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HomeMy WebLinkAboutWPO201400069 Review Comments WPO VSMP 2015-06-22Short Review Comments Report for: WPO201400069 SubApplication Type: North Rivanna WTP Improvements Date Completed:09/05/2014 Reviewer:Max Greene CDD Engineering Review Status:Requested Changes Reviews Comments: Division: Date Completed:11/12/2014 Reviewer:Max Greene CDD Engineering Review Status:Requested Changes Reviews Comments: Division: Date Completed:12/12/2014 Reviewer:Max Greene CDD Engineering Review Status:Administrative Approval Reviews Comments: Division: Date Completed:05/29/2015 Reviewer:Max Greene CDD Engineering Review Status:No Objection Reviews Comments: Division: Date Completed:05/29/2015 Reviewer:Max Greene CDD Engineering Review Status:No Objection Reviews Comments: Division: Date Completed:06/22/2015 Reviewer:Ana Kilmer CDD Review Status:Approved Reviews Comments:6/4/2015- swa submitted to county 6/5/2015 - swa forwarded to CAO. CAO approved swas 6/5/2015 - swa forwarded to County Executive 6/22/2015 - swa recorded at Clerk's Office. Deed Book 4637, Page 528 Division: Page:1 of 1 County of Albemarle Printed On:October 17, 2017 � OF AL ,. vIRGI1`IZP COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902 -4596 Phone (434) 296 -5832 Fax (434) 972 -4126 VSMP Permit plan review Project title: North Rivanna WTP Improvements Project file number: WP0201400069 Plan preparer: Hazen and Sawyer [bedwards @hazenandsawyer.com] Owner or rep.: RIVANNA WATER & SEWER AUTHORITY Plan received date: 1 December 2014 Date of comments: 12 December 2014 Reviewers: Max Greene County Code section 17 -410 and Virginia Code §62.1- 44.15:34 require the VSMP authority to act on any VSMP permit by issuing a project approval or denial. This project is APPROVED. The VSMP application content requirements can be 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 ESOP, (3) a SWMP, and (4) any TMDL measures necessary. 1. Comments adequately addressed. B. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17 -404. 1. Comments adequately addressed. C. Stormwater Management Plan (SWMP) VSMP Regulation 9VAC25- 870 -108 requires the VSMP authority to approve or disapprove a SWMP. This plan is APPROVED. The stormwater management plan content requirements can be found in County Code section 17 -403. 1. Comments adequately addressed. D. Erosion and Sediment Control Plan (ESCP) Virginia Code §62.1- 44.15:55 require the VESCP authority to approve or disapprove an ESCP. This plan is APPROVED. The erosion control plan content requirements can be found in County Code section 17 -402. 1. Comments adequately addressed. Process; After approval, plans will need to be bonded. The bonding process is begun by submitting a bond estimate Engineering Review Comments Page 2 of 2 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=cden,gwpo Pile: PI_v smp_ rc vicw_PrgjcctNamc_%vI)o2Ol4000XX (4).doc Nome November 19, 2014 Mr. Max Greene County of Albemarle Department of Planning and Community Development 401 McIntire Road Charlottesville, VA 22902-4596 Re: Revised Erosion and Sediment Control Plan and Stormwater Management Plan North and South Rivanna WTPs W PO201400069, W PO201400073 Dear Mr. Greene: The Rivanna Water and Sewer Authority is proposing upgrades to the North Rivanna and the South Rivanna Water Treatment Plants (WTP). In response to review comments by the County of Albemarle, we hereby offer revised erosion and sediment control and stormwater management plans for both the North Rivanna WTP and South Rivanna WTP additions. Previous submittals to the County entered total parcel area in the "Site Data" tab of the Virginia Runoff Reduction Method (VA RRM)worksheet used to determine pollutant reduction required. Comments received from the County in a letter dated November 12, 2014 informed us, however, the area disturbed by construction activities is to be entered in this place on the worksheet. As the disturbed area is less than the parcel area for both sites, the required pollutant removal has been reduced at both the North Rivanna WTP and the South Rivanna WTP by 0.17 lb/yr and 1.07 Ib/yr, respectively(Table 1, below). As such, the stormwater requirements at each site have decreased, and a change in stormwater management has resulted. Because of the relatively small change in pollutant reduction required at North Rivanna, no changes to the proposed stormwater management BMP is proposed. As a result, North Rivanna has an excess 0.19 lb/yr nutrient removal credit, as calculated by the VA RRM worksheet. Communication with the County, as well as reference to the Code of Virginia (§ 