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HomeMy WebLinkAboutWPO201300029 Review Comments 2016-06-20Short Review Comments Report for: WPO201300029 SubApplication Type: ALBRECHT PLACE Stormwater Management/BMP Plan Erosion and Sediment Control Plan Date Completed:02/04/2016 Reviewer:Max Greene CDD Engineering Review Status:Administrative Approval Reviews Comments: Division: Date Completed:06/04/2013 Reviewer:Michael Koslow CDD Engineering Review Status:Requested Changes Reviews Comments: Division: Date Completed:06/04/2013 Reviewer:Michael Koslow CDD Engineering Review Status:Requested Changes Reviews Comments: Division: Date Completed:01/06/2014 Reviewer:Michael Koslow CDD Engineering Review Status:Requested Changes Reviews Comments: Division: Date Completed:03/25/2014 Reviewer:Max Greene CDD Engineering Review Status:Requested Changes Reviews Comments: Division: Date Completed:03/25/2014 Reviewer:Max Greene CDD Engineering Review Status:No Objection Reviews Comments: Division: Date Completed:06/01/2015 Reviewer:Max Greene CDD Engineering Review Status:See Recommendations Reviews Comments:Recordation of the new drainage easement is required for final approval of the VSMP and Site Plans. Division: Date Completed:04/28/2016 Reviewer:Max Greene CDD Engineering Review Status:No Objection Reviews Comments: Division: Date Completed:06/20/2016 Reviewer:Ana Kilmer Review Status:Approved Reviews Comments:6/7/2016 - swa submitted 6/10/2016 - swa approved by CAO 6/13/2016 - swa signed by CE 6/20/2016 - swa recorded at clerks office. deed book 4774, page 21 Division: Page:1 of 2 County of Albemarle Printed On:November 19, 2017 6/13/2016 - swa signed by CE 6/20/2016 - swa recorded at clerks office. deed book 4774, page 21 Page:2 of 2 County of Albemarle Printed On:November 19, 2017 �pF A vt�r�1Q 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: Albrecht Place Project file number: WP0201300029 Plan preparer: Terra Concepts, P.C. [mkeller @terraconceptspc.com] Owner or rep.: ANVINCE LAND TRUST; SUE A ALBRECHT & LARRY J MCELWAIN CO- TRUSTEES Plan received date: 12 May 2015 Date of comments: 1 June 2015 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 ESCP, (3) a SWMP, and (4) any TMDL measures necessary. 1. Approved as submitted. B. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17 -404. 1. PPP Needs to be submitted for review. 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. Can be approved upon receipt of recordation of drainage easement across adjacent parcel 61M -124C. 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. Can be approved upon receipt of recordation of drainage easement across adjacent parcel 61M- 12 -1C. Engineering Review Comments Page 2 of 2 The VSMP permit application and all plans may be approved upon the recordation of the stormwater drainage easement plat. 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 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/deptfonns.asp?department--cdengMTo File: E1_vsmp review projectname.doc i" ,. `IRGINZP 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: Plan preparer: Owner or rep.: Plan received date: (Rev]) (Rev2) Date of comments: (Rev]) (Rev2) Reviewer: Albrecht Place (Early Grading) Terra Concepts, P.C. Anvince Land Trust 14 March 2013 (Rev]) 22 November 2013 (Rev2) 20 February 2014 4 June 2013 (Revl)6 January 2014 (Rev2) 25 March 2014 Nfiehael Kes .., Max Greene (WP02013- 00029) [tel 434 -531 -3600] The Third erosion and sediment control plan and stormwater management plan (WPO201300029) submitted 20 February 2014 has received Engineering Review and does not appear to meet Albemarle County minimum checklist items for approval. Please adequately address the remaining comments for final approval: A. Application Information 1) After plan approval but prior to grading permit issuance, a stormwater management maintenance agreement will be required. (Rev]) Comment has been acknowledged. (Rev2) Stormwater maintenance agreement process has "not" begun as of the time of this review. B. Existing Conditions Information 1) Please visually confirm the topographic survey conditions shown on sheet 2 and note as such on the plans. Topography over one year old must be field verified by designer. (Rev]) Comment remains. Note on sheet 2 states the survey conditions were visually verified in 2013. C. Plan View Information 1) Please number all existing and proposed drainage structures and pipes proposed for this project including 15" HDPE pipe proposed to cross under sidewalk at SE corner of property. (Rev]) Comment remains. Appears to apply to Post - Development Drainage Area Map detail on sheet 6 for Stormwater Management. 2) Please provide with for proposed easements for two pipes proposed at SE corner of property. A 20' drainage easement is required for conveyance of drainage off -site. The pipe must be within the center third of the easement. (Rev]) Comment remains. Appears to apply to Post - Development Drainage Area Map detail on sheet 6 for Stormwater Management. Engineering Review Comments Page 2 of 4 D. Erosion and Sediment Control Plan (Rev]) Note: Erosion and Sediment Control (ESC) Plan review was not requested on 11/19/2013. All ESC Comments remain for next submittal (typical for comments DI -D17). 1) Please include within plan or narrative the proposed limits of disturbance area for this project. (REV2) All proposed disturbances have not been included within the proposed limits of disturbance. 2) Please remove references to the early grading plan (WPO2013- 00019, aka the clearing and grubbing plan) from the narrative and plan per withdrawal of the application. Suggest a phased ESC plan based on how work appears to be proposed in this plan set (i.e. erosion control protection for multiple phases of proposed construction). (REV2) Comment has been addressed. 