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Home My WebLink AboutWPO202100069 Correspondence 2022-07-08 (2)SHIMP ENGINEERING, P.C. Design Focused Engineering July 7, 2022 John Anderson County of Albemarle Department of Community Development 401 McIntire Road, North Wing Charlottesville, Virginia 22902 RE: Response Letter #2 for WPO2021-00069 Scottsville Tiger Fuel Market - VSMP Dear John, Thank you for your review of the VSMP request for Scottsville Tiger Fuel Market. This letter contains responses to County comments dated 5/20/22.Our responses are as follows: A. Stormwater Pollution Prevention Plan (SWPPP) 1 Please eftswe ccvnnn ,.a..,._ iftel .des _,.c _,.nee to sAIP02021 00069 RESPONSE: The WPO reference has been included. 2. Submit SWPPP using county template. a. See. 1 � Registfation Sla+effiew; please eaffiplefe. Feel fiee to eall if V31Y questions. ti See 6 A i DDD gxhiba Please ..6,.. initial Iaeation of i. Pain gauge. btA shall.... .Jo..�o....:.... 1 2 1.....Lh Re 1.uskets -Avoid diFe .t .L..:. age to A, stann e Gatiefete On sitof el if FequiFu.1 vii. (REV 1) Paint, stucco, chemical storage, if required. c. Sec. 6E: (REV 1) List named individual responsible for PPP measures. d. Sec. 8: (REV 1) Although county personnel will inspect, Applicant is required to retain qualified (contractor/third-party) E&S inspection personnel to perform ESC inspections and evaluate compliance relative to VESCH, 3rd Edition, 1992. e. See. 9i EnsuFe Signed CeFtifieatian is signed and dated. RESPONSE: A SWPPP with the required information above has now been provided. B. Pollution Prevention Plan (PPP) - (REV 1) see SWPPP item 2.b., above. The PPP content requirements can be found in County Code section 17-404. C. Stormwater Management Plan (SWMP) 1 BiaFetention that Fos@-ves 'FidnRg f+Rfn hatspat land uses Should not be treated with infiltFatin.g 912 E. High Sr. Charlottesville, VA 22902 1434.227.5140 1 shimp-engineering.com Bli�.,rgn spee;neatien-ror--Wtspe�,.,d-Use. RESPONSE: An impermeable liner and underdrain system are now shown for the bioretention basin. 2. Show and label biefetentieft Level 1 pfe tfeatffiew aft G6 pfafile. Ref. NIA DEQ Spee. 9, Table RESPONSE: The pretreatment area has been labeled as Level 1 on the profile. It e RESPONSE: Table 9.6 from the bioretention basin spec is now included on C 13. RESPONSE: Inspection guidelines for bioretention basins are now included on sheet C 13. https:Ai.,...>,..,.,... *feyp.pred e ,.loud.,vt va..i. p , eF4e..ti piRad-,.nn17i11 —AMP Spe„ Tile o nrnncTEINTION . 1 o 03012011 .W RESPONSE: The maintenance and inspection measures from the bioretention basin spec are now included on sheet C 13. htt..,..iiy^,y,,y.al,e., afle ,..,.n,,.me/st,,..,.. ubliisheddoewne«to 1944cz71274 10536700000 RESPONSE: This has been included on sheet C 13. T C3 ealleetion (San N944 b. Wherever storm runoff concentrates against curb, provide and label curb/gutter, CG-6. (REV 1) In some locations where grade concentrates storm runoff against curb, design appears to propose CG-2. Please replace CG-2 with CG-6 wherever proposed grade concentrates storm runoff against curb. RESPONSE: a. The carwash wastewater discharge line is now shown in plan and profile. b. CG labels are now shown. RESPONSE: A letter of availability has been included with this re -submittal. The nutrient credit has been updated so a new letter will be procured to reflect this change. 9. C6 912 E. High St.. Charlottesville, VA 22902 1434.227.51401 shlmp-engineenrig.rom E)Fifiee se. It. (REV 1) Recommend label L, DIA, % slope, etc. for blue -circle pipes /structure/s between bioretention and detention basin. RESPONSE: a. The emergency spillway is labeled in plan and shown in profile. b. A bioretention planting plan has been added per the bioretention basin spec. See planting list on sheet C13. c. All requested elevations are now provided. d. A riser foundation is now shown. Please reference the buoyancy calculations attached. The weight of concrete exceeds the buoyant force. e. Embankment details are now provided. A clay core and cutoff trench are shown for the pond and bioretention basin. f. Slope labels are now provided for both facilities. g. The design has been modified to allow for a 3" control orifice instead of 2.5". RESPONSE: Riprap dimensions are now labeled at the pond outfall. -r-r-rcvv-r RESPONSE: A trash rack and anti -vortex plate are now detailed for the standpipe with corresponding VDOT standard reference. 