62.1-44.19:18) have determined the excess credit is transferable between projects located within the same tributary, as the North and South Rivanna WTPs are. The excess pollutant removal credit thereby resulting from the North Rivanna WTP bioretention area, along with the decreased removal requirements at both sites, has allowed for the removal of one of the original two bioretention cells and the sand filter originally proposed for the South Rivanna WTP. The decrease in site area at the South Rivanna site means the removal 'w✓ requirement drops from 2.02 lb/yr of pollutant to 0.95 lb/yr of pollutant. As shown in Table 1, 0.08 lb/yr of the excess credit generated at North Rivanna WTP will be transferred to South Rivanna WTP to offset the remaining pollutant removal and obtain compliance for the site. Table 1: Pollutant Removal Requirements North Rivanna WTP South Rivanna WTP Previous Pollutant Removal 0.55 2.02 Resubmittal Required (Ib/yr) (10/02/2014) Pollutant Removal 0.57 2.06 Achieved (Ib/yr) Pollutant Removal 0.38 0.95 Current Required(lb/yr) Resubmittal Pollutant Removal 0.57 0.87 (11/19/2014) Achieved (Ib/yr) Excess Credit +0.19 -0.08 Please find attached two (2) copies of drawings illustrating the additional work to the North Rivanna WTP, two (2) copies of drawings illustrating the additional work to the South Rivanna WTP, two (2) copies of a descriptive Erosion and Sedimentation Control and Stormwater Management Plan for each site, two (2) copies of the Stormwater Pollution Prevention Plan for each site, and a Virginia Stormwater Management Program (VSMP) application for each site. Please do not hesitate to contact me should you require any additional information or have any questions. Sincerely, HAZEN AND SAWYER, P.C. Corinne E. Wilson, EIT Assistant Engineer Attachments sore November 19, 2014 W PO201400069 County of Albemarle Department of Community Development 401 McIntire Road Charlottesville, VA 22902-4596 Attn: Max Greene Re: North Rivanna WTP Improvements— W PO201400069 Response to comments Dear Mr. Greene: Please find below response to comments made for the North Rivanna Water Treatment Plant. Also attached in this submittal are updated drawings, updated stormwater and E&S calculations, and figures. In response to comments made by the Albemarle County Department of Community Development in a letter dated November 12, 2014, Hazen and Sawyer offers the following on behalf of the Rivanna Water and Sewer Authority. A. Stormwater Pollution Prevention Plan (SWPPP) Max Greene 1. Please have the owner fill out the required forms for the SWPPP for plan approval. The owner is the Operator until the plan is approved, the"Operator" can be transferred to additional personnel at any time during the duration of the project, see transfer forms in SWPPP.The link to the Albemarle County preferred SWPPP form is: http://www.albemarle.org/upload/images/forms_center/departments/Community_Development/forms/ Engineering_and WPO_Forms/Stormwater_Pollution_Prevention_Plan_SWPPP_template.doc Response: The owner has filled out the required forms for the SWPPP, and the forms have been included within the SWPPP included in this submittal. B. Pollution Prevention Plan (PPP) Max Greene 1. Appears adequately addressed at this time. Response: Comment noted. C. Stormwater Management Plan (SWMP) Max Greene 1. VRRM updated spread sheet appears to be for 5.2 acres of disturbance. The VRRM spreadsheet should be for the proposed new construction/disturbed area. The drainage area to the water quality structure appears to be @ 3/4 of an acre. Please Correct the VRRM Spreadsheet and show the drainage areas on the plan for conformation. Response: The VRRM spreadsheet has been adjusted to the area of disturbance rather than the parcel area. As a result,the stormwater results have been adjusted, as detailed in the narrative. D. Erosion and Sediment Control Plan (ESCP) Max Greene 1. The Variance for the Modified Mud Traps is approved for this project due to the confined space on site and proximity to the flood plain. Response: Comment noted. 