3) Please provide an adequate channel analysis for runoff from proposed construction. Analysis could be proven given: a) adherence to VESCH MS -19 requirements (see 4VAC50- 30 -40, MS -19 sec. b (1)): The applicant shall demonstrate that total drainage area to the point of analysis within the channel is one hundred times greater than the contributing drainage areas of the project in question. A report or plan depiction with analysis to this point could prove channel adequacy. Point of analysis could be just west of US -29. b) adherence to VA code 10.1- 603.4(7): essentially, the required condition for an on -site solution without looking downstream for a 24 hour 1.5, 2, and 10 -year intensity event - (post - development) Peak flow rate <= Pf *VfNp Where Pf = peak flow rate in a forested condition Vf = runoff volume in a forested condition Vp = runoff volume proposed Please note this analysis is necessary for all phases of proposed construction, including the phase proposed on sheet 3. Recommend re- routing runoff from phase proposed on sheet 3 to drain to the west channel to simplify the adequate channel analysis. (REV2) Channel analysis is from outlet of site downstream to 1% of drainage area or agreeable alternative. An analysis to the culvert boxes under State Route 29 will be sufficient for this project. 4) Albemarle County requires paved construction entrances to be shown on development plans [Albemarle County Engineering Review Reference Details Page 3 of 6] to mitigate erosion. Please include this detail with the plans. It appears this detail could substitute for "Stone Construction Entrance" shown on sheet 5. (REV2) Comment has been addressed. Engineering Review Comments Page 3 of 4 5) Please include dust control for this project on sheet 3. (REV2) Comment has been addressed. 6) Please include temporary seeding for this project on sheets 3 and 4 (REV2) Comment has been addressed. 7) Please label apparent soil type boundaries on sheet 3. (REV2) Comment has been addressed. 8) Please label existing drainage divides on sheet 3. (REV2) Comment has been addressed. 9) Please provide calculations for sediment basin propoosed on sheet 4 (for prior to its conversion to a bioretention basin). (REV2) Comment has been addressed. 10) Please indicate safety fencing around proposed sediment basin proposed on sheet 4. (REV2) Comment has been addressed. 11) It appears that sediment laden runoff from the east side of the project would flow out of the site across the construction entrance as shown on sheet 3. Please introduce a R/W diversion to ensure this runoff flows to the sediment trap. (REV2) Comment has been addressed. 12) It appears that existing topography creates a low point at the SW corner of the property as shown on sheet 3. Please indicate proposed grading or a note that the proposed diversion dike shall be graded to ensure that sediment laden runoff flows to the sediment trap. (REV2) Comment has been addressed. 13) Please indicate proposed staging and contractor parking areas or comment if these are included within the limits of disturbance proposed. (REV2) Comment has been addressed. 14) Please extend limits of disturbance to include grading proposed to tie in critical slope area at the southeast corner of the site. (REV2) Comment has been addressed. 15) Please include silt fence to protect proposed grading to tie in critical slope area at the southeast corner of the site. (REV2) Comment has been addressed. 16) Please include culvert inlet protection and outlet protection for proposed 15" CMP. (REV2) Comment has been addressed. 17) Please extend limits of disturbance to include inlet protection proposed at the east side of the property. (REV2) See first comment in this section. E. Stormwater Management Plan Engineering Review Comments Page 4 of 4 1) Please include Albemarle County General Construction Notes for Stormwater Management Plans as indicated in the Design Standards Manual. (Rev]) Comment has been addressed. 2) Please confirm total area and locations (could use a legend item with apparent symbol on sheet 6) for proposed paver block locations. (Rev]) Comment has been addressed. 3) Trash racks are required for primary spillways for bio- filters. Please remove section of note 3 on "Bio- Filter Section & Outlet w/Internal Water Storage "As an alternative to the trash rack, an overflow structure may be a drop inlet with a bar grate, or stone weir discharge to stable channel or storm drain." (Rev]) Comment has been addressed. 4) The following elevations on proposed `Bio- Filter Riser Struct. P3" and "Bio- Filter Section & Outlet w/ Internal Water Storage" sections on sheet 7 which appear to be off by 100': 564.00, 563.90 (four elevation corrections total). Please update or advise. (Rev]) Comment remains. (REV2) Comment has been addressed. F. Stormwater Management Computations 5) Two and ten year storm detention calculations appear to begin showing storage at bioretention floor elevation of 465.50. Please update detention calculations for "Hydrograph for Pond 2P: Bio - Basin Page 9" and "Hydrograph for Pond 2P: Bio- Basin" Page 8 for 2 and 10 year storms respectively. Detention volumes should begin at elevation 466.50 for bioretention basin proposed. Note: Albemarle County encourages the use of Internal Water Storage (IWS) with bioretention basins. However, high clay content soils are common in the area. County engineering would require soil borings to indicate percolation capacity for subgrade soils, in order to count this volume with detention calculations. It does not appear that the IWS was considered in detention calculations included with this submittal. (Revl) Stormwater management detention and water quality volume computations were not included with this submittal. Please provide these calculations. (REV2) Comment