sheet flows longer than 100 feet. The contributing watersheds are now directed to ES 1 and ES2. 15. Silt fences and diversions on Stage 2 plans sheets have all most disappeared from view like the existing contours. Please make sure the shading of E&SC measures that are to remain are clearly recognized on the plan sheets. All E&SC measures (shown in black) shown are to remain until the site is stabilized then will be removed upon completion and stabilization. Rev.1: existing contour lines are still too light to follow. Please darken the existing contour lines. The existing contour lines are now darker and dashed. 16. Proposed travel ways that cross over a diversion will require a pipe or other State approved method designed for the 10 year storm event. Design with community in mind Id u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx ' ® Stantec June 3,2015 Mr.Max Greene Page 20 of 22 Reference: Rivanna Village WPO 201400077 A pipe has been sized and specified in the plan set for the Block A diversion crossing. The diversion crossings shown for Block B are right-of-way diversions, which will be removed and replaced with appropriate grading in stage 3 as depicted on the stormwater plans.. Rev.1: See comment#21 below. 17.) Proposed grading is shown under and beneath the silt fence on sheet 8 of 19. Please move the silt fence to capture the proposed disturbance. The silt fence is adjusted on sheet 7. 18.) Existing conditions/topography is not legible on several of the plan sheets. Please make the plans legible. Adequate review was not possible for vague pages. Existing contours are now darker for clarity. 19.) This office recommends removing the internal silt fence from the construction site. The internal silt is removed. Nit,,,. 20.) Sheet 8 does not appear to match sheet 10 and sheet 10 does not appear to match up with sheet 12 and sheet 12 does not appear to match up to sheet 13 etc. Please make plans match/overlay. Matchlines are now adjusted sheet layouts updated accordingly. 21.)The right of way diversions appear to be labelled (DV) instead of(RWD). Right of way diversion labels are updated on sheets 7 and 9. 22.) Please label all baffles in basins. The baffles are now labelled and a detail is provided. Additional comments and/or conditions may be forthcoming due to requested changes to plan. The VSMP permit application and all plans may be resubmitted for approval when all comments have been satisfactorily addressed. For re-submittals please provide 2 copies of the complete permit package with a completed application form. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • ® Stantec June 3,2015 Mr. Max Greene Page 21 of 22 Nar Reference: Rivanna Village WPO 201400077 Engineering plan review staffs are available from 2-4 PM on Thursdays, should you require a meeting to discuss this review. Process; After approval, plans will need to bonded.The bonding process is begun by submitting a bond estimate request form and fee to the Department of Community Development. One of the plan reviewers will prepare estimates and check parcel and easement information based on the approved plans. The County's Management Analyst will prepare bond agreement forms,which will need to be completed by the owner and submitted along with cash, certificates or sureties for the amounts specified.The agreements will need to be approved and signed by the County Attorney and County Engineer. This may take 2-4 weeks to obtain all the correct signatures and forms. Stormwater Management Facilities Maintenance agreements will also need to be completed and recorded. The County's Management Analyst or other staff will prepare the forms and check for ownership and signature information.The completed forms will need to be submitted along with court recording fees. After bonding and agreements are complete, county staff will need to enter project information in a DEQ database for state application processing. DEQ will review the application information based on local VSMP authority approval. At this time, the DEQ portion of the application fees will need to be paid directly to the state. For fastest processing, this is done electronically with the emails %.•, provided on the application. DEQ should notify applicants with instructions on how to pay fees. When DEQ approves the application, they will issue a permit coverage letter. This should be copied to the county. After DEQ coverage is issued, via the coverage letter, the County can hold a pre-construction conference. Applicants will need to complete the request for a pre-construction conference form, and pay the remainder of the application fee. The form identifies the contractor and responsible land disturber, and the fee remaining to be paid.This will be checked by county staff, and upon approval, a pre-construction conference will be scheduled with the County inspector. At the pre- construction conference,should everything proceed satisfactorily, a joint VSMP and grading permit will be issued by the County so that work may begin. County forms can be found on the county website forms center under engineering; http://www.albemarle.org/deptforms.asp?department=cdengwpo Stantec Consulting Services Inc. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • Stantec June 3,2015 Mr. Max Greene Page 22 of 22 Reference: Rivanna Village WPO 201400077 Scott Blossom Senior Engineer Phone: (757) 220-6869 Fax: (757) 229-4507 scott.blossom @stantec.com Attachment: E&S Plans, Interim Stormwater Plans, VRRM Spreadsheet, Hydrology Calculations, SWPPP, Maintenance Agreements, VSMP Application, Bond request c. ck, is No- Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx tiov �, � COUNTY OF ALBEMARLE Department of Community Development S'4411111W7 c ib 401 McIntire Road,North Wing Charlottesville,Virginia 22902-4596 4,IFfifk f` Tel.(434)296-5832 • Fax(434)972-4126 Stormwater Pollution Prevention Plan (SWPPP) For Construction Activities At: Project Name: Rivanna Village Address: Rivanna Village LLC Mr. Andrew Boninti 314 East Water Street Charlottesville, VA 22902 Prepared by: Name: Stantec Consulting Services Inc Prepared for: Name: Rivanna Village LLC SWPPP Preparation Date: February 10, 2015, Revised June 1, 2015 (This document is to be made publicly available according to 9VAC25-880-70, Part II, section D) Issued— 10/2014 Stormwater Pollution Prevention Plan (SWPPP) Albemarle County Stantec Transmittal Stantec Consulting Services Inc. 5209 Center Street, Williamsburg,VA 23188 To: Mr. Andrew Boninti From: Scott C. Blossom, P.E. Company: Rivanna Village LLC ❑ For Your Information Address: 314 East Water Street 1:1 For Your Approval Charlottesville VA 22902 ❑ For Your Review Phone: 434-284-4006 As Requested Date: June 3, 2015 File: 203400205 Delivery: FedEx Reference: Rivanna Village Attachment: Copies Doc Date Pages Description 2 6/3/15 23 Erosion and Sediment Control Plan-Rivanna Village- Phase 1 -Stage 1 &2 2 6/3/15 23 Stormwater Management Plan- Rivanna Village-Phase 1 1 6/1/15 83 Stormwater Pollution Prevention Plan (SWPPP) 1 N/A 2 VSMP Application for Albemarle County 2 N/A N/A CDs-Submittal and Calculations 2 6/3/15 22 Annotated comment response to Albemarle County Enclosed are the plans and associated documents for your review, signature, and submittal to Albemarle County. Stantec Consulting Services Inc. Scott Blossom Senior Engineer Phone: (757) 220-6869 Fax: (757) 229-4507 Design with community in mind td\\us 1265-r01\shared_projects\203400205\03_data\cgpswppp\trn_swppp_and_plan_submittal_20150602.docx Stantec Memo To: Mr. Max Greene From: Scott C. Blossom P.E. Rivanna Village Phase 1 Williamsburg, VA 23188 File: Rivanna Village WPO 201400077 Date: June 3, 2015 Dear Mr. Greene, This annotated comment response is provided to address County comments received on 3/11/2015. Responses are listed in italics below for your review in coordination with the plan sets. We appreciate your time and consideration in the interest of moving for to plan approval and issuance of the VSMP permit (attached). VSMP Permit plan review This submittal is provided in accordance with VSMP application content requirements found in County Code section 17-401. A. Stormwater Pollution Prevention Plan (SWPPP) The SWPPP content requirements can be found in County Code section 17-405. A SWPPP must contain (1) a PPP, (2) an ESCP, (3) a SWMP, and (4) any TMDL measures necessary. 1. The registration statement appears to be in error.The land development is listed as 94.66 acres and disturbed area as 40.93. The plans submitted show 58.8 acres "project limits" and 36.5 acres disturbed. The registrations statement and SWPPP will only be permitted for areas with approved plans. Previously addressed. LOD =32.42 acres. 2. Plans included with the SWPPP must be approved plans.The SWPPP includes a "Preliminary Stormwater Concept" plan.This does not appear to have been included with ZMA20 1 3000 1 2 or earlier plans, and so does not appear to have any official standing. It should not be part of the SWPPP. Previously addressed. 3. Include an explanation of the staging and phasing in the SWPPP.The concept of a stage 3, in which the ultimate development is not considered per 9VAC25-870-72, presents some difficulties, and we will have to run this by DEQ personnel for guidance. The concept of a stage 3 interim plan set is now removed from the plan set. A two stage erosion and sediment control plan and stormwater plan is now included - Stage 1 erosion and sediment control: construction entrance & perimeter controls - Stage 2 erosion and sediment control: sediment traps and basins - Stormwater plan: final stabilization and BMPs Nviow Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 2 of 22 sr.► Reference: Rivanna Village WPO 201400077 4. Please follow the standard Albemarle County SWPPP template. Including more is fine, but it should at least have the template items. The SWPPP is now revised on the Albemarle County template. A. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17-404. Previously addressed. B. Stormwater Management Plan (SWMP) The stormwater management plan content is designed in accordance with the specifications found in County Code section 17-403. 1. Provide the VRRM spreadsheets for each section of the site. A full review could not be completed, as these were not included in the submittal. Please ensure that the areas used in the computation, both for drainage to each facility, and for disturbed area load computations turf,forest, and impervious, appear on a plan sheet or map. Rev 1:The spreadsheets were received. Thank you. The areas used in the spreadsheet computations were not received. The areas are clearly shown on plan sheets 22 and 23. As an example, for AS3A,the 1.34 acre and 6.84 acre areas in the spreadsheet are not shown on sheet 4 or 5. Instead, 1.14, 6.2 and 0.84 are shown on these sheets.. AS3A is separated into three cells and the two additional swales are vegetated swales per State guidance. The drainage area to AS3A is now subdivided. Two drainage areas (AS3c-1, 2) drain though a wet swale then to the multi cell bioretention cell. One drainage area (AS3b) drains through a dry swale then to the multi cell biorenetion swale. Three other drainage areas (AS3a-1,2,3) drain to individual cells. The subdrainage areas are all less than 2.5 acres, with the exception of cell AS3a-2, which receives sub watersheds totaling 2.80 acres. Approximately 40% of this drainage area is open space or vegetated buffer. These drainage areas now match with the VRRM spreadsheets and summaries provided in the "Stormwater calculations"report incorporated by reference into the plans. Note that the areas presented on the VRRM spreadsheets are also shown on sheets 22 and 23 of the plan set. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr.Max Greene Page 3 of 22 i"" Reference: Rivanna Village WPO 201400077 Also,the spreadsheet indicates only turf and forested areas,when the plan clearly shows part of Glenmore Way in the drainage area. This portion of Glenmore Way is now included in the spreadsheets, and is within DA AS3a- 1,2,3 and AS3c-1,2. 2. Where preserved/forested areas are credited in the computations,there must be temporary physical barriers and permanent easement measures provided to ensure they remain undisturbed. Rev 1: Not addressed. There are no barriers on the plan, and no easements,and no definitive way of measuring the preserved areas to assure they remain undisturbed. Limits of disturbance are not enough, and plastic safety fence is insufficient. Thin strips of wooded area are unlikely to be viable at all. Wooded areas accounted for in the VRRM calculations are now depicted clearly on the plans as the area that was preferred (70 foot width along Glenmore Way) as a component of the re-zoning case (see sheets 4,5,8 and 27). The areas will be preserved and enhanced with supplemental plantings to maintain a vegetated buffer that is protected by easement per the agreement set forth in the proffer. This area will be clearly marked with appropriate signage. 3. The "project limits" shown on plans are confusing. It is unclear what they represent, as the limits of disturbance, parcel boundaries, and drainage areas appear to provide what is necessary. Rev 1: Please remove the project limits. Most plans use a bold line for parcel boundaries. The overall project limits are now removed, and the Phase 1 Limits of disturbance are now the only project area shown. The parcel lines are now bolder. 4. The stormwater plan seems to have temporary measures still shown, like construction entrances,temporary stream crossings, silt fence, haul roads, and diversions. Notes even indicate temporary perimeter measures to remain.Temporary measures should be finished, removed, and the site fully stabilized/vegetated for the stormwater management phase. Grading and formal channels should be provided to direct drainage if necessary rather than temporary diversions. Rev 1: Please remove temporary construction (erosion control, haul roads etc) measures on the stormwater management plan. Temporary measures are now removed from the stormmwater management plan. 5. Uncollected areas will need to be accounted for in the load computations. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 4 of 22 Now Reference: Rivanna Village WPO 201400077 Uncollected areas are included in the load computations (see summary provided on sheet 4 and attached "stormwater calculations"report) and a shaded hatch is now added to sheet 23 to indicate these areas. 6. Provide planting plans, or typical areas to be repeated when planting within each facility. It is unclear how the tables are to be implemented. The planting plans are now updated with quantities and species. See sheets 7, 10, 14, and 17. 7. Keep to standard engineer scales. (i.e. not 70) Standard engineer scales are now included in the plan set as requested. The only sheets that were remaining at 150 and 250 were the cover and the hydrology summary, neither of which is provided for construction layout nor need scaled. However, we have now adjusted those sheets to standard engineer scales. The site seems to be divided into four main areas, outlined in the graphic below, and only limited detailed review could be provided without the load and load area computations. Facility sizing and removals could not be checked at this time. Please note that all sizing information is provided on the sidebar of each plan and profile sheet, corresponding to the facility sizing. In addition, an overall summary was/is included on the master plan sidebar(sheet 4). This information was included on the plan set with the original submittal and is still included/updated as requested. Load computations are clearly provided for all drainage areas within the project limits, and correspond with the aforementioned VRRM spreadsheets. Graphical summary of land cover assumptions is provided on sheet 23. Load and load area computation summaries are provided on sheet 4 and in the Virginia Runoff Reduction spreadsheets included in the "stormwater calculations"report. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx ® Stantec June 3, 2015 Mr.Max Greene Page 5 of 22 No"' Reference: Rivanna Village WPO 201400077 .. is j f t '� j ' t t�«1e , t ':,\.%,..";9(...c,,, 5. y v. •`} .,. . N,,,, cv ( ' 3 ..z. 'V r //- - r - „,,,,y- -., -\ , , }, k ` 4 f e t .. ! I ; t ♦ y' ; % le ' .. i , , gel '” '_ v "mot -', 1 1 1 + 1 5 Area 1: 1. The wet swale needs a water source for the new wetland.The existing wetlands have the stream.The proposed wet swale appears to sit 6 feet above on constructed fill. Rev l: Previously addressed. Changed to bioretention basin AS3B. 2. Bioretention basins have a maximum drainage area of 2.5 acres. Please adhere to the guidelines in the state specification.The proposed bioretention has 8 acres drainage too it, which is too large. a.) AS3A is separated into three cells and the two additional swales are vegetated swales per State guidance. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx COStantec June 3,2015 Mr. Max Greene Page 6 of 22 Now, Reference: Rivanna Village WPO 201400077 b.) The drainage area to AS3A is now subdivided. Two drainage areas (AS3c-1, 2) drain though a wet swale then to the multi cell bioretention cell. One drainage area (AS3b) drains through a dry swale then to the multi cell biorenetion swale. Three other drainage areas (AS30-1,2,3) drain to individual cells. c.) The subdrainage areas are all less than 2.5 acres, with the exception of cell AS3a-2, which receives sub watersheds totaling 2.80 acres. Approximately 40%of this drainage area is open space or vegetated buffer. d.) These drainage areas now match with the VRRM spreadsheets and summaries provided in the "Storm water calculations"report incorporated by reference into the plans. Note that the areas presented on the VRRM spreadsheets are also shown on sheets 22 and 23 of the plan set. e.) The bioretention cell is designed with an adequate spillway. 3. Grass channel AS3a-1 is too steep and not wide enough. Please adhere to the guidelines in the state specification. Proposed grading now maintains equal to or less than 4%slope for the entire length of swales AS3b and AS3c. The bottom width of calculations and proposed grading is now 4 ft. The both each swale (wet swale proposed in hydric soils l%slope, and dry swale proposed on 4% grade) are now met. 4. Provide sections and details for each grass swale. Rev 1: Sheet 21 is a hidden detail. Please include relevant details in the block/section drawings.This block plan is sheet 5-7. Please include details for each channel on these sheets,with correct dimensions and channel linings shown. The cross section details are now included on sheet 6, 9, 12, 13, and 16. 5. Contributing drainage areas to the swales appear incorrect. The full drainage area cannot simply be split with half going to each grass swale, as much of the area appears to drain directly to the basin. Please adhere to the guidelines in the state specification; 5 acres maximum. Rev 1: Please show drainage areas that work with the final contours. Drainage areas that work with the final contours are provided. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 7 of 22 Now- Reference: Rivanna Village WPO 201400077 6. Remove the haul road which goes directly over the ditch and diversion on the east side of the basin. This is unmanageable. The haul is removed from the storm water management plans and included on the erosion and sediment control plans with a temporary culvert. 7. Biofilters/basins should have forebays and energy dissipation/spreaders at concentrated inflows. Previously addressed. 8. The proposed grading does not appear to tie in correctly at points on this plan, and clearly goes outside limits of disturbance. Correct the grading. There are three areas where proposed roads junction with existing roadways. Tie-ins have been clarified and the limits of disturbance adjusted where needed. 9. Label and dimension the facilities on the cross sections. Previously addressed. Facility labels and dimensions have been added to the cross sections. 10. Provide riser details and dimensions on the cross-sections, and provide anti-clogging measures. Rev 1: No controls found, no computations provided.The details on sheet 19 do not agree with the sections. Riser details and dimensions are now shown on the cross sections sheets 6, 9 and 12. 11. The dam should be 3:1 or flatter on the downstream face. Dimension heights and top widths. Rev 1: The sections do not appear correct.The scales are so skewed it is hard to tell, but the cross sections are drawn at an angle to the slopes so the slopes should be flatter than the noted 2:1 or 3:1. It would be better to choose cut sections perpendicular to the dam, so that the slopes measure accurately. The sections are cut to show the outfall configuration. The slopes in the sections are now labeled as slightly flatter due to the angled orientation, and a note is added for contractor clarity. The sections are consistent with the plan view grading. Grid scales are adjusted for clarity. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr.Max Greene Page 8 of 22 `w Reference: Rivanna Village WPO 201400077 12. The underdrains need to be installed in the gravel layer below the media in any biofilters, and cleanout must be provided. The underdrain is proposed in the gravel layer and depicted on each respective cross section with a specific call out. A 3"pea depth layer of pea gravel is now shown around the underdrains on the bioretention cross sections. Cleanout details are provided with the cross sections. The cleanouts are labelled in plan view for clarity on the planting plans. 13. Sheet 14 standard details are confusing, as they don't match the cross-section details. If the specific sections and plans are done correctly,these generics should not be needed. Rev 1: I think it is sheet 19 now. The cross sections depict the necessary design information and are now updated to incorporate techniques previously depicted on design details. 14. On the cross-sections, remove the sub-surface EC-2 matting.This should be a surface application for stabilization. Previously addressed. Proposed EC-2 is now shown above the surface on the cross sections. 15. Rev 1; Facility AS3B; Show the underdrain layout, so it is clear that not all pipes go through the dam, as it seems to be drawn on the cross section. None of the proposed underdrain pipes go through the dam. There is one outfall that is buried beneath the spillway as shown in plan view and in section view. The cross section and plan view are adjusted for clarity. 16. Rev 1; Facility AS3B; Revise the section to show structural fill as noted, and not rip rap. The section shows structural fill as requested. Show the emergency spillway properly. The emergency spillway is shown properly. Please be more specific if additional comments are warranted. Please revise to match controls. You cannot control storm flows in inches with a spillway of large jagged stones. Spillway linings are now updated to include matting and/or smaller diameter rock linings. Design sections are provided on cross section sheets. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 9 of 22 ``"' Reference: Rivanna Village WPO 201400077 17. Rev 1; please include the soil specifications shown on the sections. It is standard convention throughout the State to show soil specifications on details sheets and to reference the State specifications. However, the soil specifications are shown now shown on the sections. 18. Rev. 1:the VRRM spreadsheets for this block do not have the grass swales, and still provide adequate removal. If the grades and details are no working, grass swales could be removed at this stage, and converted to conveyance channels only. Grass swales are now modified to a wet swale and a dry swale and are required for water quality compliance as designed. The design provided matches the State specifications. VRRM spreadsheets match the plans and are included in the attached stormwater calculations report. Note land cover is also summarized on sheet 23. 19. It is not clear what the outlet will look like for this facility. The section shows an outlet invert 2.5 ft below grade,which is not appropriate.The plan seems to show a rip rap apron on grade into a preserved area. The outlet for AS3a is a riser and culvert as depicted in plan view and detailed on the cross section. The invert is at existing grade and is 362 FT. The rip rap apron is 2 feet deep and in underlain by proposed non-woven geotextile filter fabric. The outfall discharges adjacent to the intermittent stream channel. The outfall from AS3d is a stabilized spillway weir depicted in cross section view. Adequacy calculations are provided in the "stormwater calculations report". 20. Rev. 1; Please address adequate channel ouffalls for both basins. Adequacy calculations are provided on sheet 23 and in the attached "stormwater calculations"report. Generally, post development peak flow rates are less than pre development rates for the 1 year event. In addition, energy balance comparisons are provided at nodes Sae and S3f. 21. Please provide the routing computations for each basin to verify water elevations shown on plans.The results on sheet 26 do not provide enough detail to be independently verified. (We cannot read proprietary Pondpack files provided on the disc, unless you want to provide a copy of the software to the County. Routing results are provided for each respective Block (sheets 5, 8, 11, and 15) and summarized on sheet 22 and 23. Calculations are provided in the attached "stormwater calculations"report. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3, 2015 Mr.Max Greene Page 10 of 22 Reference: Rivanna Village WPO 201400077 We have included the following: - Rainfall data (publically available Atlas 14 geographically specific) - Curve Number - Time of concentration - Stage Storage - Inflow and outflow hydrograph - Pre and post routed peak discharges. Note we have included the entire input and output files for the hydrologic modeling. If you need more information for independent verification, please be very specific as to what you would like as the output files are many pages. Area 2: 1. The basin contributing area is too large. Please adhere to the guidelines in the state specification. Revl: Most of the contributing area to Bs3a appears to drain naturally to Bs3b. It would make sense to make BS3b the large basin. But,with 5.15 acres total,there is no reason the haul road, as the dividing line, cannot be moved to make these drainage areas about equal and more in line with the guideline. As it is now, BS3a has most of its CDA shunted to one high 440, maintenance RWD and short circuiting BS3a. In addition the drainage areas appear to be in error around the periphery. The drainage area to both proposed bioretention facilities in Block B is less than 2.5 acres. 2. The wet swale does not appear to have a water source. Revl: The wet swale has been lowered. However,the wet swale still does not appear to have a source without being contiguous with the stream like adjacent wetlands. This should be revised per comment 1 to be a biofilter. The proposed BMPs in Block B (area 2) are now both biofilters as suggested, with CDA's less than 2.5 acres 3. See cross-section comments for Area 1. Most apply here. Revl: Not addressed,this should be revised per comment 1 and previous comments. Cross sections have been adjusted per Area I comments including the following: - Sections re-pulled to be perpendicular and/or labelled slopes corrected to reflect/clarify skew o section for contractor. - Station and elevation data labeled at critical slope breaks - Height and width dimensioning - Depiction and labels of spillways, cleanouts and under drains on the cross sections Nom - Riser details and anti-clogging measures depicted on sections - Sections now show proposed structural fill clearly. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 11 of 22 Reference: Rivanna Village WPO 201400077 - Routed water surface elevations based on hydrologic modeling (TR-55 model included on CD and graphically depicted on sheet 26. - Soil specifications are added to the sections - The sections clearly show proposed outfall configurations. 