2. Narrative/introduction is incorrect. a. It is impossible for the North Fork Rivanna Treatment plant to source water from the South Fork Rivanna River Reservoir. b. Adjacent areas are incorrect.This parcel does not have boundaries with the South Fork Rivanna Reservoir. c. The property does not slope towards the South Fork Rivanna Reservoir. d. Off-site stormwater issues are to protect the North Fork Rivanna River from sediment laden runoff. e. The permanent measures proposed will need to include the bio-retention basin. Response: The narrative has been updated to reflect the correct conditions of the North Rivanna Water Treatment Plant. Two(2)copies of the revised plans, calculations, narrative, and SWPPP have been provided, illustrating the responses above.We trust this information will allow you to complete your review for this application. Please do not hesitate to contact me with any questions or concerns. Sincerely, HAZEN AND SAWYER, P.C. ort-14/ p Corinne E. Wilson, EIT Assistant Engineer November 19, 2014 Mr. Max Greene County of Albemarle Department of Planning and Community Development 401 McIntire Road Charlottesville, VA 22902-4596 Re: Revised Erosion and Sediment Control Plan and Stormwater Management Plan North and South Rivanna WTPs W PO201400069,W PO201400073 Dear Mr. Greene: The Rivanna Water and Sewer Authority is proposing upgrades to the North Rivanna and the South Rivanna Water Treatment Plants (WTP). In response to review comments by the County of Albemarle, we hereby offer revised erosion and sediment control and stormwater management plans for both the North Rivanna WTP and South Rivanna WTP additions. Previous submittals to the County entered total parcel area in the"Site Data" tab of the Virginia Runoff Reduction Method (VA RRM)worksheet used to determine pollutant reduction required. Comments received from the County in a letter dated November 12, 2014 informed us, however, the area disturbed by construction activities is to be entered in this place on the worksheet. As the disturbed area is less than the parcel area for both sites, the required pollutant removal has been reduced at both the North Rivanna WTP and the South Rivanna WTP by 0.17 lb/yr and 1.07 Ib/yr, respectively(Table 1, below). As such,the stormwater requirements at each site have decreased, and a change in stormwater management has resulted. Because of the relatively small change in pollutant reduction required at North Rivanna, no changes to the proposed stormwater management BMP is proposed. As a result, North Rivanna has an excess 0.19 lb/yr nutrient removal credit, as calculated by the VA RRM worksheet. Communication with the County, as well as reference to the Code of Virginia (§ 62.1-44.19:18) have determined the excess credit is transferable between projects located within the same tributary, as the North and South Rivanna WTPs are. The excess pollutant removal credit thereby resulting from the North Rivanna WTP bioretention area, along with the decreased removal requirements at both sites, has allowed for the removal of one of the original two bioretention cells and the sand filter originally proposed for the South Rivanna WTP. The decrease in site area at the South Rivanna site means the removal requirement drops from 2.02 lb/yr of pollutant to 0.95 lb/yr of pollutant. As shown in Table 1, 0.08 lb/yr of the excess credit generated at North Rivanna WTP will be transferred to South Rivanna WTP to offset the remaining pollutant removal and obtain compliance for the site. Table 1:Pollutant Removal Requirements North Rivanna WTP South Rivanna WTP Previous Pollutant Removal 0.55 2.02 Resubmittal Required (Ib/yr) (10/02/2014) Pollutant Removal 0.57 2.06 Achieved(lb/yr) Pollutant Removal 0.38 0.95 Current Required(lb/yr) Resubmittal Pollutant Removal 0.57 0 87 (11/19/2014) Achieved (ib/yr) Excess Credit +0.19 -0.08 Please find attached two(2)copies of drawings illustrating the additional work to the North Rivanna WTP, two (2)copies of drawings illustrating the additional work to the South Rivanna WTP, two(2)copies of a descriptive Erosion and Sedimentation Control and Stormwater Management Plan for each site, two (2)copies of the Stormwater Pollution Prevention Plan for each site, and a Virginia Stormwater Management Program (VSMP)application for each site. Please do not hesitate to contact me should you require any additional information or have any questions. Sincerely, HAZEN AND SAWYER, P.C. Corinne E. Wilson, EIT Assistant Engineer Attachments November 19, 2014 WPO201400069 County of Albemarle Department of Community Development 401 McIntire Road Charlottesville,VA 22902-4596 Attn: Max Greene Re: North Rivanna WTP Improvements— W PO201400069 Response to comments Dear Mr. Greene: Please find below response to comments made for the North Rivanna Water Treatment Plant.Also attached in this submittal are updated drawings, updated stormwater and ESUS calculations, and figures. In response to comments made by the Albemarle County Department of Community Development in a letter dated November 12, 2014, Hazen and Sawyer offers the following on behalf of the Rivanna Water and Sewer Authority. A. Stormwater Pollution Prevention Plan(SWPPP) Max Greene 1. Please have the owner