17 n1 � RON4 0 plan ttlo tR iRpl de Fee, tR V'120 021 nnnLO RESPONSE: The WPO # has been added to the plan. II Calc. packet ., Revise title nano_ a 12,17Q 1) t,. ...hide FeF t,. mnrnr» 100069 c-fcvciirio-��ic-rcora—-r��o-rcn--w-nrvnva.z-oovvr b. Pg. 36 of packet /VaRRM.xls indicates 0.12 Ac. forest /open space post -developed land cover. Provide deeded easement for 0.12 Ac. (FOS easement), else revise VaRRM.xls post -developed land cover table to reflect 0.0 Ac. forest /open space. Adjust SWM approach, as needed, to meet water quality compliance requirements at 9VAC25-870-65. RESPONSE: a. The WPO # is now shown on the calc packet title page. b. The VRRM has been revised to show 0 ac of forest/open space. This did not impact the post development flow rate. 14. Provide SWM fa, to easement plat application. Link to application: hMs://www.albemarle.org/home/showpublisheddocument/1052/637624089314100000 RESPONSE: A SWM facility/access easement will be provided and submitted in a new plat. 15. Provide and label SWM facility access. See requirements at ACDSM, p. 12, Best Management P..,.;..._, ° Stormwater Management. Provide mountable curb and other minimum features required for ,s to detention pond dam. RESPONSE: Facility access easements have been added. 16. Notc: Easement plat must be recorded prior to WPO plan approval. RESPONSE: Acknowledged, the plat will be recorded prior to approval. 17. Note: SWM facilities are located on TMP 130A1-00-00-047B0; owner of TMP 130A1-00-00-047BO is a required party to SWM Facility Maintenance Agreement, and WPO plan bond. RESPONSE: Acknowledged, these parcels share the same property owner. The SWM Facility 912 E. High St. Charlottesville, VA 22902 1434.227,5140 1 shimp-engineering.com Maintenance Agreement will be submitted once the easement plat is recorded. D. Erosion and Sediment Control Plan (ESOP) 1. PFON'ide labels that distinguish whieh is Sediment trap!, whieh is ST-2, eensistent with C-, I I S", tah I Ps - RESPONSE: Sediment trap labels are now shown that match the detail on C12. 2. ST-I adjaeent to Valley StFeet, R420� Please Mffea5e tFap size se that ST failuFe is less likely, and any design ...:..:.,.am tl.on an failwe will be haFd to Forned. it- I..te. RESPONSE: Agreed, the sediment trap has been oversized to handle a 25% increase in capacity. RESPONSE: The construction entrance detail has been updated accordingly. n r-v C-91 D.,...ide silt F nee 1.�FSWR dike and R4 24 RESPONSE: Silt fence is now shown between the diversion dike and Rt. 20. 5. C& b. Indicate stockpile location, if any. RESPONSE: a. ST floor dimensions are now shown. b. Stockpiles are not anticipated for this site. c. The silt fence has been removed and the diversion dike extended to capture this area in sediment trap #2. The high point in the existing grade will be excavated to facilitate drainage until curb and drainage structures are installed. d. ST drainage areas are now shown on the phase 1 E&SC plan sheet. 6. Provide interim ESC plan and sequence that anticipate ESC measures required to transition ST2 to a detention pond while maintaining adequate ESC that prevents off -site sediment release. Ph ESC plan shows a perimeter sediment trap. Ph2 ESC shows biofilter, and a detention pond that occupies sediment trap (ST2) location without any indication how site runoff will be controlled as site transitions from Phl to Ph2. During transition, site runoff must be controlled with adequate ESC measures at south edge of site. a. (REV 1) C11, Sequence Note 6_ May include typo—' No road proposed with this development. b. (REV 1) C11, Note 7: Please revise ref- to C9 to ref. RESPONSE: a. This has been corrected to reference pavement. b. Sheet C 11 is now referenced. .. until road construction is complete... sheet C11,instead. RESPONSE: A note has been added that the upslope area must be stabilized prior to bioretention basin construction. 912 E. High St. Charlottesville, VA 22902 1434.227,5140 1 shimp-engineering.com 8. Provide SAF along Rt. 20 and Kt. 726. (REV 1) Please provide safety fence (SAF) along Rt. 20 and Rt 726. RESPONSE: SAF is now specified along Rt 20 and Rt 726. RESPONSE: No offsite disposal is anticipated. Should that change, the registration statement and permit will be updated. If you have any questions or concerns about these revisions, please feel free to contact me at chris@shimp-en ing eering com or by phone at 434-227-5140. Regards, Chris Marshall, EIT Staff Engineer Shimp Engineering, P.C. 912 E. High St.. Charlottesville, VA 22902 1434.227.51401 shlmp-engineenrig.rom