has been addressed. Current Development Engineering is available from 2:30 -4 PM on Thursdays to discuss these review comments. Please contact Michael Koslow at 434 - 296 -5832 ext. 3297 or email mkoslow @albemarle.org to schedule an appointment. [17- 204.f1 An application for an erosion and sediment control plan that requires modifications, terms, or conditions to be included in order for it to be approved shall be deemed to be withdrawn if the owner fails to submit a revised plan addressing the omitted modifications, terms or conditions within six (6) months after the owner is informed of the omitted information as provided under paragraph (B). ry '1 sue TERRA CONCEPTS PC 2046 ROCK QUARRY ROAD LOUISA,VIRGINIA 23093 10 February 2014 Mr. Glenn Brooks Albemarle County 401 McIntire Road Charlottesville, Virginia 22902 RE: WP02013-00029 Albrecht Place; Re-Submission of WPO Plan Dear Mr. Brooks: We have received review comments relative to the above mentioned application from Michael Koslow. We have addressed the comments provided relative to the final site development plan submission and below have stated how and where on the plans each matter has been addressed. Should you find our responses in order, we are asking that you contact Ellie Ray when they are ready to issue your tentative final approval of the plans. We hope you find our re-submission worthy of your approval. Sinc: ely I —owvl'I 4 VP ar . -II- , L • xc: Sue Albrecht, Woody Parrish, Alan Franklin attachments: plan sets, letters, related documentation ACTION PER COMMENT: A. Application Information 1. Comment previously addressed. B. Existing Conditions Information 1. The site has been subsequently revisited to confirm topographic conditions and the note has been amended on Sheet 2. C. Plan View Information 1. Labels been added. 2. Easements are now shown. D. Erosion and Sediment Control Plan 1. The limits of disturbance are shown and labeled on Sheet 3. 2. The sheet referred to as the"early grading plan" is still being included because it represents what we have determined to be what is necessary to accomplish the first phase of the work.Therefore vire ba -retitled it Stage One E&S Plan. There have been adjustments made to it based upon your comments and the restriction placed upon diverting the runoff into the existing Shopper's World system. The majority of the outfall is now directed west to the channel. 3. The Stage One E&S concept has changed such that runoff will be collected and treated on the west side of the site and shall outfall to the large manmade channel. Analysis of the large channel has t been Completed and results are provided on Sheet 8. 4. The CE detail has beer? pdated. 5. DC has been added to the program on Sheets 3 and 4. 6. Temporary seeding has been added to Sheet 3, while permanent seeding and sod are proposed on Sheet 4. 7. They are shown. 8. They are now shown. 9. These calculations are now provided on Sheet 3 for both Sediment Traps. 10. Safety fence has been added. 11. Runoff is no longer being directed that way. Two separate sediment traps are now proposed. 12. The plan has changed, therefore this comment no longer applies. 13. The contractor staging and parking will occur within the future limits of the large parking lot and is shown and labeled on Sheet 3. 14. This has been done. 15. This has been done. 16. This has been done. 17. This has been done. E. Stormwater Management Plan 1. Comment previously addressed. 2. Comment previously addressed. 3. Comment previously addressed. 4. Elevation correction made. F. Stormwater Management Computations 5. Per phone conversation this issue has been resolved without plan and calculation revision. ` 1%'1% ih tieom 1/1101. vinGicnP 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: Albrecht Place(Early Grading) (WP02013-00029) Plan preparer: Terra Concepts,P.C. [tel 434-531-3600] Owner or rep.: Anvince Land Trust Plan received date: 14 March 2013 (Revl) (Revl)22 November 2013 Date of comments: 4 June 2013 (Revl) (Revl)6 January 2014 Reviewer: Michael Koslow The second erosion and stormwater management plan (WP0201300029) submitted 19 November 2013 has received Engineering Review and does not appear to meet Albemarle County minimum checklist items for approval. Please adequately address the following comments for final approval: A. Application Information 1) After plan approval but prior to grading permit issuance,a stormwater management maintenance agreement will be required. (Rev])Comment has been acknowledged. B. Existing Conditions Information 1) Please visually confirm the topographic survey conditions shown on sheet 2 and note as 0K.,../-"such on the plans. Topography over one year old must be field verified by designer. (Revl)Comment remains. Note on sheet 2 states the survey conditions were visually verified in 2013. C. Plan View Information 1) Please number all existing and proposed drainage structures and pipes proposed for this project U it" including 15"HDPE pipe proposed to cross under sidewalk at SE corner of property. / (Revl)Comment remains. Appears to apply to Post-Development Drainage Area Map detail on sheet 6 for Stormwater Management. 2) Please provide with for proposed easements for two pipes proposed at SE corner of property. A 20' drainage easement is required for conveyance of drainage off-site. The pipe must be within the center third of the easement. D (Rev])Comment remains. Appears to apply to Post-Development Drainage Area Map detail on sheet 6 for Stormwater Management. Engineering Review Comments Page 2 of 4 D. Erosion and Sediment Control Plan (Revl)Note:Erosion and Sediment Control(ESC)Plan review was not requested on 11/19/2013. All ESC Comments remain for next submittal(typical for comments DI-D17). • 1) Please include within plan or narrative the proposed limits of disturbance area for this project. MQ5 ,p" cLvd.a. All p opo42m -Cva (' ,waL /3uas tvt — 2) Please remove references to the early grading plan(WPO2013-00019, aka the clearing and grubbing plan)from the narrative and plan per withdrawal of the application. Suggest a phased ESC plan based on how work appears to be proposed in this plan set(i.e.erosion control 6�� protection for multiple phases of proposed construction). 