fill out the required forms for the SWPPP for plan approval.The owner is the Operator until the plan is approved, the"Operator"can be transferred to additional personnel at any time during the duration of the project, see transfer forms in SWPPP.The link to the Albemarle County preferred SWPPP form,is: http://www.albemarle.org/upload/images/forms center/departments/Community_Developmentlformsl Engineering and WPO_Forms/Stormwater_Pollution_Prevention_Plan_SWPPP template.doc Response: The owner has filled out the required forms for the SWPPP,and the forms have been included within the SWPPP included in this submittal. B.Pollution Prevention Plan(PPP) Max Greene 1. Appears adequately addressed at this time. Response:Comment noted. C.Stormwater Management Plan(SWMP) Max Greene 1. VRRM updated spread sheet appears to be for 5.2 acres of disturbance.The VRRM spreadsheet should be for the proposed new construction/disturbed area.The drainage area to the water quality structure appears to be @%of an acre. Please Correct the VRRM Spreadsheet and show the drainage areas on the plan for conformation. Niue *id Response:The VRRM spreadsheet has been adjusted to the area of disturbance rather than the parcel area. As a result,the stormwater results have been adjusted, as detailed in the narrative. D.Erosion and Sediment Control Plan (ESCP) Max Greene 1. The Variance for the Modified Mud Traps is approved for this project due to the confined space on site and proximity to the flood plain. Response: Comment noted. 2. Narrative/introduction is incorrect. a. It is impossible for the North Fork Rivanna Treatment plant to source water from the South Fork Rivanna River Reservoir. b. Adjacent areas are incorrect.This parcel does not have boundaries with the South Fork Rivanna Reservoir. c. The property does not slope towards the South Fork Rivanna Reservoir. d. Off-site stormwater issues are to protect the North Fork Rivanna River from sediment laden runoff. e. The permanent measures proposed will need to include the bio-retention basin. Response: The narrative has been updated to reflect the correct conditions of the North Rivanna Water Treatment Plant. Two(2)copies of the revised plans,calculations, narrative, and SWPPP have been provided, illustrating the responses above.We trust this information will allow you to complete your review for this application. Please do not hesitate to contact me with any questions or concerns. Sincerely, HAZEN AND SAWYER, P.C. G\-Cfrq 0`)C. Corinne E.Wilson, EIT Assistant Engineer � OF AL ,. vIRGI1`IZP COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902 -4596 Phone (434) 296 -5832 Fax (434) 972 -4126 VSMP Permit plan review Project title: North Rivanna Water Treatment Plant GAC Upgrades Project file number: WP0201400069 Plan preparer: Brett Edwards c/o Hazen & Sawyer [bedwards @hazenandsawyer.com] Owner or rep.: RIVANNA WATER & SEWER AUTHORITY Plan received date: 09 October 2014 Date of comments: 12 November 2014 Reviewers: Max Greene County Code section 17 -410 and Virginia Code §62.1- 44.15:34 requires the VSMP authority to act on any VSMP permit by issuing a project approval or denial. This project is denied. The rationale is given in the comments below. The application may be resubmitted for approval if all of the items below are satisfactorily addressed. The VSMP application content requirements can be 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 ESOP, (3) a SWMP, and (4) any TMDL measures necessary. Please have the owner fill out the required forms for the SWPPP for plan approval. The owner is the Operator until the plan is approved, the "Operator" can be transferred to additional personnel at anytime during the duration of the project, see transfer forms in SWPPP. The link to the Albemarle County preferred SWPPP form is: http:// www.albemarle.orL-/uDload/imaL-es /forms center /departments /Community Development/for ms/En ing eering_ and_ WPO_Forms /Stormwater_Pollution_ Prevention_ Plan B. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17 -404. 1. 1. Appears adequately addressed at this time. C. Stormwater Management Plan (SWMP) VSMP Regulation 9VAC25- 870 -108 requires the VSMP authority to approve or disapprove a SWMP. This plan is disapproved, and the reasons are provided in the comments below. The stormwater management plan content requirements can be found in County Code section 17 -403. 