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HomeMy WebLinkAboutWPO202100046 Review Comments WPO VSMP 2023-03-08�.i OF AL8 11�r County of Albemarle m COMMUNITY DEVELOPMENT DEPARTMENT VSMP Permit Plan Review Project title: Barnes Lumber Project file number: WP0202100046 Plan preparer: Clint Shifflett [clint.shifflett@timmons.com] Owner or rep.: Frank Stoner [fstoner@milestonepartners.co] Plan received date: Aug. 12, 2021 Aug. 19, 2022 Feb. 7, 2023 Date of comments: Sept. 13, 2021 Oct. 4, 2022 (Rev. 1) March 8, 2023 (Rev. 2) Reviewer: David James [djames2@albemarle.org] 401 McIntire Road, North Wing Charlottesville, VA 22902-4579 Telephone: 434- 29 6- 5 832 WWW.ALBEMARLE.ORG 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/approved. The rationale is given in the comments below. The VSMP application content requirements can be found in County Code section 17-401. Note: An approved initial site plan or preliminary plat may be required prior to WPO plan approval. Let me know if one has been approved yet. 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. Please complete the Registration Statement. (Rev.1/2) Not addressed. Acknowledged, please complete prior to approval. 2. ter when obtained. (Rev.1/2) Acknowledged, please 3. complete prior to pre -con request. 3terway an (Rev.1) Addressed. 4. Section 9 - Sign &date Signed Certification. (Rev.1/2) Not addressed. Acknowledged, please complete prior to approval. 5. (Rev.1/2) Acknowledged, please complete prior to pre -con request. 6. Note: Engineering will append the approved plan to end of SWPPP. B. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17-404. 1. Update with revision changes. (Rev.1/2) Acknowledged. 2. (Rev.2) Provide a concrete washout detail. 3. (Rev.2) Show staging area, rainfall gauge location, paving & landscaping operations. 4. (Rev.2) Include all PP items within the limits of disturbance. C. Stormwater Management Plan (SWMP) Engineering Review Comments Page 2 of 7 VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is denied, 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. Provide pre -/post- land cover map showing percentage of each land cover. (Rev.1) Addressed. 2. Address potential drainage issue: (Rev.1) Addressed. 3. There are a few long ditches created please identity & provide ditch design (table). a. Show drainage area, slope/profile, cross-section showing geometry, 2410-yr levels, liner type needed/provided. (Rev.1) Addressed. 4. Sheet 7(1) - Longer flow paths that should be considered that begin at the upper elevation of drainage area. a. The drainage areas, CN values, etc. need to match those shown in the calcs, vice - versa. (Rev.1) Addressed. 5. Sheet 7(3) - a. Provide slope, length & type information of barrel. b. Provide trash rack and detail over bottom orifice. (Rev.1) Addressed. 6. Design Calculations - a. Verify NOAA 24-hr precipitation values are correct. b. Provide post -development map of these areas. Do these areas match up with what's shown on Sheet 7(2)? (Rev.1) Addressed. 7. Provide inlet shaping (IS-1) in any drainage inlet structure with 4' or greater drop. (Rev.1) Addressed. 8. Provide safety slab (SL-1) in any drainage structure taller than 12'. (Rev.1) Addressed. 9. Sheet 8(1) - Provide end wall (EW-1) for 48" dia. pipe. (Rev.1) Addressed. 10. Show the HGL in the storm profiles. (Rev.1) Addressed. See comment #15. 11. Retaining wall must be located outside of SWM facility easement. (Rev.1) Acknowledged; N/A. 12. Provide forebays/gabion weir for detention pond. (Rev.1) Acknowledged; N/A. 13. There appears to be disturbance in the 100' stream buffer that will need to be mitigated. (Rev.1) Acknowledged. 14. Please provide approval/acceptance by VDOT if this pond is to be maintained by VDOT and not with the County. (Rev.1) Acknowledged; N/A. 15. (Rev.1) Sheet 8(1) - a. Add a note or callout(s) to provide water -tight fittings at pipe joint connections where the HGL is above the pipes (i.e. under pressure). b. Add note or callout(s) to provide water -tight fittings where pipes of dissimilar Engineering Review Comments Page 3 of 7 materiz iec (Rev.2) Addressed. 16. (Rev.2) Provide the culvert design for structure 400 to 402 (VDOT LD-269 or similar) and show the drainage area. 17. (Rev.2) Please include county's SWM As -built checklist on the plans. https://www.albemarle.org/home/showpublisheddocument/3381/638055636496430 000 18. (Rev.2) Sheet 7(3) - Please correct outfall 2 (Energy Balance). OOTFALL2 CHANNEL PROTECTION(ENERGY BALANCE)-1 YR Ql YRPRE-OEr • RPl YR➢RB-DHr Q�rxrosr-DsvrorAL IF - RV +Q1YR-uRulsruxncu IYF➢OST-06r 9.30 CFS 5 0.80 • ( 8.30 • 0.681) / 1.113 + 6.9� 9.30 CFS 5 1099 CFS OK 6.59cfs (talcs] FLOOD PROTECTION- 10 YR Q10 YR POST-M TOTAL 5 Q10YR➢R6-DW 39.98 CFS s 35.19CFS + 18.3 39.98 CFS 1 43.54 CFS 17.52cfs [talcs] OR 19. (Rev.2) Sheet 8(3) - Revise: There are a few table entries with '???'