4. Rev.1:The VRRM spreadsheets for this block do not match the plans. In addition,there are uncontrolled areas of graded slopes. All uncontrolled areas are now clearly accounted or in the VRRM computations (see summary on sheet 4 and attached "stormwater calculations"report. In addition, we have provided a graphic (sheet 23) that clearly shows the areas used within the VRRM spreadsheet, including contributing drainage areas and associated land cover. 5. Rev.1: please address adequate outfalls for both basins. In order to demonstrate adequate outfalls, a node based post development routed hydrologic analysis was completed at each outfall and compared to existing conditions. As shown on sheets 22 and 23 and supported with hydrologic modeling results (see attached "stormwater calculations"report) post development routed peak discharges are less than pre development and energy balance is achieved at the project outfalls. 6. See cross-section comments for Area 1. Most apply here. Please provide the routing computations for each basin to verify water elevations shown on plans.The results on sheet 26 do not provide enough detail to be independently verified. (we cannot read the proprietary pondpack provided on the disc, unless you want to provide a copy of the software to the county.) In order to evaluate and design the stormwater plan and associated BMPs, pre and post development hydrologic analysis was completed. As summarized on the Block specific Hydrologic Summaries (sheets 5, 8, 11, and 15) and supported with hydrologic modeling results (see attached "stormwater calculations"report) all routed water surface elevations depicted on the cross section sheets were derived from the TR-55 based hydrologic analysis. Area 3: 1. The wet swale does not appear to have a water source. BMP Es3 is now proposed as a bioretention facility. The grades are raised such that the bottom of the facility is 3 feet above the groundwater(conservatively assumed at the surface since there are adjacent wetlands/intermittent channels). 2. CS3a contributing drainage area is too large, and the other 2 channels are too narrow, and too steep in sections. Please adhere to the guidelines in the state specification. Rev1. Not addressed. With the VRRM spreadsheets, it is evident that these channels are too narrow. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 12 of 22 Now- Reference: Rivanna Village WPO 201400077 The drainage area to BMP CS3a is 10.05 acres, which meets State guidelines. Given the adjacent open water feature, we anticipate groundwater influence and have reduced pond removal efficiency accordingly (65%). The grass conveyance channels are now removed given the addition of the storm water drainage network in association with this phase of development. 3. Please adhere to the guidelines in the state specification for the wet pond. The wet pond does not have the minimum contributing area and appears to be excavated next to a stream. Physical testing of the groundwater table is required for design. If it interferes,the pond may not achieve adequate water quality removal according to the spec. 3:1 slopes on downstream faces must be provided uniformly. The wet pond does not meet the type 2 criteria. It must have multiple cells and wetlands. Slopes leading to the water should be 3:1 or flatter and a safety shelf provided. The geometry is not adequate for shortest flow path. Provide an emergency spillway or adequate freeboard. Rev 1. Not addressed. Plan notes and computations indicate a level 2 wet pond design under Design Specification 14. It does not meet this specification. The level #2 wet pond design is now updated to meet State specification #14. To make matters worse, the large fluctuation in water levels during smaller storm events, combined with the steep side slopes and no safety benches, could make it a safety hazard. The original design was intended to serve as a temporary BMP for preliminary grading per previous discussions. However, in association with the proposed site plan, the level #2 wet pond design is now updated to meet State specification #14. Please note that the wet pond proposed in stage 3 of the construction will eventually become the fore bay of a larger wet pond, and will be retrofitted in conjunction with phase 2 plans. With the VRRM spreadsheets provided with this revision, it is evident that it could be a level 1 design and meet requirements. A level 1 design can have a single cell with forebay, standard aquatic benches, and the shape should be redesigned to provide an adequate flow path (instead of using flimsy baffles). The original design was intended to serve as a temporary BMP for preliminary grading per previous discussions. However, in association with the proposed site plan, the level #2 wet pond design is now updated to meet State specification #14. The level 2 removal efficiency (reduced to 65%due to anticipated groundwater influence) is required for phase 1 development. Please note that the wet pond proposed in stage 3 of the construction will eventually become the fore bay of a larger wet pond, and will be retrofitted in conjunction with phase 2 plans. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_aib_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 13 of 22 Reference: Rivanna Village WPO 201400077 4. The detail on sheet 16 appears to be for a temporary riser setup. Please correct, and add these details to the cross-section. Detail 1 on sheet 12 now shows the final riser setup. Trash racks and water quality orifices are now reflected on the cross sections. This now appears to be sheet 20. Please remove the temporary measures from the stormwater management plan. Please add permanent riser controls to the plan sections. Please show any blankets(filter diaphragms) or cradles in the cross sections. In association with the proposed site plan, the temporary measures are now removed from the stormwater plan. The permanent riser controls are now added to the cross sections on sheets 6, 9, and 12. 5. It is unclear how the planting table on sheet 10 is to be incorporated on the plan. Revl. Show a typical planted area. Planting plans have been clarified on sheets 7, 10, 14 and 17, with notes and details included �., on sheet 21. 6. Please remove rip-rap rather than compacting into fill on dams, which appears as though it could leave a water conduit through the structural fill if not done very well. Rev.1: Section D-D' is still an issue,with rip rap shown at the base of the dam. However,the wet swale needs to be revised anyway. Converted sediment trap cross sections now show removal of the riprap weirs. However, in select locations, the rip rap will be re-used on the principal spillways weirs and as outfall protection. This is indicated on each respective cross section where it applies. The rip rap at the base of the dam is now removed. 7. See cross-section comments for Area 1-2. Most apply here. Rev.1: Not addressed. The cross section appears incorrect. Sheet 14 shows a wetland shelf, but the section does not. The top of the dam must be wide enough for access 10 foot typically. The two sections, of the same facility, show difference slopes on the dam. The emergency weir must be dimensioned and detailed. Cross sections have been adjusted per Area 1-2 comments including the following: - Sections re-pulled to be perpendicular and/or labelled slopes corrected to reflect/clarify skew o section for contractor. - Station and elevation data labeled at critical slope breaks - Height and width dimensioning `.. - Depiction and labels of spillways, cleanouts and under drains on the cross sections - Riser details and anti-clogging measures depicted on sections Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 14 of 22 Reference: Rivanna Village WPO 201400077 - Sections now show proposed structural fill clearly. - Routed water surface elevations based on hydrologic modeling (TR-55 model included on CD and graphically depicted on sheet 23. - Soil specifications are added to the sections - The sections clearly show proposed outfall configurations. 8. Rev.1: The VRRM spreadsheets for this block do not match the plans.The drainage area to the pond is listed at 3.09 acres and 9.93 on the plans. IN addition, there are uncontrolled areas of disturbance not captured by facilities which must contribute to load computations. The VRRM spreadsheets are updated for consistency. Specifically, the drainage area to the pond is 10.05 acres. The uncontrolled areas of disturbance are now included as part of the total Phosphorus load and summarized on sheet 4. 9. Rev.1 Please address adequate channel ouffalls for both basins. In order to demonstrate adequate outfalls, a node based post development routed hydrologic analysis was completed at each outfall and compared to existing conditions. As shown on sheets 22 and 23 and supported with hydrologic modeling results (see attached "stormwater calculations"report) post development routed peak discharges are less than pre development and energy balance is achieved at the project outfalls. 10. Rev.1: Please provide the routing computations for each basin or pond to verify water elevations shown on the plans and required volumes. The results on sheet 26 do not provide enough detail to be independently verified. In order to evaluate channel adequacy, pre and post development hydrologic models (TR- 55 methodology) were developed for specific points of interest located primarily at BMP outfalls. All proposed BMP facilities are routed with the proposed storage volumes and spillway configuration depicted on the plans, designed to attenuate post development discharges to pre development levels. In addition, the energy balance method was utilized to evaluate main discharge points. The hydrologic analysis is summarized on sheets 22 and 23, and an associated "stormwater calculations"report is provided to facilitate review. Area 4: 1. Please do not include off-site areas which can be diverted. These areas may change in the future, affecting results. Rev.1: HS3a still shows a large portion of its contributing area on the fire station property. The parking lot must be shown as impervious in the computations if this is to remain. Drainage area HS3a has includes a portion of the fire station property and the BMP is sized to accommodate this flow. The VRRM calculations are now updated to reflect the treatment of this area. While it does not contribute to load removal required, it is credited. If the land use changes on that parcel, it is our understanding that stormwater management `" would accompany that change. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 15 of 22 Reference: Rivanna Village WPO 201400077 2. Please see comments for areas 1-3, many apply here. Rev.1 See below. 3. Rev.1.The wet swale without a water source is not a viable option here. Please change to a biofilter. The proposed wet swale is located in hydric soils. 4. Rev.1: Show cleanouts and layout of underdrains, as the sections seem to indicate all drain through the dam. Only 1 underdrain will go through the dam per each bioretention facility. The cross sections now clearly show the one drainage point, generally aligned with the spillway. 5. Rev.1: The rip rap shown through the dam is still an issue, as it is lower than the biofilters. In addition,the outlet elevation of the flows cannot be controlled in inches with rip rap sizes much larger. The rip rap in the dam is now removed from the sections. The proposed spillways are now revised to include cobble lined or vegetated spillways which are specified in section and tabular view on each applicable cross section. 6. Rev.1: The VRRM spreadsheets for this block must account for the disturbed areas that are going untreated. The VRRM spreadsheets clearly indicate that uncontrolled areas are accounted for in the load removal requirement. The load generated from uncontrolled areas that is required removal is 2.48 lbs TP. This load is treated elsewhere ono the site so that the site as a whole meets water quality criteria. 7. Please address adequate ouffall for both basins. In order to demonstrate adequate outfalls, a node based post development routed hydrologic analysis was completed at each outfall and compared to existing conditions. As shown on sheets 22 and 23 and supported with hydrologic modeling results (see attached "stormwater calculations"report) post development routed peak discharges are less than pre development and energy balance is achieved at the project outfalls. 8. Please provide the routing computations for each basin to verify water elevations shown on the pans and required volumes. In order to evaluate channel adequacy, pre and post development hydrologic models (TR- �► 55 methodology) were developed for specific points of interest located primarily at BMP outfalls. All proposed BMP facilities are routed with the proposed storage volumes and Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3, 2015 Mr. Max Greene Page 16 of 22 Reference: Rivanna Village WPO 201400077 spillway configuration depicted on the plans, designed to attenuate post development discharges to pre development levels. In addition, the energy balance method was utilized to evaluate main discharge points. The hydrologic analysis is summarized on sheets 22 and 23, and an associated "stormwater calculations"report is provided to facilitate review. C. Erosion and Sediment Control Plan (ESCP) Max Greene's comments Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is disapproved, and the reasons are provided in the comments below. The erosion control plan content requirements can be found in County Code section 17-402. 1. Match lines would be helpful to the inspector/contractor. Please note there is a sheet index (3 of 25) which can be used as reference for the layout of subsequent sheets. In addition, sheet references and match lines are now incorporated throughout the plan set for orientation. Comment Addressed. 2. All proposed grade lines will be within the limits of disturbance. L.r.- There are a few grading requirements where proposed roads junction with existing roadways. Tie-ins have been clarified and the limits of disturbance adjusted where needed. Rev.1: Comment does not appear addressed.There are lines outside of the LOD on sheets 5 and 7 of 26 on the SWM plans. The LOD is now revised per the site plan grading, and all locations where land disturbance is proposed are now within the LOD. Specifically, LOD updates are included on sheets 4, 7, 8, 9, and 10. 3. There appears to be a basin proposed on sheet 8 of 9 on the bottom of the page across from the Glenmore entrance. There is no outlet for this sump area. Please explain. Sediment basin BS 1 a (stage 1) will be converted to BS2a (stage 2) : Primary outfall is a 36" diameter riser with 18" outlet barrel. The outlet is covered by cross section C-C' on sheet 10A and can be seen in plan view on sheet 10. Sizing calculations are provided on sheet 9 and 10. Rev.1: Sheet 8 of 19 appears to show the need to fill into the proposed tree protection area or create a ponding area that could lead to erosion across the fill area into the basin. This area is protected by the basin and should be corrected with the site plan grading. Acknowledged. The site plan grading is now adjusted to address this ponding issue and the �.. drop inlets are now included in the stage 2 erosion and sediment control plan. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx COStantec June 3,2015 Mr. Max Greene Page 17 of 22 Reference: Rivanna Village WPO 201400077 4. Silt fence is shown very close to the edge of stream. Please place a note on the plan sheets "Silt Fence and Diversions will be kept a minimum 5' from top of bank. If a discrepancy occurs in the field for silt fence and/or diversion installation then the plans will be amended to reflect the changes required to keep the silt fence and or Diversion a minimum 5' from top of stream bank." Note has been added to sheets 5 through 13. Rev.1: Comment appears adequately addressed at this time. 5. Silt fence should follow contours. Low points in silt fence are pounding areas and tend to fail from excessive collection of water and silt.Traps may be required "in field" should these areas show potential for failure. Project delay could occur if a new plan is required for field adjustments. "Operator" will need to be proactive to prevent delays. Agreed, field coordination will be a priority. Rev.1: Low points and pockets are still proposed in the silt fence alignment with this submittal. Potential fines and delays may occur from run off producing storm events. This office recommends correcting silt fence alignments t7o remove low pockets. Internal silt fence parallel to proposed roadways is now removed in association with the site plan submittal. Generally perimeter silt fence does not have the low pockets referenced above. Specific corrections were made on sheets 8 and 9. 6. Silt fence installed down a slope is essentially a diversion and tend to cause erosive velocities and blow-outs in low points of silt fence. If silt fence must be utilized down slopes then check dams should be installed to slow the velocities and to force the stormwater through the filter fabric. (See note#3) Diversions are recommended for down slope installations. Silt fence is now only shown parallel to slopes and check dams are added as recommended. Where feasible, diversions are now proposed in lieu of silt fence (i.e. 7 of 19) Rev.1: No comment 7. Temporary Stream Crossings do not appear to be adequately addressed. a. Please Refer to VESCH Std. & Spec. 3.24 Temporary Stream Crossing (SC) Design Criteria Page III-221 note d for diversion requirements. b. Please add VESCH Std. & Spec. 3.24 Temporary Stream Crossing (SC) Construction Specifications "Temporary Bridge Crossing" to the plan. A temporary stream crossing detail is provided on detail 4 of sheet 14. VESCH Std. and Spec. 3.24 have been added to the E&S notes on sheet 18. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • ® Stantec June 3, 2015 Mr. Max Greene Page 18 of 22 Reference: Rivanna Village WPO 201400077 Rev.1: Detail 14 on sheet 19 appears adequate at this time. 8. Please place a note on the plans: "Silt fence will NOT be installed across the outlet of any stormwater detention structure. Pipe Outlet: Silt fence shall be installed over the outlet of pipes. Stone Weir: Silt fence shall be turned up slope on either side of weir outlet." Note has been added to sheets 5 through l3. Rev.1:Comment appears adequately addressed at this time. 9. Limits of disturbances appear to include sanitary sewer installation limits. Early grading does not allow for the installation of sanitary sewer lines or other hardscape. Please remove the limits of construction for infrastructure such as sanitary or storm sewer line installation. Infrastructure plans are to be submitted under separate cover by Alan Franklin PE, LLC. As such, this plan addresses disturbance associated with the infrastructure plans. Rev.1: Clearing for the sanitary sewer is not approved with this plan. Proposed clearing limits associated with the sanitary sewer are now adjusted in association with the site plan submittal. Utility plans are now included by Alan Franklin under separate cover. 10. Proposed silt fence appears to have an existing swale intersecting perpendicular to the silt fence.The silt fence directs the storm flows to the low point in the corner adjacent to the wetland area. A diversion and trap should be shown in this location instead of silt fence. Assuming this refers to Block A, a sediment trap (AS 1A-2) is now depicted in stage 1 at the low point that eventually intersections with the proposed diversion swale. Please note that as soon as fill is placed in Block A, and the site graded as proposed, this low spot will no longer exist. Rev.1:This may remain a problem area on sheet 10 of 19. Sheet 10 of 19 depicts a sediment trap during stage 1 erosion and sediment control that will be removed when the site is graded as referenced above. The low spot is converted to a wet swale with positive slope towards a BMP as depicted in the storm water management plan. 11. Sediment basin AS1a is missing the outlet structure and riser pipe on plan view. (Page 7 of 19) Riser and outlet barrel are now shown and labeled accordingly. Rev.1:Comment appears adequately addressed at this time. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr.Max Greene Page 19 of 22 Reference: Rivanna Village WPO 201400077 12. Proposed diversion AS1 a appears to have an existing swale intersecting perpendicular to the diversion and is also the low point of the diversion. Stormwater will not make it to the basin as shown until the fill material is placed. Please show a temporary trap in this location. (Pages 7 of 19) A temporary sediment trap has been added at this location. Rev.1:Comment appears adequately addressed at this time. 13. Silt fence and fill material appear to encroach on existing swale at the top of page 10 of 19. Swales should not be blocked with silt fence. A sediment trap is recommended in this area; otherwise, pull the proposed grading toe of slope back to top of 2 year storm elevation for Swale to prevent erosive undermining of silt fence. Proposed grading has been adjusted. Rev.1:Comment appears adequately addressed at this time. 14. Erosion control measures are not shown for East side of sediment trap BS2b along limits of disturbance. (page 10 of 19) Silt fence has been extended. Rev.1: Silt fence does not meet the minimum requirements of std. and spec 3.05.. The length of the flow path appears to exceed the requirements. The proposed silt fence was re-evaluated and the maximum flow length to the silt fence is 100 feet as depicted on sheet 12. In select locations, we have now added a diversion to re-direct sheet flows longer than 100 feet. The contributing watersheds are now directed to ES 1 and ES2. 15. Silt fences and diversions on Stage 2 plans sheets have all most disappeared from view like the existing contours. Please make sure the shading of E&SC measures that are to remain are clearly recognized on the plan sheets. All E&SC measures (shown in black) shown are to remain until the site is stabilized then will be removed upon completion and stabilization. Rev.1: existing contour lines are still too light to follow. Please darken the existing contour lines. The existing contour lines are now darker and dashed. 16. Proposed travel ways that cross over a diversion will require a pipe or other State approved method designed for the 10 year storm event. Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3,2015 Mr. Max Greene Page 20 of 22 Reference: Rivanna Village WPO 201400077 A pipe has been sized and specified in the plan set for the Block A diversion crossing. The diversion crossings shown for Block B are right-of-way diversions, which will be removed and replaced with appropriate grading in stage 3 as depicted on the stormwater plans.. Rev.1: See comment#21 below. 17.) Proposed grading is shown under and beneath the silt fence on sheet 8 of 19. Please move the silt fence to capture the proposed disturbance. The silt fence is adjusted on sheet 7. 18.) Existing conditions/topography is not legible on several of the plan sheets. Please make the plans legible. Adequate review was not possible for vague pages. Existing contours are now darker for clarity. 19.) This office recommends removing the internal silt fence from the construction site. The internal silt is removed. �•► 20.) Sheet 8 does not appear to match sheet 10 and sheet 10 does not appear to match up with sheet 12 and sheet 12 does not appear to match up to sheet 13 etc. Please make plans match/overlay. Matchlines are now adjusted sheet layouts updated accordingly. 21.)The right of way diversions appear to be labelled (DV) instead of(RWD). Right of way diversion labels are updated on sheets 7 and 9. 22.) Please label all baffles in basins. The baffles are now labelled and a detail is provided. Additional comments and/or conditions may be forthcoming due to requested changes to plan. The VSMP permit application and all plans may be resubmitted for approval when all comments have been satisfactorily addressed. For re-submittals please provide 2 copies of the complete permit package with a completed application form. Design with community in mind id u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx Stantec June 3, 2015 Mr. Max Greene Page 21 of 22 Reference: Rivanna Village WPO 201400077 Engineering plan review staffs are available from 2-4 PM on Thursdays, should you require a meeting to discuss this review. Process; After approval, plans will need to bonded.The bonding process is begun by submitting a bond estimate request form and fee to the Department of Community Development. One of the plan reviewers will prepare estimates and check parcel and easement information based on the approved plans. The County's Management Analyst will prepare bond agreement forms,which will need to be completed by the owner and submitted along with cash, certificates or sureties for the amounts specified.The agreements will need to be approved and signed by the County Attorney and County Engineer. This may take 2-4 weeks to obtain all the correct signatures and forms. Stormwater Management Facilities Maintenance agreements will also need to be completed and recorded.The County's Management Analyst or other staff will prepare the forms and check for ownership and signature information.The completed forms will need to be submitted along with court recording fees. After bonding and agreements are complete, county staff will need to enter project information in a DEQ database for state application processing. DEQ will review the application information based on local VSMP authority approval. At this time, the DEQ portion of the application fees will need to be paid directly to the state. For fastest processing, this is done electronically with the emails provided on the application. DEQ should notify applicants with instructions on how to pay fees. When DEQ approves the application, they will issue a permit coverage letter.This should be copied to the county. After DEQ coverage is issued, via the coverage letter, the County can hold a pre-construction conference. Applicants will need to complete the request for a pre-construction conference form, and pay the remainder of the application fee. The form identifies the contractor and responsible land disturber, and the fee remaining to be paid.This will be checked by county staff, and upon approval, a pre-construction conference will be scheduled with the County inspector. At the pre- construction conference,should everything proceed satisfactorily, a joint VSMP and grading permit will be issued by the County so that work may begin. County forms can be found on the county website forms center under engineering; http://www.albemarle.org/deptforms.asp?department=cdengwpo Stantec Consulting Services Inc. 4 J=«"r -'R err Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx • • ® Stantec June 3, 2015 Mr. Max Greene Page 22 of 22 Reference: Rivanna Village WPO 201400077 Scott Blossom Senior Engineer Phone: (757) 220-6869 Fax: (757) 229-4507 scott.blossom @stantec.com Attachment: EBBS Plans, Interim Stormwater Plans, VRRM Spreadsheet, Hydrology Calculations, SWPPP, Maintenance Agreements, VSMP Application, Bond request c. ck, is v�..r Design with community in mind td u:\203400205\02_correspondence\regulators\mem_an_response_alb_eng20150531.docx to�,�jt COUNTY OF ALBEMARLE 1411M1411:, Department of Community Development 401 McIntire Road,North Wing '� - Charlottesville,Virginia 22902-4596 i f,., Tel.