3) Please provide an adequate channel analysis for runoff from proposed construction. Analysis could be proven given: a) adherence to VESCH MS-19 requirements(see 4VAC50-30-40,MS-19 sec.b(1)):The applicant shall demonstrate that total drainage area to the point of analysis within the channel is one hundred times greater than the contributing drainage areas of the project in question. A report or plan depiction with analysis to this point could prove channel adequacy. Point of 6 analysis could be just west of US-29. b) adherence to VA code 10.1-603.4(7): essentially,the required condition for an on-site solution without looking downstream for a 24 hour 1.5,2,and 10-year intensity event- (post-development)Peak flow rate<=Pf*Vf/Vp Where Pf=peak flow rate in a forested condition Vf=runoff volume in a forested condition Vp=runoff volume proposed Please note this analysis is necessary for all phases of proposed construction,including the phase proposed on sheet 3. Recommend re-routing runoff from phase proposed on sheet 3 to drain to the west channel to simplify the adequate channel analysis. ✓4) Albemarle County requires paved construction entrances to be shown on development l9 K- plans[Albemarle County Engineering Review Reference Details Page 3 of 6]to mitigate erosion. Please include this detail with the plans. It appears this detail could substitute for "Stone Construction Entrance"shown on sheet 5. ✓5) Please include dust control for this project on sheet 3. ✓ 6) Please include temporary seeding for this project on sheets 3 and 4. 7) Please label apparent soil type boundaries on sheet 3. • 8) Please label existing drainage divides on sheet 3. t/9) Please provide calculations for sediment basin propoosed on sheet 4(for prior to its conversion to a bioretention basin). v10)Please indicate safety fencing around proposed sediment basin proposed on sheet 4. r '1•01•0 slid Engineering Review Comments Page 3 of 4 11) It appears that sediment laden runoff from the east side of the project would flow out of the site f� I across the construction entrance as shown on sheet 3. Please introduce a RJW diversion to ensure this runoff flows to the sediment trap. 12)It appears that existing topography creates a low point at the SW corner of the property as shown 'v l A on sheet 3. Please indicate proposed grading or a note that the proposed diversion dike shall be graded to ensure that sediment laden runoff flows to the sediment trap. V13)Please indicate proposed staging and contractor parking areas or comment if these are included within the limits of disturbance proposed. r14) Please extend limits of disturbance to include grading proposed to tie in critical slope area at the southeast corner of the site. 15) Please include silt fence to protect proposed grading to tie in critical slope area at the southeast corner of the site. 16 Please include culvert inlet protection and outlet protection for proposed 15"CMP. 17)Please extend limits of disturbance to include inlet protection proposed at the east side of the property. E. Stormwater Management Plan l.) Please include Albemarle County General Construction Notes for Stormwater Management Plaits as indicated in t}1e Design Standards Manual, (Rev/)Comment has been addressed. 2i Please confirm.total area and locations (could use a le,eeud item with apparent symbol on sheet 6) for proposed paver block locations, (Rev])Comment has been addressed. 3i Trash racks are required for primal),spillways for bio-niters. Please remove section of note 3 on ''Hio-i it€. ,r Section & Outlet w/internal Water Storage "As an alternative to the trash rack,an overflow, ructu.re may be a drop inlet with a bar;grate, or stone weir discharge to stable channel or storm drain." (Rev.]) Comment has been addressed. 4) The following elevations on proposed"Bio-Filter Riser Struct.P3"and"Bio-Filter Section& yOutlet w/Internal Water Storage"sections on sheet 7 which appear to be off by 100': 564.00, 563.90(four elevation corrections total). Please update or advise. (Rev])Comment remains. Engineering Review Comments Page 4 of 4 F. Stormwater Management Computations 5) Two and ten year storm detention calculations appear to begin showing storage at bioretention floor elevation of 465.50. Please update detention calculations for"Hydrograph for Pond 2P:Bio- Basin Page 9"and"Hydrograph for Pond 2P:Bio-Basin"Page 8 for 2 and 10 year storms respectively. Detention volumes should begin at elevation 466.50 for bioretention basin proposed. Note:Albemarle County encourages the use of Internal Water Storage(IWS)with bioretention basins. However,high clay content soils are common in the area. County engineering would require soil borings to indicate percolation capacity for subgrade soils,in order to count this volume with detention calculations. It does not appear that the IWS was considered in detention calculations included with this submittal. (Rev])Stormwater management detention and water quality volume computations were not included with this submittal. Please provide these calculations. Current Development Engineering is available from 2:30-4 PM on Thursdays to discuss these review comments. Please contact Michael Koslow at 434-296-5832 ext. 3297 or email mkoslow@albemarle.org to schedule an appointment. [17-204.f] An application for an erosion and sediment control plan that requires modifications,terms,or conditions to be included in