1. VRRM updated spread sheet appears to be for 5.2 acres of disturbance. The VRRM spreadsheet should be for the proposed new construction/ disturbed area. The drainage area to the water quality structure appears to be @ 3/4 of an acre. Please Correct the VRRM Spreadsheet and show the drainage areas on the plan for conformation. Engineering Review Comments Page 2 of 3 D. Erosion and Sediment Control Plan (ESCP) 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. The Variance for the Modified Mud Traps is approved for this project due to the confined space on site and proximity to the flood plain. 2. Narrative /introduction is incorrect. a. It is impossible for the North Fork Rivanna Treatment plant to source water from the South Fork Rivanna River Reservoir. b. Adjacent areas are incorrect. This parcel does not have boundaries with the South Fork Rivanna Reservoir. c. The property does not slope towards the South Fork Rivanna Reservoir. d. Off -site stormwater issues are to protect the North Fork Rivanna River from sediment laden runoff. e. The permanent measures proposed will need to include the bio- retention basin. 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. Engineering plan review staff are available from 2 -4 PM on Thursdays, should you require a meeting to discuss this review. Process; After approval, plans will need to be 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 Engineering Review Comments Page 3 of 3 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; ht!p://www.albemarle.or,-/deptforms.asp?department=cden,gwpo File: E1_vsmp_review_projectname.doc October 1, 2014 W PO201400069 County of Albemarle Department of Community Development 401 McIntire Road Charlottesville, VA 22902-4596 Attn: Max Greene Re: North Rivanna WTP Improvements— WPO201400069 Response to comments Dear Mr. Greene: Please find below response to comments made for the Crozet Water Treatment Plant. Also attached in this submittal are updated drawings, updated stormwater and E&S calculations, and figures. In response to comments made by Albemarle County, Hazen and Sawyer offers the following on behalf of the Rivanna Water and Sewer Authority. D.VSMP: SWPPP and Pollution Prevention Plan Max Greene 1. Permits and forms must be signed by legal representative. Response: This proiect has yet to AO out to bid. Once a contract has been awarded all necessary forms will be signed by the Contractor as the"Construction Activity Operator". E.VSMP: SWPPP: Stormwater Management Plan Max Greene 1. VRRM Worksheet is under review for State compliance. a. State instructions were"Do no change Annual Rainfall (inches)of 43" this VRRM has been altered to show 46 inches annual rainfall. Response: The VRRM spreadsheet has been updated to reflect the requirement of 43" of annual rainfall. b. Soils Hydrological groups do not appear correct. Response: As discussed on the telephone(September 11,2014),the Soil Hydrological group of B is correct for the North Rivanna WTP. 'oar' Nmil F. VSMP: SWPPP: Erosion and Sediment Control Plan Max Greene 1. Perimeter sediment trapping measures and diversion dikes must be out of the work area, and in places where they can be installed before grading activities commence. The plan does not appear to show adequate protection for the site work. SWM basin could be utilized for E&S protection. 4, Response: Modified mud traps have been added to the design as a perimeter sediment U trapping measure, as shown on C3301. A variance letter has also been included in this submittal along with the variance fee of$150. 2. The narrative does not appear to be for this project or the cut and paste was not edited properly prior to submittal. Please correct. Response: The narrative has been revised. 3. Please show the critical slopes on the plan per County designations. esponse: Albemarle County steep slopes have been shown on the revised Contract Drawings. Proposed disturbance within the preserved slopes region requires submittal of a steep slopes waiver,which has been included with this resubmittal. 4. Borrow and/or waste areas will require an approved VSMP plan or permits from receiving site. 03' Response: This language has been added to the erosion control notes on sheet C3301 as well as the erosion control sequence in the project's narrative. 5. Responsible land disturber certifications have been replaced with DEQ VSMP Operator Permit. Response: Specification section 02276 has been revised. 6. County code Chapter 17 has changed and the documents will need to reflect the changes. Response: County code references have been updated in the erosion control notes on sheet C3301,the erosion control narrative and specification section 02276. 