(434)296-5832 • Fax(434)972-4126 4�RGI +1's' Stormwater Pollution Prevention Plan (SWPPP) For Construction Activities At: Project Name: Rivanna Village Address: Rivanna Village LLC Mr. Andrew Boninti 314 East Water Street Charlottesville, VA 22902 Prepared by: Name: Stantec Consulting Services Inc Prepared for: Name: Rivanna Village LLC SWPPP Preparation Date: February 10, 2015, Revised June 1, 2015 (This document is to be made publicly available according to 9VAC25-880-70, Part II, section D) Issued— 10/2014 Stormwater Pollution Prevention Plan (SWPPP) Albemarle County Nam. CONTENTS: (from Albemarle County Code Sec. 17-405) 1. Registration Statement 2. Notice of General Permit Coverage 3. Nature of Activity 4. Erosion and Sediment Control Plan 5. Stormwater Management Plan 6. Pollution Prevention Plan. 7. Discharges to impaired waters, surface waters within an applicable TMDL wasteload allocation, and exceptional waters 8. Qualified Personnel 9. Signed Certification 10. Delegation of Authority 11. General Permit Copy 12. Inspection Logs APPENDICES: Appendix A Log of Changes and Updates to SWPPP Appendix B Grading and Stabilization Activities Log Appendix C Maintenance Agreements for Stormwater Management Facilities Appendix D Spill Report Form Appendix E Corrective Action Log Appendix F Contractor/Subcontractor Certifications/Agreements Appendix G Additional Supporting Information Issued— 10/2014 Stormwater Pollution Prevention Plan (SWPPP) Albemarle County Section 1. Registration Statement *or (Provide a signed completed copy of the DEQ registration statement) A signed completed copy of the DEQ registration statement will be provided in Section 1 of this SWPPP. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County Registration Statement General VPDES Permit for Discharges of Stormwater from Construction Activities (VAR10) (Please Type or Print All Information) 1. Construction Activity Operator: (General permit coverage will be issued to this operator. The Certification in Item #12 must be signed by the appropriate person associated with this operator.) Name:Rivanna Village LLC Contact:Mr.Andrew Boninti Mailing Address:314 East Water Street City:Charlottesville State:VA Zip:22902 Phone:434-284-4006 Email address(if available):andrew.boninti @cbre-charlottesville.com Indicate if DEQ may transmit general permit correspondence electronically: Yes 0 No❑ 2. Existing General Permit Registration Number(for renewals only):N/A 3. Name and Location of the Construction Activity: Name:Rivanna Village Address(if available): City: State:VA Zip: County(if not located within a City):Albemarle County Latitude(decimal degrees):38.005763 N Longitude(decimal degrees):78.376710 W Name and Location of all Off-site Support Activities to be covered under the general permit: Name:N/A Address(if available): City: State: Zip: County(if not located within a City): Latitude(decimal degrees): Longitude(decimal degrees): 4. Status of the Construction Activity(check only one): Federal❑ State❑ Public❑ Private 0 �.r. 5. Nature of the Construction Activity(e.g.,commercial, industrial, residential,agricultural,oil and gas,etc.): Residential and commercial 6. Name of the Receiving Water(s)and Hydrologic Unit Code(HUC): Name:Unnamed tributaries to Carroll Creek Name: HUC: JR17/H29 HUC: 7. If the discharge is through a Municipal Separate Storm Sewer System(MS4),the name of the MS4 operator: Albemarle County 8. Estimated Project Start and Completion Date: Start Date(mm/dd/yyyy):8/1/2015 Completion Date(mm/dd/yyyy):8/1/2017 9. Total Land Area of Development(to the nearest one-hundredth acre):32.42 acres Estimated Area to be Disturbed(to the nearest one-hundredth acre): 32.42 acres 10. Is the area to be disturbed part of a larger common plan of development or sale? Yes 0 No❑ 11. A stormwater pollution prevention plan (SWPPP) must be prepared in accordance with the requirements of the General VPDES Permit for Discharges of Stormwater from Construction Activities prior to submitting this Registration Statement. By signing this Registration Statement the operator is certifying that the SWPPP has been prepared. 12. Certification: "I certify under penalty of law that I have read and understand this Registration Statement and that this document and all attachments were prepared in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief true, accurate, and complete. I am aware that there are significant penalties for submitting false information including the possibility of fine and imprisonmentirr knowin. violations." Printed Name: AS J,�rlA-71 Title: G7L�/j Signature: O/ Date: -- /S (Please sign in INK. This Certification must be signed by the appropriate person associated with the operator identified in `"ore Item#1.) 07/2014 Page 1 of 1 assigned or delegated to the manager in accordance with Item 7:MS4 Information. corporate procedures. If stormwater is discharged through a municipal separate storm sewer b. For a partnership or sole proprietorship: by a general partner or system(MS4),provide the name of the MS4 operator.The name of the the proprietor,respectively. MS4 operator is generally the Town, City, County, Institute or Federal facility where the construction activity is located. c. For a municipality,state,federal, or other public agency: by either a principal executive officer or ranking elected official. For purposes Item 8: Construction Activity Start and Completion Date of this part,a principal executive officer of a public agency includes: Information. (i)The chief executive officer of the agency,or Provide the estimated start date (month/day/year) of the construction activity. Provide the estimated completion date (month/day/year) of (ii)A senior executive officer having responsibility for the overall the construction activity. operations of a principal geographic unit of the agency. Item 9:Construction Activity Area Information. Provide the total area (to the nearest one-hundredth acre) of the development (i.e.., the total acreage of the larger common plan of development or sale). Include the total acreage of any off-site support activity to be covered under this general permit. Provide the estimated area(to the nearest one-hundredth acre)to be disturbed by the construction activity. Include the estimated area of land disturbance that will occur at any off-site support activity to be covered under this general permit. Item 10:Common Plan of Development or Sale Information. Indicate if the area to be disturbed by the construction activity is part of a larger common plan of development or sale. Larger common plan of development or sale is defined as a contiguous area where separate and distinct construction may be taking place at different times on different schedules. Plan is broadly defined as any announcement or documentation, including a sign, public notice or hearing, sales pitch, advertisement, drawing, permit application, zoning request, etc., or physical demarcation such as boundary signs, lot stakes, or surveyor markings indicating that construction activities may occur. 'Now, Item 11:Stormwater Pollution Prevention Plan(SWPPP). A Stormwater Pollution Prevention Plan(SWPPP)must be prepared in accordance with the requirements of the General VPDES Permit for Discharges of Stormwater from Construction Activities(VAR10)prior to submitting this Registration Statement. By signing this Registration Statement the operator is certifying that the SWPPP has been prepared. Item 12:Certification. A properly authorized individual associated with the operator identified in Item 1 of the Registration Statement is responsible for certifying and signing the Registration Statement. Please sign the Registration Statement in INK. State statutes provide for severe penalties for submitting false information on the Registration Statement. State regulations require that the Registration Statement be signed as follows: a. For a corporation: by a responsible corporate officer. For the purpose of this part,a responsible corporate officer means: (i) A president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function,or any other person who performs similar policy-making or decision-making functions for the corporation,or (ii) the manager of one or more manufacturing, production, or operating facilities, provided the manager is authorized to make management decisions that govern the operation of the regulated facility including having the explicit or implicit duty of making major capital investment recommendations, and initiating and directing other comprehensive measures to assure long-term compliance with environmental laws and regulations;the manager can ensure that the necessary systems are established or actions taken to gather complete and accurate information for permit application requirements; and where authority to sign documents has been 07/2014 Page 2 of 2 Section 2. Notice of General Permit Coverage (This notice is to be posted near the main entrance according to 9VAC25-880-70, Part II, section C.) (Provide a copy of the DEQ coverage letter when obtained) Upon commencement of land disturbance, a copy of the DEQ notice of coverage letter will be posted near the main entrance of the construction activity. Information for public access to the SWPPP (name and telephone number of a contact person for SWPPP availability) shall also be posted and maintained in accordance with Part II C (of the CGP). Operator(s): Rivanna Village LLC Mr. Andrew Boninti 314 East Water Street Charlottesville, VA 22902 434-284-4006 andrew.boninti@cbre-charlottesville.com The operator shall maintain the posted information until termination of general permit coverage as specified in Part I F (of the CGP). The notice of coverage letter and a copy of the notice of termination (NOT) form are provided in Section 2 of this SWPPP. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County INSERT A COPY OF YOUR NOTICE OF COVERAGE LETTER HERE Notice of Termination General VPDES Permit for Discharges of Stormwater from Construction Activities (VAR10) (Please Type of Print All Information) 1. Construction Activity Operator: Name: Rivanna Village LLC Contact:Mr. Andrew Boninti Mailing Address:314 East Water Street City:Charlottesville State:VA zip:22902 Phone: 434-284-4006 Email address(if available):andrew.boninti @cbre-charlottesville.com 2. Name and Location of the Construction Activity: (As listed on the Registration Statement.) Name:Rivanna Village Address(if available): City: State:VA Zip: County(if not located within a City):Albemarle County Latitude(decimal degrees):38.005763 N Longitude(decimal degrees):78.376710 W 3. General Permit Registration Number: 4. Reason for Terminating Coverage Under the General Permit: (The operator shall submit a Notice of Termination after one or more of the following conditions have been met.) ❑ A. Necessary permanent control measures included in the SWPPP for the site are in place and functioning effectively and final stabilization has been achieved on all portions of the site for which the operator is responsible. When applicable, long-term responsibility and maintenance requirements for permanent control measures shall be recorded in the local land records prior to the submission of a notice of termination; ❑ B.Another operator has assumed control over all areas of the site that have not been finally stabilized and obtained coverage for the ongoing discharge; ❑ C. Coverage under an alternative VPDES or state permit has been obtained; or (1 D. For residential construction only,temporary soil stabilization has been completed and the residence has been transferred to the homeowner. The notice of termination should be submitted no later than 30 days after one of the above conditions being met. Authorization to discharge terminates at midnight on the date that the notice of termination is submitted for the conditions set forth in subsections B through D above, unless otherwise notified by the VSMP authority or the Department. Termination of authorizations to discharge for the conditions set forth in subsection A above shall be effective upon notification from the Department that the provisions of subsection A have been met or 60 days after submittal of the notice of terminations, whichever occurs first. 5. Permanent Control Measures Installed: (When applicable, a list of the on-site and off-site permanent control measures (both structural and nonstructural)that were installed to comply with the stormwater management technical criteria.Attach a separate list if additional space is needed.) Permanent Control Measure#1 Type of Permanent Control Measure: Date Functional: Address(if available): City: State: Zip: County(if not located within a City): . Latitude(decimal degrees): Longitude(decimal degrees): Receiving Water: Total Acres Treated: Impervious Acres Treated: 01/2014 Page 1 of 2 Instructions for Completing the Notice of Termination General VDPES Permit for Discharges of Stormwater from Construction Activities (VAR1O) GENERAL b. The date that the permanent control measure became functional A Notice of Termination must be submitted when an operator no longer as a post-development stormwater management control; wishes to be covered under the General VPDES Permit for Discharges of Stormwater from Construction Activities(VAR10). c. The street address (if available), City or County (if not located within a City)of the permanent control measure; All Notice of Terminations should be submitted to: d. The latitude and longitude in decimal degrees of the approximate Department of Environmental Quality center of the permanent control measure; Office of Stormwater Management,10th Floor P.O.Box 1105 e.The receiving water of the permanent control measure;and Richmond,VA 23218 f. The number of total and impervious acres treated by the LINE-BY-LINE INSTRUCTIONS permanent control measure(to the nearest one-tenth of an acre). Item 1: Construction Activity Operator Information. Attach a separate list if additional space is needed. Provide the legal name(do not use a colloquial name),contact,mailing Item 6: Participation in a Regional Stormwater Management Plan address, telephone number, and email address (if available) of the (when applicable). construction activity operator that was issued general permit coverage. For each Regional Stormwater Management Facility provide the Item 2: Name and Location of the Construction Activity following information: Information. a.The type of regional facility to which the site contributes; Provide the official name,street address(if available),city or county(if not located within a City)of the construction activity. Also, provide the b. The street address (if available), City or County (if not located latitude and longitude in decimal degrees of the approximate center of within a City)of the regional facility; the construction activity (e.g., N 37.5000, W 77.5000). NOTE: This information can be obtained from the previously submitted Registration c.The latitude and longitude in decimal degrees of the approximate Statement. center of the regional facility;and Item 3:General Permit Registration Number. d. The number of total and impervious site acres treated by the regional facility(to the nearest one-tenth of an acre). Provide the existing general permit registration number for the construction activity identified in Item 2. Attach a separate list if additional space is needed. Item 4: Reason for Termination. Item 7: Perpetual Nutrient Credits(when applicable). Indicate the appropriate reason for submitting this Notice of Provide the following information related to perpetual nutrient credits Termination. The Notice of Termination may only be submitted after that were acquired in accordance with§62.1-44.15:35 of the Code of one or more of the following conditions have been met: Virginia: a. Necessary permanent control measures included in the SWPPP a. The name of the nonpoint nutrient credit generating entity from for the site are in place and functioning effectively and final which perpetual nutrient credits were acquired;and stabilization has been achieved on all portions of the site for which the operator is responsible.When applicable,long-term responsibility b. The number of perpetual nutrient credits acquired (lbs. per acre and maintenance requirements for permanent control measures shall per year). be recorded in the local land records prior to the submission of a notice of termination; Attach a separate list if additional space is needed. b. Another operator has assumed control over all areas of the site Item 8:Certification. that have not been finally stabilized and obtained coverage for the ongoing discharge; A properly authorized individual associated with the operator identified in Item 1 of the Registration Statement is responsible for certifying and c. Coverage under an alternative VPDES or state permit has been signing the Registration Statement. Please sign the Registration obtained;or Statement in INK. d. For residential construction only, temporary soil stabilization has State statutes provide for severe penalties for submitting false been completed and the residence has been transferred to the information on the Registration Statement. State regulations require homeowner. that the Registration Statement be signed as follows: The Notice of Termination should be submitted no later than 30 days a. For a corporation: by a responsible corporate officer. For the after one of the above conditions being met. purpose of this part,a responsible corporate officer means: Item 5: Permanent Control Measures(when applicable). (i) A president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function, or any other For each on-site and off-site permanent control measure (both person who performs similar policy-making or decision-making structural and non-structural) that was installed to comply with the functions for the corporation,or Na„„ stormwater management technical criteria provide the following information: (ii) the manager of one or more manufacturing, production, or operating facilities, provided the manager is authorized to make a.The type of permanent control measure; management decisions that govem the operation of the regulated 01/2014 Page 1 of 2 Section 3. Nature of Activity Noy (Provide a detailed narrative of the construction activities. Include or reference a construction schedule and sequence. Include any phasing.) Description of Project Stormwater Plans The proposed stormwater plan for Phase 1 of Rivanna Village consists of those measures necessary to manage stormwater runoff from the prepared Phase 1 Development(see site plans submitted by Alan Franklin, P.E.). Specifically,this plan addresses: - Stormwater controls which utilize the E&S practices where applicable to transition temporary erosion and sediment control measures to permanent stormwater controls - Stormwater BMPs designed in accordance with State standards using the Virginia runoff reduction methodology (see stormwater calculations provided on the plans) The plan is designed to allow for installation of proposed linear infrastructure and roadways and specifies measures that will manage runoff from developed areas. Proposed stormwater practices include: - Upland BMPs including biofiltration cells and associated swales - Wet swales designed according to State standards and located in close proximity to existing wetland features in a similar topographic position - A Level 2 wet pond design in the location of the future wet pond forebay,treating the developed areas within blocks c and d. Phase 1 areas consist generally of those located on the western portion of the site accessed by Glenmore Way. Traffic management practices are proposed under separate cover and shall be implemented in coordination with the access measures proposed herein. Although the proposed forebay of the main future wet pond will be installed with this phase, there is no disturbance proposed in the stream buffer, as the main wet pond will be installed with future phases. Phase I project area(limits of disturbance) = 32.14 acres± E&S Plans The proposed Erosion and Sediment Control Plan for Phase 1 of Rivanna Village consists of those measures necessary to prevent sediment laden runoff from entering downstream waterways. Specifically,this plan addresses: - Access to the site - Staging and stockpile areas - Construction sequencing Issued— 10/2014 Stormwater Pollution Prevention Plan (SWPPP)Albemarle County - Onsite erosion and sediment control facilities including perimeter controls, sediment traps, and sediment basins - Stabilization practices to be implemented during construction in a phased manner to treat disturbed areas The plan is designed to specify measures that will provide erosion and sediment control for disturbed areas associated with clearing, grading, and storm drain infrastructure. Proposed erosion and sediment control measures include: 1. Minimization of site disturbance to preserve stream buffers and riparian corridors. 2. Phased construction practices with stabilized construction entrances and construction road stabilization. 3. Perimeter controls including tree protection, diversions, swales, and silt fence. 4. Combination of sediment traps and basins used in coordination with diversions and swales. 5. Temporary and permanent stabilization of slopes and graded areas. Phase 1 areas consist generally of those located on the western portion of the site accessed by Glenmore Way. Traffic management practices are proposed under separate cover and shall be implemented in coordination with the access measures proposed herein. Although the proposed forebay of the primary wet pond will be installed with this phase, there is no disturbance proposed in the stream buffer that is associated with erosion and sediment control, as the main wet pond will be installed with future phases. viwy A general location map showing the location of the project site is provided on the cover page of the plans in Sections 4 and 5 of this SWPPP. Size of Construction Project Total Area of Development= 32.42 (in acres) Estimated Area to be Disturbed= 32.42 (in acres) Project Latitude/Longitude Latitude: 38.005763 °N (decimal) Longitude: 78.376710 °W(decimal) Sequence of Construction • All erosion and sediment control measures are to be placed prior to or as the first step in clearing. • Erosion and siltation control measures shall be provided in accordance with the approved erosion control plan and shall be installed prior to any clearing, grading or other construction. • The plan approving authority must be notified one week prior to the pre-construction conference, one week prior to the commencement of land disturbing activity, and one week prior to the final inspection. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County • A construction sequence is provided on the plans for the project. The plans are incorporated by reference as part of this SWPPP and are provided in this SWPPP. Information on when major grading activities occur and when construction activities temporarily or permanently ceases on a portion of the site will be provided on the inspection reports for the project(Section 12 of this SWPPP) and/or included in a SWPPP updates section (Appendix A) or on a grading and stabilization activities log (Appendix B). Inspection reports summarizing each inspection shall be retained onsite as part of this SWPPP. Issued— 10/2014 Stormwater Pollution Prevention Plan (SWPPP) Albemarle County Section 4. Erosion and Sediment Control Plan 5... (Provide a reduced, 11x17 copy of the latest Erosion and Sediment Control Plan. Do not reference only). A copy of the Erosion and Sediment Control Plans is provided in Section 4 of this SWPPP. This SWPPP was prepared for submittal concurrent with the erosion and sediment control plans for review by the VSMP Authority. Once approved,the approved erosion and sediment control plan is hereby incorporated by reference as part of this SWPPP. • All erosion and sediment control measures shall be installed and maintained in accordance with the Virginia Erosion and Sediment Control Handbook, Third Edition, 1992. • All control measures must be properly maintained in effective operating condition in accordance with good engineering practices and, where applicable, manufacturer specifications. If a site inspection required by Part II F (of the CGP) identifies a control measure that is not operating effectively, corrective action(s) shall be completed as soon as practicable, but no later than seven days after discovery or a longer period as established by the VSMP authority, to maintain the continued effectiveness of the control measures. • If site inspections required by Part II F (of the CGP) identify an existing control measure that needs to be modified or if an additional control measure is necessary for any reason, implementation shall be completed prior to the next anticipated measurable' storm event. If implementation prior to the next anticipated measurable storm event is impracticable, then alternative control measures shall be implemented as soon as practicable, but no later than seven days after discovery or a longer period as established by the VSMP authority. • Information on required inspections is provided in Sections 7, 8, and 12 of this SWPPP. A properly implemented approved erosion and sediment control plan, "agreement in lieu of a plan," or erosion and sediment control plan prepared in accordance with department-approved annual standards and specifications,that adequately: (1) Controls the volume and velocity of stormwater runoff within the site to minimize soil erosion(MS-11 and MS-19, Environmental Site Design Principles 6 & 7, Std. & Spec. 3.18-3.21); • Sediment basins and traps, perimeter dikes, sediment barriers and other measures intended to trap sediment shall be constructed as a first step in any land disturbing activity and shall be made functional before upslope land disturbance takes place; (2) Controls stormwater discharges, including peak flow rates and total stormwater volume, to minimize erosion at outlets and to minimize downstream channel and stream bank erosion(MS-11 and MS-19, Environmental Site Design Principle 6); 1 Note:Measurable storm event means a rainfall event producing 0.25 inches of rain or greater over 24 hours. Issued— 10/2014 Stormwater Pollution Prevention Plan (SWPPP) Albemarle County • Sediment basins and traps,perimeter dikes, sediment barriers and other measures intended to trap sediment shall be constructed as a first step in any land disturbing yw activity and shall be made functional before upslope land disturbance takes place; (3) Minimizes the amount of soil exposed during the construction activity (MS-1, MS-3 & MS-4, Environmental Site Design Principles 3, 4 & 5); • Stabilization practices to be implemented during control in a phased manner to treat disturbed areas as shown on the plans; (4) Minimizes the disturbance of steep slopes (MS-7, MS-8 & MS-9, Environmental Site Design Principles 3 & 5); • Blanketing and matting is to be provided for steep slopes as shown on the erosion and sediment control plans; (5) Minimizes sediment discharges from the site in a manner that addresses (i) the amount, frequency, intensity, and duration of precipitation; (ii) the nature of resulting stormwater runoff; and(iii) soil characteristics, including the range of soil particle sizes present on the site (19 Minimum Standards, Stds & Specs of the VESCH Chapter 3); • Soils information is provided on the erosion and sediment control plans for the project; (6) Provides and maintains natural buffers around surface waters, directs stormwater to vegetated areas to increase sediment removal, and maximizes stormwater infiltration, unless infeasible (Environmental Site Design Principles 4, 5 & 8, Std. & Spec. 3.38); • Stream buffer limits to be clearly identified in the field prior to land disturbance with tree protection fencing; • Tree protection will be installed along the stream buffer as shown on the plans; (7) Minimizes soil compaction and, unless infeasible, preserves topsoil (MS-2, Std. & Spec. 3.30, Environmental Site Design Principle 4 & 8); • Areas to remain undisturbed are shown on the plans based on the limits of disturbance; (8) Ensures that stabilization of disturbed areas will be initiated immediately whenever any clearing, grading, excavating, or other land-disturbing activities have permanently ceased on any portion of the site, or temporarily ceased on any portion of the site and will not resume for a period exceeding 14 days (MS-1, MS-3 &MS-18, Stds & Specs 3.28 to 3.38); and • Stabilization of disturbed areas will be initiated immediately whenever any clearing, grading, excavating, or other land-disturbing activities have permanently ceased on any portion of the site, or temporarily ceased on any portion of the site and will not resume for a period exceeding 14 days. Immediately means as soon as practicable, but no later than the end of the next business day, following the day when the land-disturbing activities have temporarily or permanently ceased. Immediately is used in the context of the CGP to define the deadline for initiating stabilization measures; Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County • As outlined in Part I.B.4.b. of the CGP, permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on 'N.r any portion of the site; (9)Utilizes outlet structures that withdraw stormwater from the surface (i.e., above the permanent pool or wet storage water surface elevation), unless infeasible, when discharging from sediment basins or sediment traps (Stds & Specs 3.13 and 3.14); • Outlet structures that withdraw stormwater from the surface (i.e., above the permanent pool or wet storage water surface elevation) must be utilized, unless infeasible, when discharging from sediment basins or sediment traps. 