order for it to be approved shall be deemed to be withdrawn if the owner fails to submit a revised plan addressing the omitted modifications,terms or conditions within six(6)months after the owner is informed of the omitted information as provided under paragraph(B). i" ,. `IRGINZP 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: Albrecht Place (Early Grading) (WP02013- 00029) Plan preparer: Terra Concepts, P.C. [tel 434 -531 -3600] Owner or rep.: Anvince Land Trust Plan received date: 14 March 2013 (Rev]) (Rev]) 22 November 2013 Date of comments: 4 June 2013 (Rev]) (Revl)6 January 2014 Reviewer: Michael Koslow The second erosion and sedifneat eentfel plan and stormwater management plan (WPO201300029) submitted 19 November 2013 has received Engineering Review and does not appear to meet Albemarle County minimum checklist items for approval. Please adequately address the following comments for final approval: A. Application Information 1) After plan approval but prior to grading permit issuance, a stormwater management maintenance agreement will be required. (Rev]) Comment has been acknowledged. B. Existing Conditions Information 1) Please visually confirm the topographic survey conditions shown on sheet 2 and note as such on the plans. Topography over one year old must be field verified by designer. (Rev]) Comment remains. Note on sheet 2 states the survey conditions were visually verified in 2013. C. Plan View Information 1) Please number all existing and proposed drainage structures and pipes proposed for this project including 15" HDPE pipe proposed to cross under sidewalk at SE corner of property. (Rev]) Comment remains. Appears to apply to Post - Development Drainage Area Map detail on sheet 6 for Stormwater Management. 2) Please provide with for proposed easements for two pipes proposed at SE corner of property. A 20' drainage easement is required for conveyance of drainage off -site. The pipe must be within the center third of the easement. (Rev]) Comment remains. Appears to apply to Post - Development Drainage Area Map detail on sheet 6 for Stormwater Management. Engineering Review Comments Page 2 of 4 D. Erosion and Sediment Control Plan (Rev]) Note: Erosion and Sediment Control (ESC) Plan review was not requested on 11/19/2013. All ESC Comments remain for next submittal (typical for comments D1 -D17). 1) Please include within plan or narrative the proposed limits of disturbance area for this project. 2) Please remove references to the early grading plan (WPO2013- 00019, aka the clearing and grubbing plan) from the narrative and plan per withdrawal of the application. Suggest a phased ESC plan based on how work appears to be proposed in this plan set (i.e. erosion control protection for multiple phases of proposed construction). 3) Please provide an adequate channel analysis for runoff from proposed construction. Analysis could be proven given: a) adherence to VESCH MS -19 requirements (see 4VAC50- 30 -40, MS -19 sec. b (1)): The applicant shall demonstrate that total drainage area to the point of analysis within the channel is one hundred times greater than the contributing drainage areas of the project in question. A report or plan depiction with analysis to this point could prove channel adequacy. Point of analysis could be just west of US -29. b) adherence to VA code 10.1- 603.4(7): essentially, the required condition for an on -site solution without looking downstream for a 24 hour 1.5, 2, and 10 -year intensity event - (post - development) Peak flow rate <= Pf *VfNp Where Pf = peak flow rate in a forested condition Vf = runoff volume in a forested condition Vp = runoff volume proposed Please note this analysis is necessary for all phases of proposed construction, including the phase proposed on sheet 3. Recommend re- routing runoff from phase proposed on sheet 3 to drain to the west channel to simplify the adequate channel analysis. 4) Albemarle County requires paved construction entrances to be shown on development plans [Albemarle County Engineering Review Reference Details Page 3 of 6] to mitigate erosion. Please include this detail with the plans. It appears this detail could substitute for "Stone Construction Entrance" shown on sheet 5. 5) Please include dust control for this project on sheet 3. 6) Please include temporary seeding for this project on sheets 3 and 4 7) Please label apparent soil type boundaries on sheet 3. 8) Please label existing drainage divides on sheet 3. 9) Please provide calculations for sediment basin propoosed on sheet 4 (for prior to its conversion to a bioretention basin). 10) Please indicate safety fencing around proposed sediment basin proposed on sheet 4. Engineering Review Comments Page 3 of 4 11) It appears that sediment laden runoff from the east side of the project would flow out of the site across the construction entrance as shown on sheet 3. Please introduce a R/W diversion to ensure this runoff flows to the sediment trap. 12) It appears that existing topography creates a low point at the SW corner of the property as shown on sheet 3. Please indicate proposed grading or a note that the proposed diversion dike shall be graded to ensure that sediment laden runoff flows to the sediment trap. 13) Please indicate proposed staging and contractor parking areas or comment if these are included within the limits of disturbance proposed. 14) Please extend limits of disturbance to include grading proposed to tie in critical slope area at the southeast corner of the site. 15) Please include silt fence to protect proposed grading to tie in critical slope area at the southeast corner of the site. 16) Please include culvert inlet protection and outlet protection for proposed 15" CMP. 17) Please extend limits of disturbance to include inlet protection proposed at the east side of the property. E. Stormwater Management Plan 1) Please include Albemarle County General Construction Notes for Stormwater Management Plans as indicated in the Design Standards Manual. (Revl) Comment has been addressed. 