. 20. (Rev.2) Easement plat will need to be submitted and approved prior to WPO plan approval. 21. (Rev.2) Deed of dedication will need to be recorded with the easement plat prior to WPO plan approval. 22. (Rev.2) SWM agreement will need to be approved prior to WPO plan approval. 23. (Rev.2) Consider dedicating on -site forest & open space in an easement to reduce offsite nutrient credit purchase. [DEQ GM 22-2012] 24. (Rev.2) Nutrient credit agreement & purchase of credits will need to be completed prior to grading permit issuance. 3.19 Ib/yr reported 25. (Rev.2) Offsite credits may be purchased at the same or adjacent HUC 02080204. D. Mitigation Plan (MP) The mitigation plan requirements can be found in County Code Chapter 17-406. 1. Submit plan for review. (Rev.1) Addressed. 2. (Rev.1) The mitigation area is 100' from the edge of stream (50' shown), see County GIS. (Rev.2) Addressed. 3. (Rev.2) Outline or shade the buffer disturbance with acreages labeled. Engineering Review Comments Page 4 of 7 4. (Rev.2) Double-check the amount of buffer disturbance. I got around 30,OOOsf. L 5. (Rev.2) Provide the buffer planting plan numbers and native species. Refer to the County's native plant database. https://www.albemarle.org/government/facilities- environmental -services/environmenta I-services/native-plants E. 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. Please add the WPO# to title sheet. (Rev.1) Addressed. 2. Sheets 2 through can be removed. Keep •� ;ewes. (Rev.1) Acknowledged. (Rev.2) Not addressed. Please remove sheet & from the title sheet index. -road related 3. xisting Conditions Sheets - Show the 100' stream buffer accurately. (Rev.1) Not addressed. It's 100' from stream edge. Refer to County GIS. (Rev.2) Addressed. 4. E&SC Sheets - a. Please include all demo activities in your limits of disturbance. (Rev.1) Acknowledged. b. Provide CRS (VADEQ E&SC Spec. No. 3.03) or DC (VADEQ E&SC Spec. No. 3.39) for the roads. (Rev.1) Acknowledged. c. Show OP symbol at barrel end outfall. (Rev.1) Acknowledged. d. Provide CIP & OP here: SCALE 1 -W (Rev.1) Acknowledged. e. Add TP or adjust LOD line: i. Identify area (landscaping?) Engineering Review Comments Page 5 of 7 (Rev.1) Acknowledged. f. Add a baffle for phase II Sediment Basin to prevent short-circuiting. (Rev.1) Acknowledged. 5. Determine if anti -vortex is needed for SIB and if so provide detail. (Rev.1) Acknowledged. 6. Please correct the amount disturbed in your LOD. 18.10 ac & 18.64 ac are shown on the nlans. (Rev-1) Acknowledged. 7. (Rev.2) E&SC Sheets - a. Show a stockpile location. Provide silt fence around pile and TS &/or cover. b. Show TS/PS symbols for the grading. c. Show MU symbols for grading 3:1. Engineering Review Comments Page 6 of 7 d. Show B/M symbols for grading over 3:1 where mulch wouldn't be appropriate. (namely the SB) e. Add fence or barrier at the ends of road. f. Ph.11 - A ST is recommended near structure 502B. IP is inadequate alone at structure 504 given the 5+ ac DA. An alternative would be to provide check dams along channels A & B and diverting some of the DA to structure 502B. Same for structure 210; Add check dams along channels D & E. g. Ph.11 -Show SF all along the west end of project. h. Ph.11 - Include offsite grading and utility connection in your LOD (west end). 8. (Rev.2) Provide earthwork estimate of cut & fill (cy). 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, erosion and sediment control and stormwater management improvements must be bonded. The bonding process begins when the plan is approved, and the applicant submits a bond estimate request form and fee to the Department of Community Development. A plan reviewer 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 to the County, who will record the agreement. After bonding and agreements are complete, county staff enters project information in a DEQ database for state application processing, if a DEQ permit is required. DEQ reviews 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, which must be posted at the construction site. After DEQ coverage is issued, via the coverage letter, the County can hold a pre -construction conference. Applicants must complete the request for a pre -construction conference form and Engineering Review Comments Page 7 of 7 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; https://www.albemarle.org/govern ment/community-development/apply-for/engineeri ng-applications