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CD O9 N r"C1 0 Section 5. Stormwater Management Plan ```'" (Provide a reduced 11x17 copy of the latest Stormwater Management Plan. Do not reference only). A copy of the Stormwater Management Plan is provided in Section 5 of this SWPPP. This SWPPP was prepared for submittal concurrent with the stormwater management plans for review by the VSMP Authority. Once approved, the approved stormwater management plan is hereby incorporated by reference as part of this SWPPP. The VSMP authority shall require the provision of long-term responsibility for and maintenance of stormwater management facilities and other techniques specified to manage the quality and quantity of runoff. Such requirements shall be set forth in an instrument recorded in the local land records prior to state permit termination or earlier as required by the VSMP authority and shall at a minimum: (1) Be submitted to the VSMP authority for review and approval; (2) Be stated to run with the land; (3) Provide for all necessary access to the property for purposes of maintenance and regulatory inspections; (4) Provide for inspections and maintenance and the submission of inspection and maintenance reports to the VSMP authority; and (5) Be enforceable by all appropriate governmental parties. Copies of signed maintenance agreements for stormwater management facilities should be included in Appendix C. ittimer Issued— 10/2014 Stormwater Pollution Prevention Plan (SWPPP) Albemarle County ..o err vas ' :1,..'".E17.:• N‘irr0;.t.stWA, '' ,'S'461 ri: ' , , t ry . m m m r D x m TT n to m m n CD m D M m n Ca II n ;:: r cn _ —I cn 0 r o D Z O D A C C O D A D- • , r.:m x x K = = 0 S S f ,ry - a t a s �.� , ,� D%- r ¢ < C Z Z c m m 0 • A m r m D Z Z cn m K m O.� � ^milk p D O m C A O ? n -S m D A A < D m m r � N D Z m co < r N D r'',i.--'1,, Y'- w. m ∎♦' Z'' i11 4�I •r ro 1Atilt ' O r Z ' m o m 0 A m m Q - )y, 1 J , / ' .1 p m ^ W a < n m �,°i II'r, 44 ' itie K O ;0 :! �— N 2 > o O _ m of °' � � m _ w ,t 1 s �" III 0 (I) ;� �' „ :;✓, ›, 1, V /tom» \ ,„ m (.,... ,,,„,,..,:::_r.,;•,:„. ,„,,, \ _;4K .. ,_ ...„..„. .••• . , •. • . : _ W 0 N A m<mZ 2 CU m O N67 N mmDOO� - cp A D D 31) <��AAO m 0 cn 0 D al �D2Z Z° Z T T (n Om ��< (� I+ I+ I+ I+ m g ADin$'rO mC V 8Oc, .3D7 N Z N OW K Z / - \ m›.-.- c v , r < * W .��g/�p/�� yyam - w i.® n .�, l f '� /1■ `� 441 L f z WWI „ .. 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I III 111 i . .�a 1,10 a„A v o S $m m. .b• �1 l/1 h IL11 1 o zz � e z� xa y� o ff m 0 " P! P! oiI I ITT y zD y ➢a z s ° N- �Em ry m m wm °`m ,,,,4Q sm 0 ocan r N NA n ?2,z1'1'?2,z1'1' g-m>< „,_:,1 o o no� n v � z�o 00 o0 y o m n mD n n n o N y � P o Rw g N mZ<* 1. 2-° rt m c o so � o m<a m v oN o m q” 6' rn 0 1 m Oypa Nl n z g G<Om r_; P 4 a) g o 8 n° Z0 . CO s ➢A�3� N. �y�m n -o -o ii=e A - _ . a ro�N N> m o� ir , < m '�w 6m - o f 51121; °vv''n i its e � O 3m n' o Z a < Section 6. Pollution Prevention Plan (reference County Code 17-404 and State Regulation 9VAC25-880-70 part II section A.4) A. Plan showing pollution activities and prevention practices (Provide a reduced 11 x 17 copy of a site plan on which all of the following activity locations are clearly marked. Keep this plan up-to-date with ongoing site changes and inspections.) A pollution prevention plan is provided in Section 6 of this SWPPP. This plan shows the proposed locations of support activities including equipment and vehicle washing, storage areas for chemicals, concrete washout areas, vehicle fueling and maintenance areas, sanitary waste facilities (portable toilets), and construction waste storage. Should these proposed locations change, the new locations of the activities will be identified on the pollution prevention plan. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County B. Sources of Pollutants, locations, and prevention practices Pollutant,or Pollutant Prevention Practices, 'Now Generating Activity Location on site Control Measures If practicable,all refueling shall be conducted in a manner to reduce the potential for contamination of onsite Approximate estimated location shown resources. Care should be taken,where Vehicle/equipment fueling on pollution prevention plan feasible,to avoid activities within±50 feet of storm drains,wetlands,streams,water bodies,tree preservation areas or any other environmentally sensitive areas. Spill response kits should be provided onsite. The contractor will regularly inspect the site to insure proper disposal methods of Used oil storage Current designated container areas on used oils are followed. Petroleum plan produces will be stored in tightly sealed containers which are clearly labeled. Spill response kits should be provided onsite. All onsite vehicles will be monitored for Approximate estimated location shown leaks and receive regular preventive Vehicle/equipment maintenance on pollution prevention plan maintenance to reduce the chance of leakage. Spill response kits should be provided onsite. The operator should assure that employees are aware of all applicable wastes,disposal practices,and applicable disposal locations. All waste materials will be Demolition and debris disposal Where needed collected and stored in a proper receptacle in accordance with all local and State solid waste management regulations. Waste will be hauled to an appropriate waste disposal site. No construction waste materials will be buried onsite. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County C. Sources of Pollutants continued. Common activities and minimum control and prevention practices Pollutant,or Pollutant Prevention Practices, Generating Activity Location on site Control Measures Follow erosion and sediment control plan. Clearing,grading,excavating,and un- Land disturbance area Dispose of clearing debris at acceptable stabilized areas disposal sites.Seed and mulch,or sod within 7 days of land clearing Cover storm drain inlets and use drip pans Paving operations Roads and driveways and absorbent/oil dry for all paving machines to limit leaks and spills Direct concrete wash water into a leak- Concrete washout and Approximate estimated location shown Proof container or leak-proof settling basin cement waste on pollution prevention plan that is designed so that no overflows can occur. See EPA fact sheet for concrete washout(Appendix G). Enclose or cover material storage areas. Mix paint indoors in a containment area or Structure construction,stucco, in a flat unpaved area.Prevent the painting, and cleaning Structures discharge of soaps,solvents,detergents and wash water,paint,form release oils and curing compounds. Water shall be filtered,settled or similarly Dewatering operations Dewatering sites shown on plan treated prior to discharge as shown on plan. Designated areas for material delivery and Material delivery and storage Approximate estimated location shown storage. Placed near construction on pollution prevention plan entrances,away from waterways and drainage paths Material use during building process Building areas Follow manufacturer's instructions. MSDS's attached. No""' Waste collection area will not receive a substantial amount of runoff from upland areas and does not drain directly to a Solid waste disposal Current designated container areas on waterway. Containers have lids covered plan before periods of rain,or are in a covered area. Scheduled collection to prevent overfilling.MATERIALS NOT TO BE BURIED ONSITE Convenient and well-maintained portable Approximate estimated location shown sanitary facilities will be provided,and Sanitary waste on pollution prevention plan located away from waterways or inlets. Such facilities shall be regularly maintained. Apply fertilizers in accordance with Site stabilization/landscaping Landscape areas shown on plan manufacturer's recommendations and not during rainfall events To be treated in a sediment basin or better Wash Waters Wash areas shown on plan control as specified on plan.Minimize the discharge of pollutants from equipment and vehicle washing Vehicle and equipment washing Approximate estimated location shown Provide containment and filtering for all on pollution prevention plan wash waters per the plan Minimization of exposure to precipitation and stormwater. Minimize the exposure of building materials,building products,construction wastes,trash,landscape materials,fertilizers,pesticides,herbicides,detergents, sanitary waste,and other materials present on the site to precipitation and to stormwater. slow- Issued— 10/2014 Stormwater Pollution Prevention Plan (SWPPP) Albemarle County (Identify all non-stormwater discharges to occur on your site. Keep this plan up-to-date with ongoing site changes and inspections. See CGP, 9VAC25-880-70 section E for examples of non-stormwater discharges.) D. Non-stormwater discharges The following non-stormwater discharges from construction activities are authorized by the general permit. Discharge Pollutants or Pollutant Location on Site Constituents Discharges from firefighting activities Sediment Where needed Fire hydrant flushings Sediment Where needed Water used to wash vehicles or equipment where soaps,solvents,or Approximate estimated location shown on detergents have not been used and the Sediment,oil&grease,metals pollution prevention plan wash water has been filtered,settled, or similarly treated prior to discharge Water used to control dust that has been filtered,settled,or similarly Sediment Entire site,if needed treated prior to discharge Potable water source,including Sediment Where needed uncontaminated waterline flushings Routine external building wash down where soaps,solvents,or detergents have not been used and the wash water Sediment Where needed has been filtered,settled,or similarly treated prior to discharge Pavement wash water where spills or Now' leaks of toxic or hazardous materials have not occurred(or where all spilled or leaked material has been removed prior to washing);where soaps, Sediment Where needed solvents,or detergents have not been used;and where the wash water has been filtered,settled,or similarly treated prior to discharge Uncontaminated air conditioning or Sediment Where needed compressor condensate Uncontaminated groundwater or Sediment Where needed spring water Foundation or footing drains where flows are not contaminated with Sediment Where needed _process materials such as solvents Uncontaminated,excavation dewatering,including dewatering of trenches and excavations that have Sediment Where needed been filtered,settled,or similarly treated prior to discharge Landscape irrigations Sediment,fertilizers Where needed Nor- Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County E. Persons responsible for pollution prevention practices (Provide the names and contact information for all persons responsible for prevention practices as listed above.) Operator(s): Rivanna Village LLC Mr. Andrew Boninti 314 East Water Street Charlottesville, VA 22902 434-284-4006 andrew.boninti`,cbre-charlottesville.com Project Manager(s) or Site Supervisor(s): Mr. Alexander M. Toomy 434-981-5743 378 Ragged Mountain Rd. Charlottesville, VA 22903 alextoomy@embarqmail.com Stormwater Manager(s) or SWPPP Contact(s): Mr. Alexander M. Toomy 434-981-5743 378 Ragged Mountain Rd. ri., Charlottesville, VA 22903 alextoomy@embarqmail.com Contractor(s): Haley, Chisholm & Morris, Inc. Mr. David Hamer, Superintendent Mr. Mike Boggs P.O. Box 550 Earlysville, VA 22936 434-978-1000 Subcontractor(s): The subcontractor(s) was not determined at the time of SWPPP development. Once the subcontractor(s) is identified, subcontractor certifications will be included in Appendix F of the SWPPP. Emergency 24-Hour Contact(s): Rivanna Village LLC Mr. Andrew Boninti 314 East Water Street Charlottesville, VA 22902 434-284-4006 '...- andrew.boninti @cbre-charlottesville.com Issued— 10/2014 Stormwater Pollution Prevention Plan (SWPPP)Albemarle County F. Response and reporting practices Minimize discharges from spills and leaks. Minimize the discharge of pollutants from spills and leaks and implement chemical spill and leak prevention and response procedures as follows. Respond to all spills, leaks and discharges as follows; Report all spills, leaks and discharges as follows; (Provide detailed response and reporting practices according to 9VAC25-880-70, Part II, section A.4.e.) Spill Prevention and Response The following practices will be followed for spill prevention and cleanup: • Products will be kept in original containers unless they are not resealable. • Original specimen labels and materials safety data sheets will be kept on file; they contain important product information. • If surplus product must be disposed of, manufacturers' and/or local and State recommended methods for proper disposal will be followed. • Manufacturers' recommended methods for spill cleanup will be clearly posted and site personnel will be made aware of the procedures and the location of the information and cleanup supplies. • Materials and equipment necessary for spill cleanup will be kept in the material storage area onsite. Equipment and materials may include but not be limited to cleanup kits, brooms, dust pans, mops, rags, gloves, goggles, dirt to contain spill, containment boom, absorbent material (e.g. hay, kitty litter, sand, sawdust) and plastic and metal trash. • All spills will be cleaned up immediately after discovery. • In the event of a spill of a hazardous substance, the spill will be immediately contained and the spill area will be kept well ventilated. Personnel will wear appropriate protective clothing to prevent injury from contact with a hazardous substance during cleanup operation. • Spills of toxic or hazardous material will be reported to the appropriate State or local government agency, as required by regulatory standards. • The contractor or his representative will be responsible for spill prevention and coordination. • The spill prevention and control procedures will be implemented once construction begins onsite. When a spill occurs, the following individuals/agencies shall be considered for notification. Issued— 10/2014 Stormwater Pollution Prevention Plan (SWPPP) Albemarle County Spill Notification Table Person or Agency Telephone Number Albemarle County Water Resources Management(MS4 Program) (434)296-5816 VA Department of Environmental Quality(DEQ)Pollution Response Program VRO(540)574-7854 VA Department of Emergency Management(DEM) 1-800-468-8892(24 hour#) VA Department of Environmental Quality(DEQ) VRO(540)574-7800 Local Emergency Response 911 (24 hour#) Spill Reporting Reports of Unauthorized Discharges • Any operator who discharges or causes or allows a discharge of sewage, industrial waste, other wastes or any noxious or deleterious substance or a hazardous substance or oil in an amount equal to or in excess of a reportable quantity established under either 40 CFR Part 110, 40 CFR Part 117, 40 CFR Part 302, or § 62.1-44.34:19 of the Code of Virginia that occurs during a 24-hour period into or upon surface waters or who discharges or causes or allows a discharge that may reasonably be expected to enter surface waters, shall notify the Department of Environmental Quality of the discharge immediately upon discovery of the discharge, but in no case later than within 24 hours after said discovery. A written report of the unauthorized discharge shall be submitted to the department and the VSMP authority within five days of discovery of the discharge. The written report shall contain: 1. A description of the nature and location of the discharge; 2. The cause of the discharge; 3. The date on which the discharge occurred; 4. The length of time that the discharge continued; 5. The volume of the discharge; 6. If the discharge is continuing, how long it is expected to continue; 7. If the discharge is continuing, what the expected total volume of the discharge will be; and 8. Any steps planned or taken to reduce, eliminate and prevent a recurrence of the present discharge or any future discharges not authorized by the general permit. • Discharges reportable to the department and the VSMP authority under the immediate reporting requirements of other regulations are exempted from this requirement. • A Spill Report Form is provided in Appendix D of this SWPPP. Reports of Unusual or Extraordinary Discharges. • If any unusual or extraordinary discharge including a "bypass" or "upset", as defined in the permit, should occur from a facility and the discharge enters or could be expected to enter Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County surface waters, the operator shall promptly notify, in no case later than within 24 hours, the department and the VSMP authority by telephone after the discovery of the discharge. ti.. This notification shall provide all available details of the incident, including any adverse effects on aquatic life and the known number of fish killed. The operator shall reduce the report to writing and shall submit it to the department and the VSMP authority within five days of discovery of the discharge in accordance with Section III I 2 in the permit. Unusual and extraordinary discharges include but are not limited to any discharge resulting from: 1. Unusual spillage of materials resulting directly or indirectly from processing operations; 2. Breakdown of processing or accessory equipment; 3. Failure or taking out of service of some or all of the facilities; and 4. Flooding or other acts of nature. Reports of Noncompliance. • The operator shall report any noncompliance which may adversely affect surface waters or may endanger public health. 1. An oral report to the department and the VSMP authority shall be provided within 24 hours from the time the operator becomes aware of the circumstances. The following shall be included as information that shall be reported within 24 hours under this subdivision: a. Any unanticipated bypass; and 44011W- b. Any upset that causes a discharge to surface waters. 2. A written report shall be submitted within five days and shall contain: a. A description of the noncompliance and its cause; b. The period of noncompliance, including exact dates and times, and if the noncompliance has not been corrected, the anticipated time it is expected to continue; and c. Steps taken or planned to reduce, eliminate, and prevent reoccurrence of the noncompliance. The department may waive the written report on a case-by-case basis for reports of noncompliance under Section III I in the permit if the oral report has been received within 24 hours and no adverse impact on surface waters has been reported. 3. The operator shall report all instances of noncompliance not reported under Section III I 1 or 2 (in the permit) in writing as part of the SWPPP. The reports shall contain the information listed in Section III I 2 (in the permit). NOTE: The reports required in Section III G, H and I (in the permit) shall be made to the department and the VSMP authority. Reports may be made by telephone, email, or by fax. For reports outside normal working hours, leaving a recorded message shall fulfill the immediate reporting requirement. For emergencies, the Virginia Department of Emergency Management maintains a 24-hour telephone service at 1-800-468-8892. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County 4. Where the operator becomes aware of a failure to submit any relevant facts, or submittal of incorrect information in any report, including a registration statement, wr to the department or the VSMP authority, the operator shall promptly submit such facts or correct information. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County G. Pollution Prevention Awareness .... (Describe training and procedures to provide awareness and compliance for all measures in this document; waste management, wash waters, prevention measures, etc.) The operator should assure that employees are aware of all applicable wastes, including wash water, disposal practices, and applicable disposal locations of such wastes, in order to comply with the conditions of the CGP. The DEQ recommends that subcontractor certifications should be obtained. Once the subcontractor(s) is identified, subcontractor certifications should be incorporated by reference as part of this SWPPP and will be included in Appendix F of the SWPPP. Personnel should be educated in spill prevention, area of possible pollution, and spill response procedures. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County • LEGEND ❑ PROPOSED _ CONCRETE WASH OUT • •*01R - * PROPOSED 3{t ` PORTABLE TOILETS NNW.' • .- . 14'7. -, PROPOSED VEHICLE • FUELING&FUEL ,422 -- STORAGE AREA f /f• ff EQUIPMENT AND ( ,.' \ �- * VEHICLE WASHING m fy &MAINTENANCE a / *0 CHEMICAL• *�fm STORAGE AREA I8 . - �, �m ' CONSTRUCTION R ~�02,, �mf WASTE STORAGE qq fm J 7'„^.t �4m O ( R / o m am \ �fm +® - - ff `; N 1� : _I \ 1k_ ,_ . . . it 0. r „, . 1 ( ....,. .1:i ... _., .„ ,.§: , „, .. ,. ... . . ,. ,.. v , ..r.. . _ ,�,„„ .. „ . •..,,,,, ... „ . ..„ 1, . .,_ . .. . . . . „ ... . . . . a P 1 , ., . . , . o a ub /. ..e 7 -�» ;\ 4,2 \ \ a % \ %\ \% . t 2 \ /�. 1 2 . \ \,� \ doµ Fo a ----1,910.--. a a* NOTE s M® 1. ALL POLLUTION PREVENTION MEASURES SHALL BE MAINTAINED IN ACCORDANCE WITH THE SPECIFICATIONS PROVIDED IN THE SWPPP. 2 MODIFICATIONS TO THE APPROXIMATE LOCATIONS SHOWN HEREON WILL BE CLEARLY DOCUMENTED IN THE LOG OF SWPPP CHANGES. - :fir, N ® FOR %� Stantec CHARLRIVANNA VILLAGE,ILLC 22902 POLLUTION PREVENTION PLAN 0 200 400 J 314 E.WATER STREET 5209 Center Street APPROXIMATE SCALE (FEET) V011amsburg.VA 23188 JOB NUMBER DRAWN BY CHECKED BY APPROVED BY DATE PHONE(757)220-6869 FAX(757)229-4507 203400205 AWL DT SCB 02/062015 FILEPATH U 12034002DSyC1 earKanalysislswpppWwg_pbase_1 swppp tlw9totayb,JFeb 06.2015 at 1547)Layout 11x11 SWPPP Section 7. Discharges to impaired waters, surface waters within an applicable TMDL wasteload allocation, and exceptional waters. (Provide detailed measures for any applicable TMDL) The project drains to an unnamed tributary to Carroll Creek (HUC JR17/H29). A search of the DEQ VEGIS database shows that the receiving waters are listed as impaired for Benthic-Macroinvertebrate Bioassessments (sediment). The DEQ will perform a search during the processing of the registration statement for permit coverage for receiving waters that drain to waters identified as impaired or for which a TMDL wasteload allocation has been established and approved or that are identified as exceptional waters. This information will be provided with the issuance of the notice of coverage letter. In addition, the Chesapeake Bay Watershed TMDL applies to this project which results in enhanced requirements. Discharges of stormwater from construction activities to surface waters identified as impaired in the 2012 § 305(b)/303(d) Water Quality Assessment Integrated Report or for which a TMDL wasteload allocation has been established and approved prior to the term of the general permit for(i) sediment or a sediment-related parameter(i.e., total suspended solids or turbidity) or(ii) nutrients (i.e., nitrogen or phosphorus) are not eligible for coverage under the general permit unless the operator develops, implements, and maintains a SWPPP that minimizes the pollutants of concern and, when applicable, is consistent with the assumptions and requirements of the approved TMDL wasteload allocations. In addition, the operator shall implement the following items: a. The impaired water(s), approved TMDL(s), and pollutant(s) of concern, when applicable, shall be identified in the SWPPP; b. Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site; c. Nutrients shall be applied in accordance with manufacturer's recommendations or an approved nutrient management plan and shall not be applied during rainfall events; and d. The applicable SWPPP inspection requirements specified in Part II F 2 (of the CGP) shall be amended as follows as per Part I B 4 of the CGP: (1) Inspections shall be conducted at a frequency of(i) at least once every four business days or(ii) at least once every five business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted on the next business day; and (2) Representative inspections used by utility line installation, pipeline construction, or other similar linear construction activities shall inspect all outfalls discharging to surface waters identified as impaired or for which a TMDL wasteload allocation has been established and approved prior to the term of the general permit. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County Section 8. Qualified Personnel The following personnel are responsible for inspections; (Provide the name, telephone number, and qualifications of the qualified personnel conducting inspections.) Inspections will be performed by qualified personnel identified by the operator in the SWPPP. The operator is responsible for insuring that qualified personnel conduct the inspection. Qualified personnel means a person knowledgeable in the principles and practices of erosion and sediment and stormwater management controls who possesses the skills to assess conditions at the construction site for the operator that could impact stormwater quality and quantity and to assess the effectiveness of any sediment and erosion control measures or stormwater management facilities selected to control the quality and quantity of stormwater discharges from the construction activity. The name, phone number, and qualifications of the qualified personnel conducting inspections required by the CGP will be provided either on the inspection forms for the project or provided separately in the SWPPP. Reports summarizing each inspection shall be incorporated by reference and retained as part of this SWPPP. A copy of an example inspection report is provided in Section 12 of this SWPPP. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County Section 9. Signed Certification (Provide certification according to 9VAC25-870-370. For purposes of plan review and approvals, this certification should be the owner of the property, the same signature as appears on the bonds and applications. Another operator can be designated on the delegation of authority form to follow.) CERTIFICATION "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." Owner/Operator Name: �`%d c,t 46/vi �T/ Company: Ai c.