2) Please confirm total area and locations (could use a legend item with apparent symbol on sheet 6) for proposed paver block locations. (Rev]) Comment has been addressed. 3) Trash racks are required for primary spillways for bio- filters. Please remove section of note 3 on "Bio- Filter Section & Outlet w /Internal Water Storage "As an alternative to the trash rack, an overflow structure may be a drop inlet with a bar grate, or stone weir discharge to stable channel or storm drain." (Rev]) Comment has been addressed. 4) The following elevations on proposed `Bio- Filter Riser Struct. P3" and `Bio- Filter Section & Outlet w/ Internal Water Storage" sections on sheet 7 which appear to be off by 100': 564.00, 563.90 (four elevation corrections total). Please update or advise. (Rev]) Comment remains. Engineering Review Comments Page 4 of 4 F. Stormwater Management Computations 5) Two and ten year storm detention calculations appear to begin showing storage at bioretention floor elevation of 465.50. Please update detention calculations for "Hydrograph for Pond 2P: Bio- Basin Page 9" and "Hydrograph for Pond 2P: Bio- Basin" Page 8 for 2 and 10 year storms respectively. Detention volumes should begin at elevation 466.50 for bioretention basin proposed. Note: Albemarle County encourages the use of Internal Water Storage (IWS) with bioretention basins. However, high clay content soils are common in the area. County engineering would require soil borings to indicate percolation capacity for subgrade soils, in order to count this volume with detention calculations. It does not appear that the IWS was considered in detention calculations included with this submittal. (Rev]) Stormwater management detention and water quality volume computations were not included with this submittal. Please provide these calculations. Current Development Engineering is available from 2:30 -4 PM on Thursdays to discuss these review comments. Please contact Michael Koslow at 434 - 296 -5832 ext. 3297 or email mkoslow @albemarle.ora to schedule an appointment. [17- 204.f] An application for an erosion and sediment control plan that requires modifications, terms, or conditions to be included in order for it to be approved shall be deemed to be withdrawn if the owner fails to submit a revised plan addressing the omitted modifications, terms or conditions within six (6) months after the owner is informed of the omitted information as provided under paragraph (B). TERRA CONCEPTS, PC 2046 ROCK QUARRY ROAD LOUISA,VIRGINIA 23093 15 November 2013 Mr. Michael Koslow Albemarle County 401 McIntire Road Charlottesville, Virginia 22902 RE: WPO2013-00029 Albrecht Place; Re-Submission of Final Site Development Plan Dear Mr. Koslow: Thank you for your review comments relative to the above mentioned application.We have addressed the comments you provided relative to the final site development plan submission and below have stated how and where on the plans each matter has been addressed. Some comments required some rethinking of the approach, so please see if we have reengineered the WPO measures appropriately. Should you find our responses in order, we are asking that you contact Ellie Ray when they are ready to issue your tentative final approval of the plans. We hope you find our re-submission worthy of your approval. Sincer: y, • ti.-- 401 Mark . Kel er, LL xc: Sue Albrecht, Woody Parrish, Alan Franklin attachments: plan sets, letters, related documentation ACTION PER COMMENT: A.Application Information 1. Noted. B. Existing Conditions Information 1. A note has been added to Sheet 2. C. Plan View Information 1. Labels been added. 2. Easements are now shown. D. Erosion and Sediment Control Plan 1. This has been done. 2. The sheet referred to as the"early grading plan" is still being included because it represents what we have determined to be what is necessary to accomplish the first phase of the work.Therefore we have retitled it Stage One E&S Plan. There have been adjustments made to it based upon your comments and the restriction placed upon diverting the runoff into the existing Shopper's World system.The majority of the outfall is now directed west to the channel. 3. The Stage One E&S concept has changed such that runoff will be collected and treated on the west side of the site and shall outfall to the large manmade channel. Analysis of the large channel has been completed and results are provided on Sheet 8. 4. The CE detail has bepdated. Nod 5. DC has been added to the program on Sheets 3 and 4. 6. Temporary seeding has been added to Sheet 3, while permanent seeding and sod are proposed on Sheet 4. 7. They are shown. 8. They are now shown. 9. These calculations are now provided. 10. Safety fence has been added. 11. Runoff is no longer being directed that way. 12. The plan has changed, therefore this comment no longer applies. 