7. Please show the phasing mentioned in Section 02276(E&SC control). Response: Sheet C3301 shows all phases of construction.We have located our E&S measures tfor protection for all construction for this project. The language in specification 02276 is standard language to inform the contractor that if a situations arises during construction that will affect the location of our proposed erosion control devices that he will have to adjust his measures accordingly and take the necessary procedures to revise the erosion control plan. 8. Please show the"Temporary Paved Construction entrance"detail from the Albemarle County Design Manual. Correct narratives as required. Response: The"Temporary Paved Construction entrance"detail has been added to detail sheet D3 and has been added to the Temporary Stabilization section of the narrative. 9. Check dams may be utilized to stabilize the ditch, but are not substitutes for perimeter sediment trapping devises. e� Response: Perimeter sediment trapping devices (modified mud traps) have been included, as '' shown on C3301. Two (2)copies of the revised plans, calculations, and narrative have been provided, illustrating the responses above. We trust this information will allow you to complete your review for this application. Please do not hesitate to contact me with any questions or concerns. Sincerely, HAZEN AND SAWYER, P.C. Bret T. Edwards, P.E. Principal Engineer Al f. �S COUNTY OF ALBEMARLE Department of Community Development 401 McIntire Road, Room 227 Charlottesville, Virginia 22902 -4596 Phone (434) 296 -5832 Fax (434) 972 -4126 Project: North Rivanna WTP Improvements WP0201400069 Plan preparer: Hazen and Sawyer [bedwards @hazenandsawyer.com] Owner or rep.: RIVANNA WATER & SEWER AUTHORITY Plan received date: 12 August 2014 Date of comments: 05 September 2014 Reviewer: reviewer The North Rivanna WTP Improvements Plans (WP0201400069) submitted 12 August 2014 have received Engineering Review and do not appear to meet Albemarle County minimum checklist items for approval. The Following items will need to be adequately addressed prior to final approval: A. Street plan (A separate road and drainage plan is required if the property is to be bonded for subdivision) 1. Not Applicable at this time. B. Site plan (A site plan is a record of zoning compliance on the property. It should not include VSMP plans) 1. Not applicable at this time. 2. C. Plat (A plat is a record of property division or reservation. Code Chapter 14) 1. Not Applicable at this time. D. VSMP: SWPPP and Pollution Prevention Plan (The Virginia stormwater management program, stormwater pollution prevention plan application and documents) 1. Permits and forms must be signed by legal representative. E. VSMP: SWPPP: Stormwater Management Plan 1. VRRM Worksheet is under review for State compliance. a. State instructions were "Do not change Annual Rainfall (inches) of 43" this VRRM has been altered to show 46 inches annual rainfall. b. Soils Hydrological groups do not appear correct. F. VSMP: SWPPP: Erosion and Sediment Control Plan 1. Perimeter sediment trapping measures and diversion dikes must be out of the work area, and in places where they can be installed before grading activities commence. The plan does not appear to show Engineering Review Comments Page 2 of 2 adequate protection for the site work. SWM basin could be utilized for E &SC protection. 2. The narrative does not appear to be for this project or the cut and paste was not edited properly prior to submittal. Please correct. 3. Please show the critical slopes on the plan per County designations. 4. Borrow and/or waste areas will require an approved VSMP plan or permits from receiving site. 5. Responsible land disturber certifications have been replaced with DEQ VSMP Operator Permit. Please have documents updated as required. 6. County Code Chapter 17 has changed and the documents will need to reflect the changes. 7. Please show the phasing mentioned in Section 02276 (E &SC control) 8. Please show the "Temporary Paved Construction entrance" detail from the Albemarle County Design Manual. Correct narratives as required. 9. Check dams may be utilized to stabilize the ditch, but are not substitutes for perimeter sediment trapping devices. G. Mitigation Plan (WPO2014000001) (A mitigation plan is a plan of buffer disturbances, and replanting or restorative measures) 1. Plan does not appear required at this time. Once these comments have been addressed, please submit 2 copies of the revised plans, calculations, and narratives to Current Development Engineering. Current Development Engineering is available from 2:30 -4 PM on Thursdays to discuss these review comments. Please contact Max Greene at 434 - 296 -5832 ext. 3283 or email mgreene(a),albemarle.org to schedule an appointment. File: E1_rpfspfptvsmp_MRG North Rivanna WTP Improvements.doc.docx