-1/}-F„4 �--�- C Title: iffr-4(w9 Signature: Date: - -) S Issued- 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County Section 10. Delegation of Authority `•w' (Provide the persons or positions with authority to sign inspection reports or to modify the stormwater pollution prevention plan. A formal, signed delegation of authority is needed.) DELEGATION OF AUTHORITY I, (name), hereby designate the person or specifically described position below to be a duly authorized representative for the purpose of overseeing compliance with environmental requirements, including the Construction General Permit, at the construction site. The designee is authorized to sign any reports, stormwater pollution prevention plans and all other documents required by the permit. (name of person or position) (company) (address) (city, state, zip) (phone) By signing this authorization, I confirm that I meet the requirements to make such a designation as set forth in the Construction General Permit(CGP), and that the designee above meets the definition of a"duly authorized representative". Operator Name: Company: Title: Signature: Date: Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County Section 11. General Permit Copy (Provide a copy of the construction general permit, 9VAC25-880) A copy of the VPDES Construction General Permit (CGP) is provided in Section 11 of this SWPPP. Norr Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County e.=;' COMMONWEALTH of VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY General Permit No.: VAR10 Effective Date: July 1, 2014 Expiration Date: June 30, 2019 GENERAL VPDES PERMIT FOR DISCHARGES OF STORMWATER FROM CONSTRUCTION ACTIVITIES AUTHORIZATION TO DISCHARGE UNDER THE VIRGINIA STORMWATER MANAGEMENT PROGRAM AND THE VIRGINIA STORMWATER MANAGEMENT ACT In compliance with the provisions of the Clean Water Act, as amended, and pursuant to the Virginia Stormwater Management Act and regulations adopted pursuant thereto, operators of construction Nome activities are authorized to discharge to surface waters within the boundaries of the Commonwealth of Virginia, except those specifically named in State Water Control Board regulations that prohibit such discharges. The authorized discharge shall be in accordance with this cover page, Part I - Discharge Authorization and Special Conditions, Part II - Stormwater Pollution Prevention Plan, and Part III - Conditions Applicable to All VPDES Permits as set forth herein. Nkapw- General Permit No.: VAR10 Page 1 of 21 PART I DISCHARGE AUTHORIZATION AND SPECIAL CONDITIONS A. Coverage under this general permit. 1. During the period beginning with the date of coverage under this general permit and lasting until the general permit's expiration date, the operator is authorized to discharge stormwater from construction activities. 2. This general permit also authorizes stormwater discharges from support activities (e.g., concrete or asphalt batch plants, equipment staging yards, material storage areas, excavated material disposal areas, borrow areas) located on-site or off-site provided that: a. The support activity is directly related to the construction activity that is required to have general permit coverage for discharges of stormwater from construction activities; b. The support activity is not a commercial operation, nor does it serve multiple unrelated construction activities by different operators; c. The support activity does not operate beyond the completion of the last construction activity it supports; d. The support activity is identified in the registration statement at the time of general permit coverage; e. Appropriate control measures are identified in a stormwater pollution prevention plan and implemented to address the discharges from the support activity areas; and f. All applicable state,federal, and local approvals are obtained for the support activity. B. Limitations on coverage. 1. Post-construction discharges. This general permit does not authorize stormwater discharges that originate from the site after construction activities have been completed and the site, including any support activity sites covered under the general permit registration, has undergone final stabilization. Post-construction industrial stormwater discharges may need to be covered by a separate VPDES permit. 2. Discharges mixed with nonstormwater. This general permit does not authorize discharges that are mixed with sources of nonstormwater, other than those discharges that are identified in Part I E (Authorized nonstormwater discharges)and are in compliance with this general permit. 3. Discharges covered by another state permit. This general permit does not authorize discharges of stormwater from construction activities that have been covered under an individual permit or required to obtain coverage under an alternative general permit. 4. Impaired waters and TMDL limitation. Discharges of stormwater from construction activities to surface waters identified as impaired in the 2012 § 305(b)/303(d) Water Quality Assessment Integrated Report or for which a TMDL wasteload allocation has been established and approved prior to the term of this general permit for (i) sediment or a sediment-related parameter (i.e., total suspended solids or turbidity)or(ii) nutrients(i.e., nitrogen or phosphorus) are not eligible for coverage under this general permit unless the operator develops, implements, and maintains a SWPPP that minimizes the pollutants of concern and, when applicable, is consistent with the assumptions and requirements of the approved TMDL wasteload allocations. In addition, the operator shall implement the following items: General Permit No.: VAR10 Page 2 of 21 ww. a. The impaired water(s), approved TMDL(s), and pollutant(s) of concern, when applicable, shall be identified in the SWPPP; b. Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site; c. Nutrients shall be applied in accordance with manufacturer's recommendations or an approved nutrient management plan and shall not be applied during rainfall events; and d. The applicable SWPPP inspection requirements specified in Part II F 2 shall be amended as follows: (1) Inspections shall be conducted at a frequency of(i) at least once every four business days or (ii) at least once every five business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted on the next business day; and (2) Representative inspections used by utility line installation, pipeline construction, or other similar linear construction activities shall inspect all outfalls discharging to surface waters identified as impaired or for which a TMDL wasteload allocation has been established and approved prior to the term of this general permit. 5. Exceptional waters limitation. Discharges of stormwater from construction activities not previously covered under the general permit issued in 2009 to exceptional waters identified in 9VAC25-260-30 A 3 c are not eligible for coverage under this general permit unless the operator implements the following: New a. The exceptional water(s)shall be identified in the SWPPP; b. Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site; c. Nutrients shall be applied in accordance with manufacturer's recommendations or an approved nutrient management plan and shall not be applied during rainfall events; and d. The applicable SWPPP inspection requirements specified in Part II F 2 shall be amended as follows: (1) Inspections shall be conducted at a frequency of(i) at least once every four business days or (ii) at least once every five business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted on the next business day; and (2) Representative inspections used by utility line installation, pipeline construction, or other similar linear construction activities shall inspect all outfalls discharging to exceptional waters. 6. There shall be no discharge of floating solids or visible foam in other than trace amounts. C. Commingled discharges. Discharges authorized by this general permit may be commingled with other sources of stormwater that are not required to be covered under a state permit, so long as the commingled discharge is in compliance with this general permit. Discharges authorized by a separate state or VPDES permit may be commingled with discharges authorized by this general permit so long as all such discharges comply with all applicable state and VPDES permit requirements. General Permit No.: VAR10 Page 3 of 21 Igoe D. Prohibition of nonstormwater discharges. Except as provided in Parts I A 2, I C, and I E, all discharges covered by this general permit shall be composed entirely of stormwater associated with construction activities.All other discharges including the following are prohibited: 1. Wastewater from washout of concrete; 2. Wastewater from the washout and cleanout of stucco, paint, form release oils, curing compounds, and other construction materials; 3. Fuels, oils, or other pollutants used in vehicle and equipment operation and maintenance; 4. Oils, toxic substances, or hazardous substances from spills or other releases; and 5. Soaps, solvents, or detergents used in equipment and vehicle washing. E. Authorized nonstormwater discharges. The following nonstormwater discharges from construction activities are authorized by this general permit when discharged in compliance with this general permit: 1. Discharges from firefighting activities; 2. Fire hydrant flushings; 3. Waters used to wash vehicles or equipment where soaps, solvents, or detergents have not been used and the wash water has been filtered, settled, or similarly treated prior to discharge; 4. Water used to control dust that has been filtered, settled, or similarly treated prior to discharge; 5. Potable water sources, including uncontaminated waterline flushings; 6. Routine external building wash down where soaps, solvents or detergents have not been used and the wash water has been filtered, settled, or similarly treated prior to discharge; 7. Pavement wash waters where spills or leaks of toxic or hazardous materials have not occurred (or where all spilled or leaked material has been removed prior to washing); where soaps, solvents, or detergents have not been used; and where the wash water has been filtered, settled, or similarly treated prior to discharge; 8. Uncontaminated air conditioning or compressor condensate; 9. Uncontaminated ground water or spring water; 10. Foundation or footing drains where flows are not contaminated with process materials such as solvents; 11. Uncontaminated excavation dewatering, including dewatering of trenches and excavations that have been filtered, settled, or similarly treated prior to discharge; and 12. Landscape irrigation. F. Termination of general permit coverage. 1. The operator of the construction activity shall submit a notice of termination in accordance with 9VAC25-880-60 to the VSMP authority after one or more of the following conditions have been met: 441.0 General Permit No.: VAR10 Page 4 of 21 Now a. Necessary permanent control measures included in the SWPPP for the site are in place and functioning effectively and final stabilization has been achieved on all portions of the site for which the operator is responsible. When applicable, long term responsibility and maintenance requirements shall be recorded in the local land records prior to the submission of a notice of termination; b. Another operator has assumed control over all areas of the site that have not been finally stabilized and obtained coverage for the ongoing discharge; c. Coverage under an alternative VPDES or state permit has been obtained; or d. For residential construction only, temporary soil stabilization has been completed and the residence has been transferred to the homeowner. 2. The notice of termination should be submitted no later than 30 days after one of the above conditions in subdivision 1 of this subsection is met. Authorization to discharge terminates at midnight on the date that the notice of termination is submitted for the conditions set forth in subdivisions 1 b through 1 d of this subsection. Termination of authorizations to discharge for the conditions set forth in subdivision 1 a of this subsection shall be effective upon notification from the department that the provisions of subdivision 1 a of this subsection have been met or 60 days after submittal of the notice of termination, whichever occurs first. 3. The notice of termination shall be signed in accordance with Part III K of this general permit. G. Water quality protection. 1. The operator must select, install, implement and maintain control measures as identified in the SWPPP at the construction site that minimize pollutants in the discharge as necessary to ensure that the operator's discharge does not cause or contribute to an excursion above any applicable water quality standard. 2. If it is determined by the department that the operator's discharges are causing, have reasonable potential to cause, or are contributing to an excursion above any applicable water quality standard, the department, in consultation with the VSMP authority, may take appropriate enforcement action and require the operator to: a. Modify or implement additional control measures in accordance with Part II B to adequately address the identified water quality concerns; b. Submit valid and verifiable data and information that are representative of ambient conditions and indicate that the receiving water is attaining water quality standards; or c. Submit an individual permit application in accordance with 9VAC25-870-410 B 3. All written responses required under this chapter must include a signed certification consistent with Part III K. Amor General Permit No.:VAR10 Page 5 of 21 PART II STORMWATER POLLUTION PREVENTION PLAN A stormwater pollution prevention plan (SWPPP) shall be developed prior to the submission of a registration statement and implemented for the construction activity, including any support activity, covered by this general permit. SWPPPs shall be prepared in accordance with good engineering practices. Construction activities that are part of a larger common plan of development or sale and disturb less than one acre may utilize a SWPPP template provided by the department and need not provide a separate stormwater management plan if one has been prepared and implemented for the larger common plan of development or sale. The SWPPP requirements of this general permit may be fulfilled by incorporating by reference other plans such as a spill prevention control and countermeasure (SPCC) plan developed for the site under§ 311 of the federal Clean Water Act or best management practices (BMP) programs otherwise required for the facility provided that the incorporated plan meets or exceeds the SWPPP requirements of Part II A. All plans incorporated by reference into the SWPPP become enforceable under this general permit. If a plan incorporated by reference does not contain all of the required elements of the SWPPP, the operator must develop the missing elements and include them in the SWPPP. Any operator that was authorized to discharge under the general permit issued in 2009, and that intends to continue coverage under this general permit, shall update its stormwater pollution prevention plan to comply with the requirements of this general permit no later than 60 days after the date of coverage under this general permit. A. Stormwater pollution prevention plan contents. The SWPPP shall include the following items: 1. General information. a. A signed copy of the registration statement, if required, for coverage under the general VPDES permit for discharges of stormwater from construction activities; b. Upon receipt, a copy of the notice of coverage under the general VPDES permit for discharges of stormwater from construction activities(i.e., notice of coverage letter); c. Upon receipt, a copy of the general VPDES permit for discharges of stormwater from construction activities; d. A narrative description of the nature of the construction activity, including the function of the project(e.g., low density residential, shopping mall, highway, etc.); e. A legible site plan identifying: (1) Directions of stormwater flow and approximate slopes anticipated after major grading activities; (2) Limits of land disturbance including steep slopes and natural buffers around surface waters that will not be disturbed; (3) Locations of major structural and nonstructural control measures, including sediment basins and traps, perimeter dikes, sediment barriers, and other measures intended to filter, settle, or similarly treat sediment, that will be installed between disturbed areas and the undisturbed vegetated areas in order to increase sediment removal and maximize stormwater infiltration; (4) Locations of surface waters; General Permit No.: VAR10 Page 6 of 21 r... (5) Locations where concentrated stormwater is discharged; (6) Locations of support activities, when applicable and when required by the VSMP authority, including but not limited to (i) areas where equipment and vehicle washing, wheel wash water, and other wash water is to occur; (ii) storage areas for chemicals such as acids, fuels, fertilizers, and other lawn care chemicals; (iii) concrete wash out areas; (iv) vehicle fueling and maintenance areas; (v) sanitary waste facilities, including those temporarily placed on the construction site; and (vi)construction waste storage; and (7) When applicable, the location of the on-site rain gauge or the methodology established in consultation with the VSMP authority used to identify measurable storm events for inspection purposes. 2. Erosion and sediment control plan. a. An erosion and sediment control plan approved by the VESCP authority as authorized under the Erosion and Sediment Control Regulations (9VAC25-840), an "agreement in lieu of a plan" as defined in 9VAC25-840-10 from the VESCP authority, or an erosion and sediment control plan prepared in accordance with annual standards and specifications approved by the department. Any operator proposing a new stormwater discharge from construction activities that is not required to obtain erosion and sediment control plan approval from a VESCP authority or does not adopt department-approved annual standards and specifications shall submit the erosion and sediment control plan to the department for review and approval. b. All erosion and sediment control plans shall include a statement describing the maintenance responsibilities required for the erosion and sediment controls used. c. A properly implemented approved erosion and sediment control plan, "agreement in lieu of a *••- plan," or erosion and sediment control plan prepared in accordance with department-approved annual standards and specifications,that adequately: (1) Controls the volume and velocity of stormwater runoff within the site to minimize soil erosion; (2) Controls stormwater discharges, including peak flow rates and total stormwater volume, to minimize erosion at outlets and to minimize downstream channel and stream bank erosion; (3) Minimizes the amount of soil exposed during the construction activity; (4) Minimizes the disturbance of steep slopes; (5) Minimizes sediment discharges from the site in a manner that addresses (i) the amount, frequency, intensity, and duration of precipitation; (ii) the nature of resulting stormwater runoff; and (iii) soil characteristics, including the range of soil particle sizes present on the site; (6) Provides and maintains natural buffers around surface waters, directs stormwater to vegetated areas to increase sediment removal, and maximizes stormwater infiltration, unless infeasible; (7) Minimizes soil compaction and, unless infeasible, preserves topsoil; (8) Ensures that stabilization of disturbed areas will be initiated immediately whenever any clearing, grading, excavating, or other land-disturbing activities have permanently ceased on any portion of the site, or temporarily ceased on any portion of the site and will not resume for a period exceeding 14 days; and General Permit No.: VAR10 Page 7 of 21 (9) Utilizes outlet structures that withdraw stormwater from the surface (i.e., above the , permanent pool or wet storage water surface elevation), unless infeasible, when discharging from sediment basins or sediment traps. 3. Stormwater management plan. a. New construction activities. A stormwater management plan approved by the VSMP authority as authorized under the Virginia Stormwater Management Program (VSMP) Regulation (9VAC25- 870), or an "agreement in lieu of a stormwater management plan" as defined in 9VAC25-870-10 from the VSMP authority, or a stormwater management plan prepared in accordance with annual standards and specifications approved by the department. Any operator proposing a new stormwater discharge from construction activities that is not required to obtain stormwater management plan approval from a VSMP authority or does not adopt department-approved annual standards and specifications shall submit the stormwater management plan to the department for review and approval. b. Existing construction activities. Any operator that was authorized to discharge under the general permit issued in 2009, and that intends to continue coverage under this general permit, shall ensure compliance with the requirements of 9VAC25-870-93 through 9VAC25-870-99 of the VSMP Regulation, including but not limited to the water quality and quantity requirements. The SWPPP shall include a description of, and all necessary calculations supporting, all post- construction stormwater management measures that will be installed prior to the completion of the construction process to control pollutants in stormwater discharges after construction operations have been completed. Structural measures should be placed on upland soils to the degree possible. Such measures must be designed and installed in accordance with applicable VESCP authority, VSMP authority, state, and federal requirements, and any necessary permits must be obtained. 4. Pollution prevention plan. A pollution prevention plan that addresses potential pollutant-generating r+`' activities that may reasonably be expected to affect the quality of stormwater discharges from the construction activity, including any support activity. The pollution prevention plan shall: a. Identify the potential pollutant-generating activities and the pollutant that is expected to be exposed to stormwater; b. Describe the location where the potential pollutant-generating activities will occur, or if identified on the site plan, reference the site plan; c. Identify all nonstormwater discharges, as authorized in Part I E of this general permit, that are or will be commingled with stormwater discharges from the construction activity, including any applicable support activity; d. Identify the person responsible for implementing the pollution prevention practice or practices for each pollutant-generating activity(if other than the person listed as the qualified personnel); e. Describe the pollution prevention practices and procedures that will be implemented to: (1) Prevent and respond to leaks, spills, and other releases including (i) procedures for expeditiously stopping, containing, and cleaning up spills, leaks, and other releases; and (ii) procedures for reporting leaks, spills, and other releases in accordance with Part III G; (2) Prevent the discharge of spilled and leaked fuels and chemicals from vehicle fueling and maintenance activities (e.g., providing secondary containment such as spill berms, decks, spill containment pallets, providing cover where appropriate, and having spill kits readily available); General Permit No.: VAR10 Page 8 of 21 (3) Prevent the discharge of soaps, solvents, detergents, and wash water from construction materials, including the clean-up of stucco, paint, form release oils, and curing compounds (e.g., providing (i) cover (e.g., plastic sheeting or temporary roofs) to prevent contact with stormwater; (ii) collection and proper disposal in a manner to prevent contact with stormwater; and (iii) a similarly effective means designed to prevent discharge of these pollutants); (4) Minimize the discharge of pollutants from vehicle and equipment washing, wheel wash water, and other types of washing (e.g., locating activities away from surface waters and stormwater inlets or conveyance and directing wash waters to sediment basins or traps, using filtration devices such as filter bags or sand filters, or using similarly effective controls); (5) Direct concrete wash water into a leak-proof container or leak-proof settling basin. The container or basin shall be designed so that no overflows can occur due to inadequate sizing or precipitation. Hardened concrete wastes shall be removed and disposed of in a manner consistent with the handling of other construction wastes. Liquid concrete wastes shall be removed and disposed of in a manner consistent with the handling of other construction wash waters and shall not be discharged to surface waters; (6) Minimize the discharge of pollutants from storage, handling, and disposal of construction products, materials, and wastes including (i) building products such as asphalt sealants, copper flashing, roofing materials, adhesives, and concrete admixtures; (ii) pesticides, herbicides, insecticides, fertilizers, and landscape materials; and (iii) construction and domestic wastes such as packaging materials, scrap construction materials, masonry products, timber, pipe and electrical cuttings, plastics, Styrofoam, concrete, and other trash or building materials; (7) Prevent the discharge of fuels, oils, and other petroleum products, hazardous or toxic wastes, and sanitary wastes; and (8) Address any other discharge from the potential pollutant-generating activities not addressed above; and f. Describe procedures for providing pollution prevention awareness of all applicable wastes, including any wash water, disposal practices, and applicable disposal locations of such wastes, to personnel in order to comply with the conditions of this general permit. The operator shall implement the procedures described in the SWPPP. 5. SWPPP requirements for discharges to impaired waters, surface waters with an applicable TMDL wasteload allocation established and approved prior to the term of this general permit, and exceptional waters. The SWPPP shall: a. Identify the impaired water(s), approved TMDL(s), pollutant(s) of concern, and exceptional waters identified in 9VAC25-260-30 A 3 c, when applicable; b. Provide clear direction that: (1) Permanent or temporary soil stabilization shall be applied to denuded areas within seven days after final grade is reached on any portion of the site; (2) Nutrients shall be applied in accordance with manufacturer's recommendations or an approved nutrient management plan and shall not be applied during rainfall events; and (3) A modified inspection schedule shall be implemented in accordance with Part I B 4 or Part I B 5. 9r.. General Permit No.: VAR10 Page 9 of 21 6. Qualified personnel. The name, phone number, and qualifications of the qualified personnel v„0 conducting inspections required by this general permit. 7. Delegation of authority. The individuals or positions with delegated authority, in accordance with Part III K,to sign inspection reports or modify the SWPPP. 8. SWPPP signature.The SWPPP shall be signed and dated in accordance with Part Ill K. B. SWPPP amendments, modification, and updates. 1. The operator shall amend the SWPPP whenever there is a change in the design, construction, operation, or maintenance that has a significant effect on the discharge of pollutants to surface waters and that has not been previously addressed in the SWPPP. 2. The SWPPP must be amended if, during inspections or investigations by the operator's qualified personnel, or by local, state, or federal officials, it is determined that the existing control measures are ineffective in minimizing pollutants in discharges from the construction activity. Revisions to the SWPPP shall include additional or modified control measures designed and implemented to correct problems identified. If approval by the VESCP authority, VSMP authority, or department is necessary for the control measure, revisions to the SWPPP shall be completed no later than seven calendar days following approval. Implementation of these additional or modified control measures must be accomplished as described in Part II G. 3. The SWPPP must clearly identify the contractor(s) that will implement and maintain each control measure identified in the SWPPP. The SWPPP shall be amended to identify any new contractor that will implement and maintain a control measure. 