13. The contractor staging and parking will occur within the future limits of the large parking lot. 14. This has been done. 15. This has been done. 16. This has been done. 17. This has been done. E. Stormwater Management Plan Please review the entire submittal to see if these 5 comments have been addressed. Re- engineering should have addressed them entirely. F. Stormwater Management Computations 5. Per phone conversation this issue has been resolved without plan and calculation revision. pp A 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: Albrecht Place(Early Grading) (WP02013-00029) Plan preparer: Terra Concepts,P.C. [tel 434-531-3600] Owner or rep.: Anvince Land Trust Plan received date: 14 March 2013 Date of comments: 4 June 2013 Reviewer: Michael Koslow The first erosion and sediment control plan and stormwater management plan (WP0201300029) submitted 16 April 2013 has received Engineering Review and does not appear to meet Albemarle County minimum checklist items for approval. Please adequately address the following comments for final approval: A. Application Information 1) After plan approval but prior to grading permit issuance,a stormwater management maintenance agreement will be required. B. Existing Conditions Information 1) Please visually confirm the topographic survey conditions shown on sheet 2 and note as such on the plans. Topography over one year old must be field verified by designer. C. Plan View Information 1) Please number all existing and proposed drainage structures and pipes proposed for this project including 15"HDPE pipe proposed to cross under sidewalk at SE corner of property. 2) Please provide with for proposed easements for two pipes proposed at SE corner of property. A 20' drainage easement is required for conveyance of drainage off-site. The pipe must be within the center third of the easement. D. Erosion and Sediment Control Plan 1) Please include within plan or narrative the proposed limits of disturbance area for this project. 2) Please remove references to the early grading plan(WPO2013-00019,aka the clearing and grubbing plan)from the narrative and plan per withdrawal of the application. Suggest a phased ESC plan based on how work appears to be proposed in this plan set(i.e. erosion control protection for multiple phases of proposed construction). 14osoe 84.1 Engineering Review Comments Page 3 of 3 14)Please extend limits of disturbance to include grading proposed to tie in critical slope area at the southeast corner of the site. 15) Please include silt fence to protect proposed grading to tie in critical slope area at the southeast corner of the site. 16) Please include culvert inlet protection and outlet protection for proposed 15"CMP. 17) Please extend limits of disturbance to include inlet protection proposed at the east side of the property. E. Stormwater Management Plan 1) Please include Albemarle County General Construction Notes for Stormwater Management Plans as indicated in the Design Standards Manual. 2) Please confirm total area and locations(could use a legend item with apparent symbol on sheet 6) for proposed paver block locations. 3) Trash racks are required for primary spillways for bio-filters. Please remove section of note 3 on "Bio-Filter Section&Outlet w/Internal Water Storage"As an alternative to the trash rack,an overflow structure may be a drop inlet with a bar grate,or stone weir discharge to stable channel or storm drain." 4) The following elevations on proposed"Bio-Filter Riser Struct. P3"and"Bio-Filter Section& Outlet w/Internal Water Storage"sections on sheet 7 which appear to be off by 100': 564.00, 563.90(four elevation corrections total). Please update or advise. F. Stormwater Management Computations 5) Two and ten year storm detention calculations appear to begin showing storage at bioretention floor elevation of 465.50. Please update detention calculations for"Hydrograph for Pond 2P:Bio- Basin Page 9"and"Hydrograph for Pond 2P: Bio-Basin"Page 8 for 2 and 10 year storms respectively. Detention volumes should begin at elevation 466.50 for bioretention basin proposed. Note:Albemarle County encourages the use of Internal Water Storage(IWS)with bioretention basins. However,high clay content soils are common in the area. County engineering would require soil borings to indicate percolation capacity for subgrade soils, in order to count this volume with detention calculations. It does not appear that the IWS was considered in detention calculations included with this submittal. Current Development Engineering is available from 2:30-4 PM on Thursdays to discuss these review comments. Please contact Michael Koslow at 434-296-5832 ext. 3297 or email mkoslowna,albemarle.org to schedule an appointment. [17-204.f] An application for an erosion and sediment control plan that requires modifications,terms,or conditions to be included in order for it to be approved shall be deemed to be withdrawn if the owner fails to submit a revised plan addressing the omitted modifications,terms or conditions within six(6)months after the owner is informed of the omitted information as provided under paragraph(B). �� OF A i" A 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: Albrecht Place (Early Grading) (WP02013- 00029) Plan preparer: Terra Concepts, P.C. [tel 434 -531 -3600] Owner or rep.: Anvince Land Trust Plan received date: 14 March 2013 Date of comments: 4 June 2013 Reviewer: Michael Koslow The first erosion and sediment control plan and stormwater management plan (WPO201300029) submitted 16 April 2013 has received Engineering Review and does not appear to meet Albemarle County minimum checklist items for approval. Please adequately address the following comments for final approval: A. Application Information 1) After plan approval but prior to grading permit issuance, a stormwater management maintenance agreement will be required. B. Existing Conditions Information 1) Please visually confirm the topographic survey conditions shown on sheet 2 and note as such on the plans. Topography over one year old must be field verified by designer. C. Plan View Information 1) Please number all existing and proposed drainage structures and pipes proposed for this project including 15" HDPE pipe proposed to cross under sidewalk at SE corner of property. 2) Please provide with for proposed easements for two pipes proposed at SE corner of property. A 20' drainage easement is required for conveyance of drainage off -site. The pipe must be within the center third of the easement. D. Erosion and Sediment Control Plan 1) Please include within plan or narrative the proposed limits of disturbance area for this project. 2) Please remove references to the early grading plan (WP02013- 00019, aka the clearing and grubbing plan) from the narrative and plan per withdrawal of the application. Suggest a phased ESC plan based on how work appears to be proposed in this plan set (i.e. erosion control protection for multiple phases of proposed construction). Engineering Review Comments Page 2 of 3 3) Please provide an adequate channel analysis for runoff from proposed construction. Analysis could be proven given: a) adherence to VESCH MS -19 requirements (see 4VAC50- 30 -40, MS -19 sec. b (1)): The applicant shall demonstrate that total drainage area to the point of analysis within the channel is one hundred times greater than the contributing drainage areas of the project in question. A report or plan depiction with analysis to this point could prove channel adequacy. Point of analysis could be just west of US -29. b) adherence to VA code 10.1- 603.4(7): essentially, the required condition for an on -site solution without looking downstream for a 24 hour 1. 5, 2, and 10 -year intensity event - (post - development) Peak flow rate <= Pf*VfNp Where Pf = peak flow rate in a forested condition Vf = runoff volume in a forested condition Vp = runoff volume proposed Please note this analysis is necessary for all phases of proposed construction, including the phase proposed on sheet 3. Recommend re- routing runoff from phase proposed on sheet 3 to drain to the west channel to simplify the adequate channel analysis. 4) Albemarle County requires paved construction entrances to be shown on development plans [Albemarle County Engineering Review Reference Details Page 3 of 6] to mitigate erosion. Please include this detail with the plans. It appears this detail could substitute for "Stone Construction Entrance" shown on sheet 5. 5) Please include dust control for this project on sheet 3. 6) Please include temporary seeding for this project on sheets 3 and 4 7) Please label apparent soil type boundaries on sheet 3. 8) Please label existing drainage divides on sheet 3. 9) Please provide calculations for sediment basin propoosed on sheet 4 (for prior to its conversion to a bioretention basin). 10) Please indicate safety fencing around proposed sediment basin proposed on sheet 4. 11) It appears that sediment laden runoff from the east side of the project would flow out of the site across the construction entrance as shown on sheet 3. Please introduce a R/W diversion to ensure this runoff flows to the sediment trap. 12) It appears that existing topography creates a low point at the SW corner of the property as shown on sheet 3. Please indicate proposed grading or a note that the proposed diversion dike shall be graded to ensure that sediment laden runoff flows to the sediment trap. 13) Please indicate proposed staging and contractor parking areas or comment if these are included within the limits of disturbance proposed. Engineering Review Comments Page 3 of 3 14) Please extend limits of disturbance to include grading proposed to tie in critical slope area at the southeast corner of the site. 15) Please include silt fence to protect proposed grading to tie in critical slope area at the southeast corner of the site. 16) Please include culvert inlet protection and outlet protection for proposed 15" CMP. 17) Please extend limits of disturbance to include inlet protection proposed at the east side of the property. E. Stormwater Management Plan 1) Please include Albemarle County General Construction Notes for Stormwater Management Plans as indicated in the Design Standards Manual. 2) Please confirm total area and locations (could use a legend item with apparent symbol on sheet 6) for proposed paver block locations. 3) Trash racks are required for primary spillways for bio- filters. Please remove section of note 3 on "Bio- Filter Section & Outlet w/Intemal Water Storage "As an alternative to the trash rack, an overflow structure may be a drop inlet with a bar grate, or stone weir discharge to stable channel or storm drain." 4) The following elevations on proposed `Bio- Filter Riser Struct. P3" and `Bio- Filter Section & Outlet w/ Internal Water Storage" sections on sheet 7 which appear to be off by 100': 564.00, 563.90 (four elevation corrections total). Please update or advise. F. Stormwater Management Computations 5) Two and ten year storm detention calculations appear to begin showing storage at bioretention floor elevation of 465.50. Please update detention calculations for "Hydrograph for Pond 2P: Bio - Basin Page 9" and "Hydrograph for Pond 2P: Bio- Basin" Page 8 for 2 and 10 year storms respectively. Detention volumes should begin at elevation 466.50 for bioretention basin proposed. Note: Albemarle County encourages the use of Internal Water Storage (IWS) with bioretention basins. However, high clay content soils are common in the area. County engineering would require soil borings to indicate percolation capacity for subgrade soils, in order to count this volume with detention calculations. It does not appear that the IWS was considered in detention calculations included with this submittal. Current Development Engineering is available from 2:30 -4 PM on Thursdays to discuss these review comments. Please contact Michael Koslow at 434 - 296 -5832 ext. 3297 or email mkoslow@albemarle.org to schedule an appointment. [17- 204.f1 An application for an erosion and sediment control plan that requires modifications, terms, or conditions to be included in order for it to be approved shall be deemed to be withdrawn if the owner fails to submit a revised plan addressing the omitted modifications, terms or conditions within six (6) months after the owner is informed of the omitted information as provided under paragraph (B).