4. The operator shall update the SWPPP no later than seven days following any modification to its implementation. All modifications or updates to the SWPPP shall be noted and shall include the following items: a. A record of dates when: (1) Major grading activities occur; (2) Construction activities temporarily or permanently cease on a portion of the site; and (3) Stabilization measures are initiated; b. Documentation of replaced or modified controls where periodic inspections or other information have indicated that the controls have been used inappropriately or incorrectly and where modified as soon as possible; c. Areas that have reached final stabilization and where no further SWPPP or inspection requirements apply; d. All properties that are no longer under the legal control of the operator and the dates on which the operator no longer had legal control over each property; e. The date of any prohibited discharges, the discharge volume released, and what actions were taken to minimize the impact of the release; f. Measures taken to prevent the reoccurrence of any prohibited discharge; and g. Measures taken to address any evidence identified as a result of an inspection required under Part II F. General Permit No.: VAR10 Page 10 of 21 Nape 5. Amendments, modifications, or updates to the SWPPP shall be signed in accordance with Part III K. C. Public Notification. Upon commencement of land disturbance, the operator shall post conspicuously a copy of the notice of coverage letter near the main entrance of the construction activity. For linear projects, the operator shall post the notice of coverage letter at a publicly accessible location near an active part of the construction project (e.g., where a pipeline crosses a public road). The operator shall maintain the posted information until termination of general permit coverage as specified in Part I F. D. SWPPP availability. 1. Operators with day-to-day operational control over SWPPP implementation shall have a copy of the SWPPP available at a central location on-site for use by those identified as having responsibilities under the SWPPP whenever they are on the construction site. 2. The operator shall make the SWPPP and all amendments, modifications, and updates available upon request to the department, the VSMP authority, the EPA, the VESCP authority, local government officials, or the operator of a municipal separate storm sewer system receiving discharges from the construction activity. If an on-site location is unavailable to store the SWPPP when no personnel are present, notice of the SWPPP's location must be posted near the main entrance of the construction site. 3. The operator shall make the SWPPP available for public review in an electronic format or in hard copy. Information for public access to the SWPPP shall be posted and maintained in accordance with Part II C. If not provided electronically, public access to the SWPPP may be arranged upon request at a time and at a publicly accessible location convenient to the operator or his designee but shall be no less than once per month and shall be during normal business hours. Information not required to be contained within the SWPPP by this general permit is not required to be released. Now- E. SWPPP implementation. The operator shall implement the SWPPP and subsequent amendments, modifications, and updates from commencement of land disturbance until termination of general permit coverage as specified in Part I F. 1. All control measures must be properly maintained in effective operating condition in accordance with good engineering practices and, where applicable, manufacturer specifications. If a site inspection required by Part II F identifies a control measure that is not operating effectively, corrective action(s) shall be completed as soon as practicable, but no later than seven days after discovery or a longer ' 4-period as established by the VSMP authority, to maintain the continued effectiveness of the control measures. 2. If site inspections required by Part II F identify an existing control measure that needs to be modified or if an additional control measure is necessary for any reason, implementation shall be completed prior to the next anticipated measurable storm event. If implementation prior to the next anticipated measurable storm event is impracticable, then alternative control measures shall be implemented as soon as practicable, but no later than seven days after discovery or a longer period as established by the VSMP authority. F. SWPPP Inspections. 1. Personnel responsible for on-site and off-site inspections. Inspections required by this general permit shall be conducted by the qualified personnel identified by the operator in the SWPPP. The operator is responsible for insuring that the qualified personnel conduct the inspection. 2. Inspection schedule. a. Inspections shall be conducted at a frequency of: Nkive General Permit No.: VAR10 Page 11 of 21 Ned (1) At least once every five business days; or (2) At least once every 10 business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted no later than the next business day. b. Where areas have been temporarily stabilized or land-disturbing activities will be suspended due to continuous frozen ground conditions and stormwater discharges are unlikely, the inspection frequency may be reduced to once per month. If weather conditions (such as above freezing temperatures or rain or snow events) make discharges likely, the operator shall immediately resume the regular inspection frequency. c. Representative inspections may be utilized for utility line installation, pipeline construction, or other similar linear construction activities provided that: (1) Temporary or permanent soil stabilization has been installed and vehicle access may compromise the temporary or permanent soil stabilization and potentially cause additional land disturbance increasing the potential for erosion; (2) Inspections occur on the same frequency as other construction activities; (3) Control measures are inspected along the construction site 0.25 miles above and below each access point (i.e., where a roadway, undisturbed right-of-way, or other similar feature intersects the construction activity and access does not compromise temporary or permanent soil stabilization); and (4) Inspection locations are provided in the report required by Part II F. *is 3. Inspection requirements. a. As part of the inspection, the qualified personnel shall: (1) Record the date and time of the inspection and when applicable the date and rainfall amount of the last measurable storm event; (2) Record the information and a description of any discharges occurring at the time of the inspection; (3) Record any land-disturbing activities that have occurred outside of the approved erosion and sediment control plan; (4) Inspect the following for installation in accordance with the approved erosion and sediment control plan, identification of any maintenance needs, and evaluation of effectiveness in minimizing sediment discharge, including whether the control has been inappropriately or incorrectly used: (a) All perimeter erosion and sediment controls, such as silt fence; (b) Soil stockpiles, when applicable, and borrow areas for stabilization or sediment trapping measures; (c) Completed earthen structures, such as dams, dikes, ditches, and diversions for stabilization; General Permit No.: VAR10 Page 12 of 21 (d) Cut and fill slopes; (e) Sediment basins and traps, sediment barriers, and other measures installed to control sediment discharge from stormwater; (f) Temporary or permanent channel, flume, or other slope drain structures installed to convey concentrated runoff down cut and fill slopes; (g) Storm inlets that have been made operational to ensure that sediment laden stormwater does not enter without first being filtered or similarly treated; and (h) Construction vehicle access routes that intersect or access paved roads for minimizing sediment tracking; (5) Inspect areas that have reached final grade or that will remain dormant for more than 14 days for initiation of stabilization activities; (6) Inspect areas that have reached final grade or that will remain dormant for more than 14 days for completion of stabilization activities within seven days of reaching grade or stopping work; (7) Inspect for evidence that the approved erosion and sediment control plan, "agreement in lieu of a plan," or erosion and sediment control plan prepared in accordance with department- approved annual standards and specifications has not been properly implemented. This includes but is not limited to: (a) Concentrated flows of stormwater in conveyances such as rills, rivulets or channels that have not been filtered, settled, or similarly treated prior to discharge, or evidence thereof; �.- (b) Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; (c) Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance, or inadequate design are considered unprotected; (d) Sediment deposition on any property (including public and private streets) outside of the construction activity covered by this general permit; (e) Required stabilization has not been initiated or completed on portions of the site; (f) Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; (g) Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and (h) Land disturbance outside of the approved area to be disturbed; (8) Inspect pollutant generating activities identified in the pollution prevention plan for the proper implementation, maintenance and effectiveness of the procedures and practices; (9) Identify any pollutant generating activities not identified in the pollution prevention plan; and General Permit No.: VAR10 Page 13 of 21 (10) Identify and document the presence of any evidence of the discharge of pollutants prohibited by this general permit. 4. Inspection report. Each inspection report shall include the following items: a. The date and time of the inspection and when applicable, the date and rainfall amount of the last measurable storm event; b. Summarized findings of the inspection; c. The location(s)of prohibited discharges; d. The location(s)of control measures that require maintenance; e. The location(s) of control measures that failed to operate as designed or proved inadequate or inappropriate for a particular location; f. The location(s)where any evidence identified under Part II F 3 a(7)exists; g. The location(s) where any additional control measure is needed that did not exist at the time of inspection; h. A list of corrective actions required (including any changes to the SWPPP that are necessary) as a result of the inspection or to maintain permit compliance; i. Documentation of any corrective actions required from a previous inspection that have not been implemented; and j. The date and signature of the qualified personnel and the operator or its duly authorized `440' representative. The inspection report and any actions taken in accordance with Part II must be retained by the operator as part of the SWPPP for at least three years from the date that general permit coverage expires or is terminated. The inspection report shall identify any incidents of noncompliance. Where an inspection report does not identify any incidents of noncompliance, the report shall contain a certification that the construction activity is in compliance with the SWPPP and this general permit. The report shall be signed in accordance with Part III K of this general permit. G. Corrective actions. 1. The operator shall implement the corrective action(s) identified as a result of an inspection as soon as practicable but no later than seven days after discovery or a longer period as approved by the VSMP authority. If approval of a corrective action by a regulatory authority (e.g., VSMP authority, VESCP authority, or the department) is necessary, additional control measures shall be implemented to minimize pollutants in stormwater discharges until such approvals can be obtained. 2. The operator may be required to remove accumulated sediment deposits located outside of the construction activity covered by this general permit as soon as practicable in order to minimize environmental impacts. The operator shall notify the VSMP authority and the department as well as obtain all applicable federal, state, and local authorizations, approvals, and permits prior to the removal of sediments accumulated in surface waters including wetlands. General Permit No.: VAR10 Page 14 of 21 ,�,,, PART III CONDITIONS APPLICABLE TO ALL VPDES PERMITS NOTE: Discharge monitoring is not required for this general permit. If the operator chooses to monitor stormwater discharges or control measures, the operator must comply with the requirements of subsections A, B, and C, as appropriate. A. Monitoring. 1. Samples and measurements taken for the purpose of monitoring shall be representative of the monitoring activity. 2. Monitoring shall be conducted according to procedures approved under 40 CFR Part 136 or alternative methods approved by the U.S. Environmental Protection Agency, unless other procedures have been specified in this general permit. Analyses performed according to test procedures approved under 40 CFR Part 136 shall be performed by an environmental laboratory certified under regulations adopted by the Department of General Services(1VAC30-45 or 1VAC30-46). 3. The operator shall periodically calibrate and perform maintenance procedures on all monitoring and analytical instrumentation at intervals that will ensure accuracy of measurements. B. Records. 1. Monitoring records and reports shall include: a. The date, exact place, and time of sampling or measurements; b. The individual(s)who performed the sampling or measurements; c. The date(s)and time(s) analyses were performed; d. The individual(s)who performed the analyses; e. The analytical techniques or methods used; and f. The results of such analyses. 2. The operator shall retain records of all monitoring information, including all calibration and maintenance records and all original strip chart recordings for continuous monitoring instrumentation, copies of all reports required by this general permit, and records of all data used to complete the registration statement for this general permit, for a period of at least three years from the date of the sample, measurement, report or request for coverage. This period of retention shall be extended automatically during the course of any unresolved litigation regarding the regulated activity or regarding control standards applicable to the operator, or as requested by the board. C. Reporting monitoring results. 1. The operator shall update the SWPPP to include the results of the monitoring as may be performed in accordance with this general permit, unless another reporting schedule is specified elsewhere in this general permit. 2. Monitoring results shall be reported on a discharge monitoring report (DMR); on forms provided, approved or specified by the department; or in any format provided that the date, location, parameter, method, and result of the monitoring activity are included. General Permit No.:VAR10 Page 15 of 21 3. If the operator monitors any pollutant specifically addressed by this general permit more frequently .- than required by this general permit using test procedures approved under 40 CFR Part 136 or using other test procedures approved by the U.S. Environmental Protection Agency or using procedures specified in this general permit, the results of this monitoring shall be included in the calculation and reporting of the data submitted in the DMR or reporting form specified by the department. 4. Calculations for all limitations which require averaging of measurements shall utilize an arithmetic mean unless otherwise specified in this general permit. D. Duty to provide information. The operator shall furnish, within a reasonable time, any information which the board may request to determine whether cause exists for modifying, revoking and reissuing, or terminating this general permit or to determine compliance with this general permit. The board, department, EPA, or VSMP authority may require the operator to furnish, upon request, such plans, specifications, and other pertinent information as may be necessary to determine the effect of the wastes from his discharge on the quality of surface waters, or such other information as may be necessary to accomplish the purposes of the CWA and the Virginia Stormwater Management Act. The operator shall also furnish to the board, department, EPA, or VSMP authority, upon request, copies of records required to be kept by this general permit. E. Compliance schedule reports. Reports of compliance or noncompliance with, or any progress reports on, interim and final requirements contained in any compliance schedule of this general permit shall be submitted no later than 14 days following each schedule date. F. Unauthorized stormwater discharges. Pursuant to § 62.1-44.5 of the Code of Virginia, except in compliance with a state permit issued by the department, it shall be unlawful to cause a stormwater discharge from a construction activity. G. Reports of unauthorized discharges. Any operator who discharges or causes or allows a discharge of sewage, industrial waste, other wastes or any noxious or deleterious substance or a hazardous - substance or oil in an amount equal to or in excess of a reportable quantity established under either 40 CFR Part 110, 40 CFR Part 117, 40 CFR Part 302, or§62.1-44.34:19 of the Code of Virginia that occurs during a 24-hour period into or upon surface waters or who discharges or causes or allows a discharge that may reasonably be expected to enter surface waters, shall notify the Department of Environmental Quality of the discharge immediately upon discovery of the discharge, but in no case later than within 24 hours after said discovery. A written report of the unauthorized discharge shall be submitted to the department and the VSMP authority within five days of discovery of the discharge. The written report shall contain: 1. A description of the nature and location of the discharge; 2. The cause of the discharge; 3. The date on which the discharge occurred; 4. The length of time that the discharge continued; 5. The volume of the discharge; 6. If the discharge is continuing, how long it is expected to continue; 7. If the discharge is continuing,what the expected total volume of the discharge will be; and 8. Any steps planned or taken to reduce, eliminate and prevent a recurrence of the present discharge or any future discharges not authorized by this general permit. General Permit No.: VAR10 Page 16 of 21 `No, Discharges reportable to the department and the VSMP authority under the immediate reporting requirements of other regulations are exempted from this requirement. H. Reports of unusual or extraordinary discharges. If any unusual or extraordinary discharge including a "bypass" or"upset," as defined herein, should occur from a facility and the discharge enters or could be expected to enter surface waters, the operator shall promptly notify, in no case later than within 24 hours, the department and the VSMP authority by telephone after the discovery of the discharge. This notification shall provide all available details of the incident, including any adverse effects on aquatic life and the known number of fish killed. The operator shall reduce the report to writing and shall submit it to the department and the VSMP authority within five days of discovery of the discharge in accordance with Part III 12. Unusual and extraordinary discharges include but are not limited to any discharge resulting from: 1. Unusual spillage of materials resulting directly or indirectly from processing operations; 2. Breakdown of processing or accessory equipment; 3. Failure or taking out of service of some or all of the facilities; and 4. Flooding or other acts of nature. I. Reports of noncompliance. The operator shall report any noncompliance which may adversely affect surface waters or may endanger public health. 1. An oral report to the department and the VSMP authority shall be provided within 24 hours from the time the operator becomes aware of the circumstances. The following shall be included as information that shall be reported within 24 hours under this subdivision: a. Any unanticipated bypass; and b. Any upset that causes a discharge to surface waters. 2. A written report shall be submitted within five days and shall contain: a. A description of the noncompliance and its cause; b. The period of noncompliance, including exact dates and times, and if the noncompliance has not been corrected, the anticipated time it is expected to continue; and c. Steps taken or planned to reduce, eliminate, and prevent reoccurrence of the noncompliance. The department may waive the written report on a case-by-case basis for reports of noncompliance under Part III I if the oral report has been received within 24 hours and no adverse impact on surface waters has been reported. 3. The operator shall report all instances of noncompliance not reported under Part III 11 or 2 in writing as part of the SWPPP. The reports shall contain the information listed in Part III 12. NOTE: The reports required in Part III G, H and I shall be made to the department and the VSMP authority. Reports may be made by telephone, email, or by fax. For reports outside normal working hours, leaving a recorded message shall fulfill the immediate reporting requirement. For emergencies, the Virginia Department of Emergency Management maintains a 24-hour telephone service at 1-800-468- 8892. General Permit No.: VAR10 Page 17 of 21 4. Where the operator becomes aware of a failure to submit any relevant facts, or submittal of incorrect ‘4401 information in any report, including a registration statement, to the department or the VSMP authority, the operator shall promptly submit such facts or correct information. J. Notice of planned changes. 1. The operator shall give notice to the department and the VSMP authority as soon as possible of any planned physical alterations or additions to the permitted facility or activity. Notice is required only when: a. The operator plans an alteration or addition to any building, structure, facility, or installation that may meet one of the criteria for determining whether a facility is a new source in 9VAC25-870- 420; b. The operator plans an alteration or addition that would significantly change the nature or increase the quantity of pollutants discharged. This notification applies to pollutants that are not subject to effluent limitations in this general permit; or 2. The operator shall give advance notice to the department and VSMP authority of any planned changes in the permitted facility or activity, which may result in noncompliance with state permit requirements. K. Signatory requirements. 1. Registration statement.All registration statements shall be signed as follows: a. For a corporation: by a responsible corporate officer. For the purpose of this chapter, a responsible corporate officer means: (i) a president, secretary, treasurer, or vice-president of the corporation in charge of a principal business function, or any other person who performs similar Nisof policy-making or decision-making functions for the corporation; or(ii)the manager of one or more manufacturing, production, or operating facilities, provided the manager is authorized to make management decisions that govern the operation of the regulated facility including having the explicit or implicit duty of making major capital investment recommendations, and initiating and directing other comprehensive measures to assure long-term compliance with environmental laws and regulations; the manager can ensure that the necessary systems are established or actions taken to gather complete and accurate information for state permit application requirements; and where authority to sign documents has been assigned or delegated to the manager in accordance with corporate procedures; b. For a partnership or sole proprietorship: by a general partner or the proprietor, respectively; or c. For a municipality, state, federal, or other public agency: by either a principal executive officer or ranking elected official. For purposes of this chapter, a principal executive officer of a public agency includes: (i) the chief executive officer of the agency or (ii) a senior executive officer having responsibility for the overall operations of a principal geographic unit of the agency. 2. Reports, etc. All reports required by this general permit, including SWPPPs, and other information requested by the board or the department shall be signed by a person described in Part Ill K 1 or by a duly authorized representative of that person.A person is a duly authorized representative only if: a. The authorization is made in writing by a person described in Part III K 1; b. The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the operator. (A duly authorized , General Permit No.: VAR10 Page 18 of 21 representative may thus be either a named individual or any individual occupying a named position); and • c. The signed and dated written authorization is included in the SWPPP. A copy must be provided to the department and VSMP authority, if requested. 3. Changes to authorization. If an authorization under Part III K 2 is no longer accurate because a different individual or position has responsibility for the overall operation of the construction activity, a new authorization satisfying the requirements of Part III K 2 shall be submitted to the VSMP authority as the administering entity for the board prior to or together with any reports or information to be signed by an authorized representative. 4. Certification. Any person signing a document under Part III K 1 or 2 shall make the following certification: "I certify under penalty of law that I have read and understand this document and that this document and all attachments were prepared in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." L. Duty to comply. The operator shall comply with all conditions of this general permit. Any state permit noncompliance constitutes a violation of the Virginia Stormwater Management Act and the Clean Water Act, except that noncompliance with certain provisions of this general permit may constitute a violation of the Virginia Stormwater Management Act but not the Clean Water Act. Permit noncompliance is grounds for enforcement action; for state permit termination, revocation and reissuance, or modification; or denial Now of a state permit renewal application. The operator shall comply with effluent standards or prohibitions established under§ 307(a) of the Clean Water Act for toxic pollutants within the time provided in the regulations that establish these standards or prohibitions or standards for sewage sludge use or disposal, even if this general permit has not yet been modified to incorporate the requirement. M. Duty to reapply. If the operator wishes to continue an activity regulated by this general permit after the expiration date of this general permit, the operator shall submit a new registration statement at least 90 days before the expiration date of the existing general permit, unless permission for a later date has been granted by the board. The board shall not grant permission for registration statements to be submitted later than the expiration date of the existing general permit. N. Effect of a state permit. This general permit does not convey any property rights in either real or personal property or any exclusive privileges, nor does it authorize any injury to private property or invasion of personal rights, or any infringement of federal, state or local law or regulations. O. State law. Nothing in this general permit shall be construed to preclude the institution of any legal action under, or relieve the operator from any responsibilities, liabilities, or penalties established pursuant to any other state law or regulation or under authority preserved by§ 510 of the Clean Water Act. Except as provided in general permit conditions on "bypassing" (Part III U) and "upset" (Part III V), nothing in this general permit shall be construed to relieve the operator from civil and criminal penalties for noncompliance. P. Oil and hazardous substance liability. Nothing in this general permit shall be construed to preclude the institution of any legal action or relieve the operator from any responsibilities, liabilities, or penalties to which the operator is or may be subject under§§62.1-44.34:14 through 62.1-44.34:23 of the State Water Control Law or§ 311 of the Clean Water Act. General Permit No.: VAR10 Page 19of21 Q. Proper operation and maintenance. The operator shall at all times properly operate and maintain all v facilities and systems of treatment and control (and related appurtenances), which are installed or used by the operator to achieve compliance with the conditions of this general permit. Proper operation and maintenance also includes effective plant performance, adequate funding, adequate staffing, and adequate laboratory and process controls, including appropriate quality assurance procedures. This provision requires the operation of back-up or auxiliary facilities or similar systems, which are installed by the operator only when the operation is necessary to achieve compliance with the conditions of this general permit. R. Disposal of solids or sludges. Solids, sludges or other pollutants removed in the course of treatment or management of pollutants shall be disposed of in a manner so as to prevent any pollutant from such materials from entering surface waters and in compliance with all applicable state and federal laws and regulations. S. Duty to mitigate. The operator shall take all steps to minimize or prevent any discharge in violation of this general permit that has a reasonable likelihood of adversely affecting human health or the environment. T. Need to halt or reduce activity not a defense. It shall not be a defense for an operator in an enforcement action that it would have been necessary to halt or reduce the permitted activity in order to maintain compliance with the conditions of this general permit. U. Bypass. 1. "Bypass," as defined in 9VAC25-870-10, means the intentional diversion of waste streams from any portion of a treatment facility. The operator may allow any bypass to occur that does not cause effluent limitations to be exceeded, but only if it also is for essential maintenance to ensure efficient operation. These bypasses are not subject to the provisions of Part III U 2 and 3. Nuit 2. Notice. a. Anticipated bypass. If the operator knows in advance of the need for a bypass, the operator shall submit prior notice to the department, if possible at least 10 days before the date of the bypass. b. Unanticipated bypass. The operator shall submit notice of an unanticipated bypass as required in Part III I. 3. Prohibition of bypass. a. Except as provided in Part III U 1, bypass is prohibited, and the board or department may take enforcement action against an operator for bypass unless: (1) Bypass was unavoidable to prevent loss of life, personal injury, or severe property damage. Severe property damage means substantial physical damage to property, damage to the treatment facilities that causes them to become inoperable, or substantial and permanent loss of natural resources that can reasonably be expected to occur in the absence of a bypass. Severe property damage does not mean economic loss caused by delays in production; (2) There were no feasible alternatives to the bypass, such as the use of auxiliary treatment facilities, retention of untreated wastes, or maintenance during normal periods of equipment downtime. This condition is not satisfied if adequate back-up equipment should have been installed in the exercise of reasonable engineering judgment to prevent a bypass that occurred during normal periods of equipment downtime or preventive maintenance; and (3) The operator submitted notices as required under Part III U 2. General Permit No.: VAR10 Page 20 of 21 b. The department may approve an anticipated bypass, after considering its adverse effects, if the department determines that it will meet the three conditions listed in Part III U 3 a. V. Upset. 1. An "upset," as defined in 9VAC25-870-10, means an exceptional incident in which there is unintentional and temporary noncompliance with technology-based state permit effluent limitations because of factors beyond the reasonable control of the operator. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventive maintenance, or careless or improper operation. 2. An upset constitutes an affirmative defense to an action brought for noncompliance with technology- based state permit effluent limitations if the requirements of Part III V 4 are met. A determination made during administrative review of claims that noncompliance was caused by upset, and before an action for noncompliance, is not a final administrative action subject to judicial review. 3. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventative maintenance, or careless or improper operation. 4. An operator who wishes to establish the affirmative defense of upset shall demonstrate, through properly signed, contemporaneous operating logs or other relevant evidence that: a. An upset occurred and that the operator can identify the cause(s)of the upset; b. The permitted facility was at the time being properly operated; c. The operator submitted notice of the upset as required in Part III I; and d. The operator complied with any remedial measures required under Part III S. 5. In any enforcement proceeding, the operator seeking to establish the occurrence of an upset has the burden of proof. W. Inspection and entry. The operator shall allow the department as the board's designee, the VSMP authority, EPA, or an authorized representative of either entity (including an authorized contractor), upon presentation of credentials and other documents as may be required by law to: 1. Enter upon the operator's premises where a regulated facility or activity is located or conducted, or where records must be kept under the conditions of this general permit; 2. Have access to and copy, at reasonable times, any records that must be kept under the conditions of this general permit; 3. Inspect and photograph at reasonable times any facilities, equipment (including monitoring and control equipment), practices, or operations regulated or required under this general permit; and 4. Sample or monitor at reasonable times, for the purposes of ensuring state permit compliance or as otherwise authorized by the Clean Water Act or the Virginia Stormwater Management Act, any substances or parameters at any location. For purposes of this section, the time for inspection shall be deemed reasonable during regular business hours, and whenever the facility is discharging. Nothing contained herein shall make an inspection unreasonable during an emergency. General Permit No.: VAR10 Page 21 of 21 X. State permit actions. State permits may be modified, revoked and reissued, or terminated for cause. The filing of a request by the operator for a state permit modification, revocation and reissuance, or termination, or a notification of planned changes or anticipated noncompliance does not stay any state permit condition. Y. Transfer of state permits. 1. State permits are not transferable to any person except after notice to the department. Except as provided in Part Ill Y 2, a state permit may be transferred by the operator to a new operator only if the state permit has been modified or revoked and reissued, or a minor modification made, to identify the new operator and incorporate such other requirements as may be necessary under the Virginia Stormwater Management Act and the Clean Water Act. 2. As an alternative to transfers under Part Ill Y 1, this state permit may be automatically transferred to a new operator if: a. The current operator notifies the department at least 30 days in advance of the proposed transfer of the title to the facility or property; b. The notice includes a written agreement between the existing and new operators containing a specific date for transfer of state permit responsibility, coverage, and liability between them; and c. The department does not notify the existing operator and the proposed new operator of its intent to modify or revoke and reissue the state permit. If this notice is not received, the transfer is effective on the date specified in the agreement mentioned in Part Ill Y 2 b. 3. For ongoing construction activity involving a change of operator, the new operator shall accept and maintain the existing SWPPP, or prepare and implement a new SWPPP prior to taking over operations at the site. `•die Z. Severability. The provisions of this general permit are severable, and if any provision of this general permit or the application of any provision of this state permit to any circumstance, is held invalid, the application of such provision to other circumstances and the remainder of this general permit shall not be affected thereby. Section 12. Inspection Logs ``"` (Provide templates for your inspections. Requirements are listed in 9VAC25-880-70, Part II, section B and F.) Reports summarizing each inspection shall be incorporated by reference and retained as part of this SWPPP. A copy of an example inspection report is provided in Section 12 of this SWPPP. Inspection Schedule Inspections shall be conducted at a frequency of(check one box below for project inspection frequency): (1) At least once every four (4)business days or (2) At least once every five business days and no later than 48 hours following a measurable storm event. In the event that a measurable storm event occurs when there are more than 48 hours between business days, the inspection shall be conducted on the next business day; and • Representative inspections used by utility line installation,pipeline construction, or other similar linear construction activities shall inspect all outfalls discharging to surface waters identified as impaired or for which a TMDL wasteload allocation has *6..., been established and approved prior to the term of the general permit. Representative inspections may be utilized for utility line installation, pipeline construction, or other similar linear construction activities provided that: (1) Temporary or permanent soil stabilization has been installed and vehicle access may compromise the temporary or permanent soil stabilization and potentially cause additional land disturbance increasing the potential for erosion; (2) Inspections occur on the same frequency as other construction activities; (3) Control measures are inspected along the construction site 0.25 miles above and below each access point(i.e.,where a roadway, undisturbed right-of-way, or other similar feature intersects the construction activity and access does not compromise temporary or permanent soil stabilization); and (4) Inspection locations are provided in the report required by Part II F (of the CGP). Where areas have been temporarily stabilized or land-disturbing activities will be suspended due to continuous frozen ground conditions and stormwater discharges are unlikely, the inspection frequency may be reduced to once per month. If weather conditions (such as above freezing temperatures or rain or snow events) make discharges likely, the operator shall immediately resume the regular inspection frequency. Issued— 10/2014 Stormwater Pollution Prevention Plan (SWPPP) Albemarle County 440 vei 1100 Inspection Requirements As part of the inspection, the qualified personnel shall: (1) Record the date and time of the inspection and when applicable the date and rainfall amount of the last measurable storm event; (2) Record the information and a description of any discharges occurring at the time of the inspection; (3) Record any land-disturbing activities that have occurred outside of the approved erosion and sediment control plan; (4) Inspect the following for installation in accordance with the approved erosion and sediment control plan, identification of any maintenance needs, and evaluation of effectiveness in minimizing sediment discharge, including whether the control has been inappropriately or incorrectly used: (a) All perimeter erosion and sediment controls, such as silt fence; (b) Soil stockpiles, when applicable, and borrow areas for stabilization or sediment trapping measures; (c) Completed earthen structures, such as dams, dikes, ditches, and diversions for stabilization; (d) Cut and fill slopes; (e) Sediment basins and traps, sediment barriers, and other measures installed to control sediment discharge from stormwater; (f) Temporary or permanent channel, flume, or other slope drain structures installed to convey concentrated runoff down cut and fill slopes;(g) Storm inlets that have been made operational to ensure that sediment laden stormwater does not enter without first being filtered or similarly treated; and (h) Construction vehicle access routes that intersect or access paved roads for minimizing sediment tracking; (5) Inspect areas that have reached final grade or that will remain dormant for more than 14 days for initiation of stabilization activities; (6) Inspect areas that have reached final grade or that will remain dormant for more than 14 days for completion of stabilization activities within seven days of reaching grade or stopping work; (7) Inspect for evidence that the approved erosion and sediment control plan, "agreement in lieu of a plan," or erosion and sediment control plan prepared in accordance with department-approved annual standards and specifications has not been properly implemented. This includes but is not limited to: Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County v.00 (a) Concentrated flows of stormwater in conveyances such as rills, rivulets or channels that have not been filtered, settled, or similarly treated prior to discharge , or evidence thereof; (b) Sediment laden or turbid flows of stormwater that have not been filtered or settled to remove sediments prior to discharge; (c) Sediment deposition in areas that drain to unprotected stormwater inlets or catch basins that discharge to surface waters. Inlets and catch basins with failing sediments controls due to improper installation, lack of maintenance, or inadequate design are considered unprotected; (d) Sediment deposition on any property (including public and private streets) outside of the construction activity covered by the general permit; (e) Required stabilization has not been initiated or completed on portions of the site; (f) Sediment basins without adequate wet or dry storage volume or sediment basins that allow the discharge of stormwater from below the surface of the wet storage portion of the basin; (g) Sediment traps without adequate wet or dry storage or sediment traps that allow the discharge of stormwater from below the surface of the wet storage portion of the trap; and NINorr (h) Land disturbance outside of the approved area to be disturbed; (8) Inspect pollutant generating activities identified in the pollution prevention plan for the proper implementation, maintenance and effectiveness of the procedures and practices; (9) Identify any pollutant generating activities not identified in the pollution prevention plan; and (10) Identify and document the presence of any evidence of the discharge of pollutants prohibited by the general permit. Inspection Report Each inspection report shall include the following items: a. The date and time of the inspection and when applicable,the date and rainfall amount of the last measurable storm event; b. Summarized findings of the inspection; c. The location(s) of prohibited discharges; d. The location(s) of control measures that require maintenance; N`"' e. The location(s) of control measures that failed to operate as designed or proved inadequate or inappropriate for a particular location; Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County N•1100 f. The location(s) where any evidence identified under Part II F 3 a(7) (of the CGP) exists; g. The location(s) where any additional control measure is needed that did not exist at the time of inspection; h. A list of corrective actions required (including any changes to the SWPPP that are necessary) as a result of the inspection or to maintain permit compliance; i. Documentation of any corrective actions required from a previous inspection that have not been implemented; and j. The date and signature of the qualified personnel and the operator or its duly authorized representative. The inspection report and any actions taken in accordance with Part II (of the CGP) must be retained by the operator as part of the SWPPP for at least three years from the date that general permit coverage expires or is terminated. The inspection report shall identify any incidents of noncompliance. Where an inspection report does not identify any incidents of noncompliance, the report shall contain a certification that the construction activity is in compliance with the SWPPP and the general permit. The report shall be signed in accordance with Part III K of the general permit. Rainfall Tracking For the purposes of tracking measurable rain events, the operator will reference a rain gauge accessible to inspection staff at the project site or at another local site representative of the project location. A blank precipitation log is provided (in Section 12 of this SWPPP) if an onsite rain gauge will be used. If a rain gauge is not used, rainfall tracking will be monitored through either an onsite rain gauge or using one of the following links: o http://water.weather.gov/precip/ o http://www.nc-climate.ncsu.edu/cronos/ o http://www.ncdc.noaa.gov/cdo-web/ Reports summarizing each inspection shall be incorporated by reference and retained as part of this SWPPP. Corrective Action Personnel Responsible for Corrective Actions NO/ • The operator shall implement the corrective action(s) identified as a result of an inspection as soon as practicable but no later than seven days after discovery or a longer period as approved by the VSMP authority. If approval of a corrective action by Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP) Albemarle County N✓' a regulatory authority (e.g., VSMP authority, VESCP authority, or the department) is necessary, additional control measures shall be implemented to minimize pollutants in stormwater discharges until such approvals can be obtained. • The operator may be required to remove accumulated sediment deposits located outside of the construction activity covered by this general permit as soon as practicable in order to minimize environmental impacts. The operator shall notify the VSMP authority and the department as well as obtain all applicable federal, state, and local authorizations, approvals, and permits prior to the removal of sediments accumulated in surface waters including wetlands. • The contractor shall be responsible for the installation and maintenance of all erosion and sediment control practices and for corrective actions. Corrective Action Forms • A copy of an example corrective action log is provided in Appendix E of this SWPPP. • Corrective actions may be documented using the corrective action log provided in Appendix E or included within the inspection reports for the project. Copies of the inspection reports are hereby incorporated by reference as part of this SWPPP and are provided in Section 12 of this SWPPP. Issued— 10/2014 Stormwater Pollution Prevention Plan(SWPPP)Albemarle County *aro .01 `_r.. Precipitation Log Date Time Rainfall(to nearest hundredth) veld DEQ SAMPLE VSMP AUTHORITY CONSTRUCTION GENERAL PERMIT SITE INSPECTION CHECKLIST (All section references bellow are to the Construction GP 9VAC25-880-70 effective 711/14) Project Name: Permit Number: Project Address: County/City: *"" Project Operator: Operator Telephone: Operator Address: County/City: ZIP: Inspector Name: Inspection Date: Time: Yes No N/A Recommended Corrective Action/ Notes 1 Copy of notice of coverage letter posted near main entrance: Part II(C) 2 Information for public access to electronic format or hard copy of SWPPP posted near main entrance: Part II(D)3 3 Copy of complete SWPPP available onsite for operators: Part II(A) 3a Signed copy of registration statement: Part II(A)1.a 3b Copy of permit: Part II(A)1.b 3c Copy of notice of coverage letter: Part II(A)1.c 3d Narrative description of the nature of construction activity: Part II(A)1.d 3e Legible site plan: Part II(A)1.e Approved ESC plan, "agreement in lieu of a plan", or ESC plan 3f developed in accordance with department approved annual standards and specifications: Part II(A)2 Approved SWM plan or SWM plan developed in accordance with 3g department approved annual standards and specifications: Part II(A)3 3h Pollution prevention plan: Part II(A)4 3i Requirements for discharges to impaired waters,surface waters with an applicable TMDL, exceptional waters(if applicable): Part II(A)5 Contact information for qualified personnel conducting inspections: 3j Part II(A)6 3k SWPPP signed in accordance with Part III K: Part II(A)8 4 SWPPP is being amended, modified and updated: Part II(B) 4a SWPPP clearly identifies the contractor(s)that will implement and maintain each control measure identified in SWPPP: Part ll(B)3 4b Record of dates when major grading activities occurred: Part II(B)4.a(1) 4c SWPPP amendments, modifications, or updates signed in accordance with Part III K: Part 1l(B)5 5 SWPPP inspections carried out: Part II(F) 5a Inspections conducted at required frequency: Part II(F)2 5b Inspection reports summarize findings of inspections including corrective actions: Part ll(F)4.a-i Inspection reports have date and signature of qualified personnel 5c conducting inspections and the operator or authorized representative: Part II(F)4.j 5d Inspection reports retained as part of SWPPP: Part II(F)4 6 Erosion and sediment controls implemented: Part II(A)2.c 6a Volume and velocity of stormwater runoff controlled within site to minimize erosion: Part II(A)2.c(1) Stormwater discharges, including peak flow rates and total 6b stormwater volume controlled to minimize erosion at outlets and to minimize downstream channel and stream bank erosion: Part II(A)2.c(2) 6c Soil exposed during construction activity minimized: Part II(A)2.c(3) 6d Disturbance of steep slopes minimized: Part II(A)2.c(4) Natural buffers around surface waters provided and maintained, 6e stormwater directed to vegetated areas to increase sediment removal, and maximizes stormwater infiltration: Part II(A)2.c(6) 6f Soil compaction minimized and topsoil preserved: Part II(A)2.c(7) Sample VSMP Authority Construction Inspection Checklist Page 1 of 4 Stabilization of disturbed areas initiated immediately whenever any clearing,grading, or excavating,or other land-disturbing activities 6g have permanently ceased on any portion of the site, or temporarily ceased on any portion of the site and will not resume for more than 14 days: Part II(A)2.c(8) Outlet structures utilized that withdraw stormwater from the surface mid 6h when discharging from sediment basins or sediment traps: Part II(A)2.c(9) 7 Pollution prevention plan implemented: Part II(A)4 Prevent and respond to leaks, spills and other releases including(i) 7a procedures for expeditiously stopping, containing, and cleaning up spills, leaks,and other releases; and(ii)procedures for reporting leaks,spills,and other releases: Part II(A)4.e(1) Prevent discharge of spilled and leaked fuels and chemicals from vehicle fueling and maintenance activities (e.g. providing 7b secondary containment such as spill berms,decks,spill containment pallets, providing cover where appropriate, and having spill kits readily available): Part II(A)4.e(2) Prevent discharge of soaps, solvents, detergents, and wash water from construction materials, including the clean-up of stucco, paint, form release oils, and curing compounds(e.g., providing(i)cover 7c (e.g., plastic sheeting or temporary roofs)to prevent contact with stormwater;(ii)collection and proper disposal in a manner to prevent contact with stormwater;and (iii)a similarly effective means designed to prevent discharge of these pollutants): Part II(A)4.e(3) Minimize discharge of pollutants from vehicle and equipment washing,wheel wash water and other types of washing (e.g., 7d locating activities away from surface waters and stormwater inlets or conveyance and directing wash waters to sediment basins or traps, using filtration devices such as filter bags or sand filters or using similarly effective controls): Part II(A)4.e(4) Direct concrete wash water into a leak-proof container or leak-proof settling basin that is designed so that no overflows can occur due to inadequate sizing or precipitation. Hardened concrete wastes 7e shall be removed and disposed of in a manner consistent with the ` handling of other construction wastes. Liquid concrete wastes shall be removed and disposed of in a manner consistent with the handling of other construction wash waters and shall not be discharged to surface waters: Part II(A)4.e(5) Minimize discharge of pollutants from storage, handling, and disposal of construction products, materials and wastes including (i)building products such as asphalt sealants, copper flashing, roofing materials, adhesives,concrete admixtures; (ii)pesticides, 7f herbicides, insecticides,fertilizers, and landscape materials;and (iii)construction and domestic wastes such as packaging materials, scrap construction materials,masonry products,timber, pipe and electrical cuttings, plastics,styrofoam, concrete, and other trash or building materials: Part II(A)4.e(6) 7g Prevent discharge of fuels,oils, and other petroleum products, hazardous or toxic wastes,and sanitary wastes: Part II(A)4.e(7) 7h Address any other discharge from the potential pollutant-generating activities not addressed above: Part II(A)4.e(8) 8 Appears to be impact(s)to receiving waters: Part 1(B)6, Part 1(D), or Part II(A)2c(2)or(5): {Provide location(s)&description of impact(s).} `m1# Sample VSMP Authority Construction Inspection Checklist Page 2 of 4 SAMPLE VSMP CONSTRUCTION GP SITE INSPECTION CHECKLIST Project Name: Permit Number: Project Address: County/City: Inspector Name: Inspection Date: Time: STAGE OF CONSTRUCTION Pre-Construction Conference Building Construction Construction of SWM Facilities Clearing& Grubbing Finish Grading Maintenance of SWM Facilities Rough Grading Final Stabilization Other: # State Regulation(1) Description and Location of condition observecf�1, Initial Repeat Recommended Corrective Actions, and Other Comments (1) Refers to applicable regulation found in the most recent publication of the Virginia Erosion and Sediment Control Regulations(9VAC25-840),the General Permit for Discharges of Stormwater from Construction Activities(9VAC25-880),or the Virginia Stormwater Management Program Regulations (9VAC25-870). (2) Note whether or not off-site impacts resulting from the condition observed was evident during the inspection. Recommended Corrective Action Deadline: Targeted Re-inspection Date: +1-2 weeks The recommended corrective action deadline date applies to all conditions noted on this report unless otherwise noted.If listed condition(s)currently constitute non-compliance and/or corrective actions are not completed by the deadline,other enforcement actions may be issued to the entity responsible for ensuring compliance on the above project. Inspector: Signature Date Report e-mailed to Sample VSMP Authority Construction Inspection Checklist Page 3 of 4 SAMPLE VSMP CONSTRUCTION GENERAL PERMIT SITE INSPECTION CHECKLIST Photo documentation r.r, Sample VSMP Authority Construction Inspection Checklist Page 4 of 4 DEQ SAMPLE VSMP AUTHORITY CONSTRUCTION GENERAL PERMIT SITE INSPECTION CHECKLIST (All section references bellow are to the Construction GP 9VAC25-880-70 effective 7/1/14) Project Name: Permit Number: Project Address: County/City: Now, Project Operator: Operator Telephone: Operator Address: County/City: ZIP: Inspector Name: Inspection Date: Time: Yes No N/A Recommended Corrective Action/ Notes 1 Copy of notice of coverage letter posted near main entrance: Part II(C) 2 Information for public access to electronic format or hard copy of SWPPP posted near main entrance: Part II(D)3 3 Copy of complete SWPPP available onsite for operators: Part II(A) 3a Signed copy of registration statement: Part II(A)1.a 3b Copy of permit: Part II(A)1.b 3c Copy of notice of coverage letter: Part II(A)1.c 3d Narrative description of the nature of construction activity: Part II(A)1.d 3e Legible site plan: Part II(A)1.e Approved ESC plan, "agreement in lieu of a plan", or ESC plan 3f developed in accordance with department approved annual standards and specifications: Part II(A)2 Approved SWM plan or SWM plan developed in accordance with 3g department approved annual standards and specifications: Part II(A)3 3h Pollution prevention plan: Part II(A)4 3i Requirements for discharges to impaired waters, surface waters with an applicable TMDL, exceptional waters(if applicable): Part II(A)5 Contact information for qualified personnel conducting inspections: 3j Part II(A)6 3k SWPPP signed in accordance with Part III K: Part II(A)8 4 SWPPP is being amended,modified and updated: Part II(B) 4a SWPPP clearly identifies the contractor(s)that will implement and maintain each control measure identified in SWPPP: Part ll(B)3 4b Record of dates when major grading activities occurred: Part II(B)4.a(1) 4c SWPPP amendments, modifications, or updates signed in accordance with Part III K: Part ll(B)5 5 SWPPP inspections carried out: Part II(F) 5a Inspections conducted at required frequency: Part II(F)2 5b Inspection reports summarize findings of inspections including corrective actions: Part II(F)4.a-i Inspection reports have date and signature of qualified personnel 5c conducting inspections and the operator or authorized representative: Part II(F)4.j 5d Inspection reports retained as part of SWPPP: Part II(F)4 6 Erosion and sediment controls implemented: Part II(A)2.c 6a Volume and velocity of stormwater runoff controlled within site to minimize erosion: Part II(A)2.c(1) Stormwater discharges, including peak flow rates and total 6b stormwater volume controlled to minimize erosion at outlets and to minimize downstream channel and stream bank erosion: Part II(A)2.c(2) 6c Soil exposed during construction activity minimized: Part II(A)2.c(3) 6d Disturbance of steep slopes minimized: Part II(A)2.c(4) Natural buffers around surface waters provided and maintained, 6e stormwater directed to vegetated areas to increase sediment removal, and maximizes stormwater infiltration: Part II(A)2.c(6) '7 6f Soil compaction minimized and topsoil preserved: Part II(A)2.c(7) Sample VSMP Authority Construction Inspection Checklist Page 1 of 4 Stabilization of disturbed areas initiated immediately whenever any clearing,grading, or excavating,or other land-disturbing activities 6g have permanently ceased on any portion of the site, or temporarily ceased on any portion of the site and will not resume for more than 14 days: Part ll(A)2.c(8) Outlet structures utilized that withdraw stormwater from the surface vii00 6h when discharging from sediment basins or sediment traps: Part II(A)2.c(9) 7 Pollution prevention plan implemented: Part II(A)4 Prevent and respond to leaks,spills and other releases including(i) 7a procedures for expeditiously stopping,containing,and cleaning up spills, leaks,and other releases; and(ii)procedures for reporting leaks,spills,and other releases: Part II(A)4.e(1) Prevent discharge of spilled and leaked fuels and chemicals from vehicle fueling and maintenance activities (e.g.providing 7b secondary containment such as spill berms,decks,spill containment pallets, providing cover where appropriate, and having spill kits readily available): Part II(A)4.e(2) Prevent discharge of soaps, solvents,detergents,and wash water from construction materials, including the clean-up of stucco, paint, form release oils, and curing compounds(e.g.,providing(i)cover 7c (e.g., plastic sheeting or temporary roofs)to prevent contact with stormwater;(ii)collection and proper disposal in a manner to prevent contact with stormwater; and (iii)a similarly effective means designed to prevent discharge of these pollutants): Part II(A)4.e(3) Minimize discharge of pollutants from vehicle and equipment washing,wheel wash water and other types of washing (e.g., 7d locating activities away from surface waters and stormwater inlets or conveyance and directing wash waters to sediment basins or traps, using filtration devices such as filter bags or sand filters or using similarly effective controls): Part Il(A)4.e(4) Direct concrete wash water into a leak-proof container or leak-proof settling basin that is designed so that no overflows can occur due to inadequate sizing or precipitation. Hardened concrete wastes 7e shall be removed and disposed of in a manner consistent with the . handling of other construction wastes. Liquid concrete wastes shall be removed and disposed of in a manner consistent with the handling of other construction wash waters and shall not be discharged to surface waters: Part ll(A)4.e(5) Minimize discharge of pollutants from storage,handling, and disposal of construction products, materials and wastes including (i)building products such as asphalt sealants, copper flashing, roofing materials, adhesives,concrete admixtures;(ii)pesticides, 7f herbicides, insecticides,fertilizers, and landscape materials; and (iii)construction and domestic wastes such as packaging materials, scrap construction materials, masonry products,timber, pipe and electrical cuttings, plastics,styrofoam,concrete, and other trash or building materials: Part II(A)4.e(6) 7g Prevent discharge of fuels, oils, and other petroleum products, hazardous or toxic wastes, and sanitary wastes: Part 11(A)4.e(7) 7h Address any other discharge from the potential pollutant-generating activities not addressed above: Part II(A)4.e(8) 8 Appears to be impact(s)to receiving waters: Part I(B)6, Part 1(D), or Part II(A)2c(2)or(5): {Provide location(s)&description of impact(s).} Nom Sample VSMP Authority Construction Inspection Checklist Page 2 of 4 SAMPLE VSMP CONSTRUCTION GP SITE INSPECTION CHECKLIST Project Name: Permit Number: Project Address: County/City: Inspector Name: Inspection Date: Time: STAGE OF CONSTRUCTION Pre-Construction Conference Building Construction Construction of SWM Facilities Clearing& Grubbing Finish Grading Maintenance of SWM Facilities Rough Grading Final Stabilization Other: # State Regulation(1) Description and Location of condition observed/�1, Initial Repeat Recommended Corrective Actions, and Other Comments (1) Refers to applicable regulation found in the most recent publication of the Virginia Erosion and Sediment Control Regulations(9VAC25-840),the General Permit for Discharges of Stormwater from Construction Activities(9VAC25-880),or the Virginia Stormwater Management Program Regulations (9VAC25-870). (2) Note whether or not off-site impacts resulting from the condition observed was evident during the inspection. Recommended Corrective Action Deadline: Targeted Re-inspection Date: +/-2 weeks The recommended corrective action deadline date applies to all conditions noted on this report unless otherwise noted. If listed condition(s)currently constitute non-compliance and/or corrective actions are not completed by the deadline,other enforcement actions may be issued to the entity responsible for ensuring compliance on the above project. Inspector: Signature Date Report e-mailed to Sample VSMP Authority Construction Inspection Checklist Page 3 of 4 SAMPLE VSMP CONSTRUCTION GENERAL PERMIT SITE INSPECTION CHECKLIST Photo documentation No_ Sample VSMP Authority Construction Inspection Checklist Page 4 of 4 Appendix A Log of Changes and Updates to SWPPP rr0 ftrie err THIS SECTION IS PROVIDED FOR ANY UPDATES TO THE SWPPP NECESSARY BASED ON CHANGES TO THE PROJECT .1of ■mori stow,-o I ¢.H I) c E E E 0 0 I) Q a� E b E s 0 0 0 N 0 a z 0 E a 0 a � 3 ¢ vea0+' Appendix B Grading and Stabilization Activities Log rd o N ti r L cC 2 oA C O C . O cC cts a) a) a) 0 0 cct NO 0 O O •U N Q Y U O i a C.) o • O is u• • V) a� O Q w z7 V1 aq a) • cts C °..)//�� • CC U 1., Cd v Appendix C Maintenance Agreements for Stormwater Management Facilities Appendix D Spill Report Form New Spill Report Project Name: Date/Time of Spill: Location: Material Type and Volume: Cause of Spill: Corrective Action Taken: Agencies/Persons Contacted: I certify under penalty of law that I have read and understand this document and that this document and all attachments were prepared in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system,or those persons directly responsible for gathering the information,the information submitted is,to the best of my knowledge and belief,true, accurate,and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. Name: Title: Signature: Date: yr.. Appendix E Corrective Action Log • o C C) c � o 7) Q a) a act N Q1=4 bq -o U• � o a o aZ. a) . za • 3-■ •Y \ U a+ C) b > y U U _� a U ir.0° PI >, w o a O • tg a a) U Q v, C.) E z 0 U G) FA" bD � yw N cc: Q O U ✓ N • a U Appendix F Contractor/Subcontractor Certifications/Agreements Appendix G Additional Supporting Information EPA Stormwater Best Management Practice rClc „ .. United States Environmental Protection • a Agency r vo to t Shot' Construction workers should handle wet concrete and Minimum Measure washout water with care because it may cause skin irritation Construction Site Stormwater Runoff Control and eye damage. If the washwater is dumped on the ground Subcategory (Fig. 1), it can run off the construction site to adjoining roads and enter roadside storm drains, which discharge to surface Good Housekeeping/Materials Management waters such as rivers, lakes, or estuaries. The red arrow in Figure 2 points to a ready mixed truck chute that's being Description of Concrete Washout at washed out into a roll off bin, which isn't watertight. Leaking washwater, shown in the foreground, will likely follow similar Construction Sites Figure 1.Chute Concrete and its ingredients washwater being dumped on the ground Concrete is a mixture of cement,water, and aggregate material. OW Portland cement is made by heating a mixture of limestone and .j clay containing oxides of calcium, aluminum, silicon and other , a metals in a kiln and then pulverizing the resulting clinker. The — ,x ! e' fine aggregate particles are usually sand. Coarse aggregate is generally gravel or crushed stone.When cement is mixed - Y - with water, a chemical reaction called hydration occurs,which ' produces glue that binds the aggregates together to make ' concrete. t Concrete washout Figure 2.Chute After concrete is poured at a construction site, the chutes of washwater leaking from a roll-off bin being used as a ready mixed concrete trucks and hoppers of concrete pump washout container trucks must be washed out to remove the remaining concrete before it hardens. Equipment such as wheelbarrows and hand paths to nearby surface waters. Rainfall may cause concrete tools also need to be washed down. At the end of each work washout containers that are uncovered to overflow and also day, the drums of concrete trucks must be washed out. This is transport the washwater to surface waters. Rainwater polluted customarily done at the ready mixed batch plants,which are with concrete washwater can percolate down through the usually off-site facilities, however large or rural construction soil and alter the soil chemistry, inhibit plant growth, and projects may have on-site batch plants. Cementitious (having contaminate the groundwater. Its high pH can increase the properties of cement)washwater and solids also come from the toxicity of other substances in the surface waters and using such construction materials as mortar, plaster, stucco, soils. Figures 1 and 2 illustrate the need for better washout and grout. management practices. Environmental and Human Health Impacts Best Management Practice Objectives Concrete washout water (or washwater) is a slurry containing The best management practice objectives for concrete washout toxic metals. It's also caustic and corrosive, having a pH are to (a) collect and retain all the concrete washout water and near 12. In comparison, Drano liquid drain cleaner has a pH solids in leak proof containers, so that this caustic material of 13.5. Caustic washwater can harm fish gills and eyes and does not reach the soil surface and then migrate to surface interfere with reproduction. The safe pH ranges for aquatic life waters or into the ground water, and (b) recycle 100 percent Niumoihabitats are 6.5—9 for freshwater and 6.5—8.5 for saltwater. of the collected concrete washout water and solids. Another Office of Water, 4203M EPA 833-F-11-006 www.epa.gov/npdes/pubs/concretewashout.pdf February 2012 www.epa.gov/npdes/stormwater/menuofbmps Stormwater Best Management Practice: Concrete Washout objective is to support the diversion of recyclable materials from contacted to inquire landfills. Table 1 shows how concrete washout materials can be about any pretreatment recycled and reused. requirements, i.e., the National Pretreatment i -. ' , �► 1_ Table 1—Recycling concrete washout materials Standards for Prohibited ' riT -- +r . Concrete Washout Materials Dischargers (40CFR 403.5) before discharging the L q 0 0 CO washwater to the POTW. � � 0) C CDC _ 0 CM M o o The washwater can also Uses of Recycled Materials cI co c.) @ _ LI _ C.3 Figure 4.Vacuuming washwater out of a Reused to washout additional mixer be retained in the washout washout container for treatment and reuse truck chutes or drums x container and allowed to Reused as a ready mixed concrete x x° x x evaporate, leaving only the hardened cementitious solids to be ingredient Reused as an ingredient of precast recycled. concrete products,e.g.,highway x x x x x barriers,retaining wall blocks,riprap Solids recycling Reused as crushed concrete x x x x The course aggregate materials that are washed off concrete products,e.g.,road base or fill Reused to pave the yards of ready x truck chutes into a washout container can be either separated mixed concrete plants by a screen and placed in aggregate bins to be reused at Returned back to a surface water, xC- the construction site or returned to the ready mixed plant and e.g.,river,lake,or estuary a. Fine particles of cementitious material(e.g.,Portland cement,slag cement,fly ash, washed into a reclaimer (Fig. 5).When washed out into a silica fume) reclaimer, the fine and course aggregates are separated out b. Recyclable,if allowed by the concrete quality specifications and placed in different c. Treated to reduce the pH and remove metals,so it can be delivered to a municipal wastewater treatment plant,where it is treated further and then returned to a natural piles or bins to be reused surface water in making fresh concrete. - Washwater recycling treatment, disposal Reclaimers with settling c, ,` .,,, . tanks separate cement "' t;" ' M Washwater from concrete truck fines from the washwater, vie chutes, hand mixers, or other equipment can be passed through : and these fines can also be used in new concrete a system of weirs or filters to remove unless prohibited by the Figure 5.Ready mixed truck washing solids and then be reused to wash ------w_. -- user's concrete quality out into a reclaimer down more chutes and equipment : specifications. at the construction site or as an ingredient for making additional '- Hardened concrete recycling concrete. A three chamber washout _ When the washwater in a construction site concrete washout filter is shown in Figure 3.The first 's container has been removed or allowed to evaporate, the stage collects the coarse aggregate. hardened concrete that remains can be crushed (Fig. 6) The middle stage filters out the Figure 3.Concrete washout and reused as a construction material. It makes an excellent small grit and sand.The third stage filter aggregate for road base and can be used as fill at the has an array of tablets that filter construction site or out fines and reduces the pH.The filtered washwater is then nx delivered to a recycler. discharged through a filter sock. An alternative is to pump the Concrete recyclers can washout water out of the washout container (Fig 4) and treat be found at municipal the washwater off site to remove metals and reduce its pH, •' ; £ _ ;r{ --", solid waste disposal V.so it can be delivered to a publicly owned treatment works " 5 e ~ ~� ,„°� �°��'�-°" ....wMw facilities, private (POTW), also known as a municipal wastewater treatment plant, Figure which provides additional treatment allowing the washwater cruusher6.Crushed concrete stockpile and recycling plants, or largE4 construction sites, to be discharged to a surface water. The POTW should be 2 Stormwater Best Management Practice: Concrete Washout ,, Wet concrete recycling driver then washes down ' i T. p NW'Builders often order a little more ready mixed concrete than the chute into the bucket to kl" h. ' they actually need, so it is common for concrete trucks to remove any cementitious (- material before it hardens. * _ `•� have wet concrete remaining in their drum after a delivery. This — I unused concrete can be returned to the ready mixed plant and After washing out the chute, e. t either (1) used to pour precast concrete products (e.g., highway the driver pumps (yellow barriers, retaining wall blocks, riprap), (2) used to pave the arrow points to the pump) 4 ready mixed plant's yard, (3)washed into a reclaimer, or the washwater, sand, and --p -. ° °°„}° other fine solids from the Figure 8.Chute washout bucket and (4) dumped on an impervious surface and allowed to harden, pump so it can be crushed and recycled as aggregate. Unused wet bucket up into the truck's concrete should not be dumped on bare ground to harden at drum to be returned to the construction sites because this can contribute to ground water ready mixed plant,where it can be washed into a reclaimer. and surface water contamination. A removable screen at the bottom of the washout bucket prevents course aggregate from entering the pump. This Washout Containers course aggregate can also be returned to the plant and added to the coarse aggregate pile to be reused. All the materials are Different types of washout containers are available for recycled. collecting, retaining, and recycling the washwater and solids from washing down mixed truck chutes and pump truck Hay bale and plastic washout pit hoppers at construction sites. A washout pit made with hay bales and a plastic lining is shown in Figure 9. Such pits can be dug into the ground or built above Chute washout box grade.The plastic lining should be free of tears or holes that A chute washout box is mounted on the back of the ready would allow the washwater to escape (Fig. 10).After the pit is mixed truck. If the truck has three chutes,the following used to wash down the chutes of multiple ready mixed trucks procedure is used to perform the washout from the top down: and the washwater has evaporated or has been vacuumed off, (1)after the pour is completed, the driver attaches the extension the remaining hardened solids can be broken up and removed chute to the washout box, (2)the driver then rotates the main from the pit.This process may damage the hay bales and chute over the extension chute (Fig. 7) and washes down the plastic lining. If damage occurs, the pit will need to be repaired hopper first then the main chute, (3) finally the driver washes and relined with new plastic.When the hardened solids are down the flop down chute and last the extension chute hanging removed, they may be bound up with the plastic lining and have on the box. All washwater and solids are captured in the box. to be sent to a landfill, rather than recycled. Recyclers usually After the wash down, accept only unmixed material. If the pit is going to be emptied 1 i■ , washwater and solids are and repaired more than a few times, the hay bales and plastic ii• t'4, . returned to the ready mixed will be generating additional solid waste. Ready mixed concrete plant for recycling. A filter 7 0 Figure 9.Hay bale and plastic „; basket near the top of the , °`"- washout pit I, washout box separates out j _ the coarse aggregates so they can be placed in a " ° '�"Q bin for reuse either at the 4 , ." construction site or back at ° Figure 7.Chute washout box the cement plant. Figure 10.Leaking washout pit that Chute washout bucket and pump w has not been well R sKour A maintained After delivering ready mixed concrete and scraping the last of `°_� the customer's concrete down the chute, the driver hangs a `washout bucket shown in Figure 8 (see red arrow) on the end of r` the truck's chute and secures the hose to insure no leaks. The 3 Stormwater Best Management Practice: Concrete Washout trucks can use hay bale washout pits, but concrete pump subsequent discharge to a surface water. Everything is recycledvid trucks have a low hanging hopper in the back that may prevent or treated sufficiently to be returned to a natural surface water. their being washed out into bale-lined pits. Figure 14.Pump truck using the ramp to wash out into a roll-off bin Vinyl washout container •,..4, ' ,.. The vinyl washout w k-•- '' �- container (Fig. 11) is ' �'= Stormwater Best Management Practice: Concrete Washout should not be placed within 50 feet of storm drains, open Reference ditches, or waterbodies. Appropriate gravel or rock should cover approaches to concrete washout facilities when they are NRMCA 2009. Environmental Management in the Ready located on undeveloped property. On large sites with extensive Mixed Concrete Industry, 2PEMRM, 1st edition. By Gary M. concrete work, washouts should be placed at multiple locations Mullins. Silver Springs, MD: National Ready Mixed Concrete for ease of use by ready mixed truck drivers. If the washout Association. facility is not within view from the pour location, signage will be needed to direct the truck drivers. Websites and Videos Construction Materials Recycling Association Operating and Inspecting Washout www.concreterecycling.org Facilities Concrete washout facilities should be inspected daily and after National Ready Mixed Concrete Association heavy rains to check for leaks, identify any plastic linings and www.nrmca.org sidewalls have been damaged by construction activities, and determine whether they have been filled to over 75 percent National Ready Mixed Concrete Research and Education capacity. When the washout container is filled to over Foundation 75 percent of its capacity, the washwater should be vacuumed www.rmc-foundation.org off or allowed to evaporate to avoid overflows. Then when the Additional information and videos on concrete washout remaining cementitious solids have hardened, they should be containers and systems can be found by a web search for removed and recycled. Damages to the container should be "concrete washout." repaired promptly. Before heavy rains, the washout container's liquid level should be lowered or the container should be covered to avoid an overflow during the rain storm. Photograph Credits Figures 1,2.Mark Jenkins, Concrete Washout Systems, Inc. Educating Concrete Subcontractors Figure 3.Mark Shaw, Ultra Tech International, Inc. Figure 4.Mark Jenkins, Concrete Washout Systems, Inc. The construction site superintendent should make ready mixed Figure 5.Christopher Crouch, CCI Consulting truck drivers aware of washout facility locations and be watchful Figure 6. William Turley, Construction Materials Recycling Association for improper dumping of cementitious material. In addition, Figure 7.Brad Burke,Innovative Concrete Solutions, LLC concrete washout requirements should be included in contracts Figure 8.Ron Lankester, Enviroguard with concrete delivery companies. Figures 9, 10.Mark Jenkins, Concrete Washout Systems, Inc. Figures 11, 12. Tom Card, RTC Supply Figures 13, 14, 15.Mark Jenkins, Concrete Washout Systems, Inc. Figures 16, 17.Rick Abney Sr., Waste Crete Systems, LLP d,„,,, Disclaimer Please note that EPA has provided external links because they provide additional information that may be useful or interesting.EPA cannot attest to the accuracy of non-EPA information provided by these third-party websites and does not endorse any non-government organizations or their products or services. 5 Stantec Memo To: Mr. Max Greene From: Scott C. Blossom P.E. Rivanna Village Phase 1 Williamsburg, VA 23188 File: Rivanna Village WPO 201400077 Date: December 1, 2014 Dear Mr. Greene, This annotated comment response is provided as a component of the re-submittal of the Rivanna Village Erosion and Sediment Control Plans (Phase 1) previously provided. Reponses are listed in italics below. General Comment: This plan appears to be an Early Grading plan. Early grading can only occur after the Final Site Plan is approved. As previously discussed, an "interim"stormwater management plan, designed to treat cleared areas stabilized with turf, is now provided to allow for grading prior to site plan approval. The plan sets are organized as follows: 1.) Phase 1: Erosion and Sediment Control Plan a. Stage 1: Includes Construction Entrances, Perimeter Controls, Clearing Basin Rough Grading b. Stage 2: Site Grading, Trap and Basin Modifications, Temporary Stabilization 2.) Phase 1: "Interim"Stormwater Plan a. Stage 3: Includes Stormwater Management for Disturbed Areas prior to installation of impervious cover. I. Stormwater Pollution Prevention Plan (SWPPP) The SWPPP content requirements can be found in County Code section 17-405. A SWPPP must contain (1) a PPP, (2) an ESCP, (3) a SWMP, and (4) any TMDL measures necessary. 1. Notice of coverage letter is required for final VSMP approval. Acknowledged. Our understanding is that the VSMP Authority will submit upon deeming the application complete and approving the aforementioned plans. Please let us know if you need additional information. Design with community in mind bs\\us1265-101\shared_projects\203400205\02_correspondence\client\mem_annotated_response_20141 124.docx Stantec December 1, 2014 Mr.Max Greene Page 2 of 3 Reference: A. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17-404. 1. Appears to be adequately addressed at this time. Acknowledged. B. Stormwater Management Plan (SWMP) VSMP Regulations 9VAC25-870-108 requires the VSMP authority to approve or disapprove an ESCP. This plan is disapproved, and the reasons are provided in the comments below. The erosion control plan content requirements can be found in County Code section 17-402. 1. Type and line weight for elevation contours appear identical. Please use differing lines and/or weights such as a dashed line for the existing contours and a solid line for proposed. The line weights are now adjusted as requested for clarity. 2. Please provide profile views for the sediment basins and stormwater conveyance pipes. Profile views are now provided for all proposed sediment basins as requested, In addition, sizing calculations'and dimensions are provided. Please note that basin designs are developed further and detailed with the "Stage 3" interim stormwater plans. 3. Please show the Albemarle County Temporary Paved Construction Entrance detail on the plan. The detail can be found in the Albemarle County Design Standards Manual. The detail is now provided on Detail 7 Sheet 14. 4. There appear to be unprotected areas of cut/fill, but it's not clear due to proposed/existing contour lines and maybe extra lines on plan. The erosion and sediment control plan is designed to treat all disturbed areas. Select graded slopes that do not drain directly to a trap or basin will be stabilized with erosion control matting. In addition, select areas that have less than 100 feet of sheet flow contribution from disturbed areas are protected with perimeter controls only (i.e. silt.fence and/or super silt fence). Additional comments and/or conditions may be forthcoming due to requested changes to plan. Design with community in mind bs us 1265-f01\shared_projects\203400205\02_correspondence\client\mem_annotated_response_20141 124.docx co Stantec December 1,2014 Mr.Max Greene Page 3 of 3 Reference: Stantec Consulting Services Inc. Scott Blossom Senior Engineer Phone: (757) 220-6869 Fax: (757) 229-4507 scott.blossom @stantec.com Attachment: Site Plans, VRRM Spreadsheet c. ck, is Design with community in mind bs\\us1265401\shared_projects\203400205\02_correspondence\client\mem_annotated_response_20141124.docx