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HomeMy WebLinkAboutWPO201900043 Correspondence 2019-11-1304F TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. November 12, 2019 Emily Cox County of Albemarle Dept. of Community Dev. 401 McIntire Rd. Charlottesville, VA 22902 608 Preston Avenue P 434.295.5624 Suite 200 F 434.295.8317 Charlottesville, VA 22903 www.timmons.com RE: AutoZone Charlottesville Store #6464 — VSMP Permit Plan Review — WP0201900043 - Comment Response Letter Dear Ms. Cox: We have reviewed all of your comments from August 29, 2019 and made the necessary revisions. Please find our responses to the comments below in bold lettering. 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. Registration statement must be filled out and signed. Acknowledged. The signed registration statement will be provided prior to final site plan approval. 2. Section 9 (signed certification) must be signed. Acknowledged. Executed signed certification page will be provided prior to final site plan approval. B. Pollution Prevention Plan (PPP) The PPP content requirements can be found in County Code section 17-404. 1. No comments. 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. Nutrient credits must be purchased before plan can be approved. Please contact Ana Kilmer before purchasing the credits. CIVIL ENGINEERING I ENVIRONMENTAL I SURVEYING I GIs I LANDSCAPE ARCHITECTURE I CONSTRUCTION SERVICES Acknowledged. Nutrient credit availability letter has been added to the calculation book. Purchasing of nutrient credits will be coordinated with Ana Kilmer. 2. SWM Maintenance agreement must be recorded before plan can be approved Nutrient credits must be purchased before plan can be approved. Please contact Ana Kilmer to start this process. Acknowledged. 3. A plat and deed showing the SWM facility easement must be recorded before the plan can be approved. Acknowledged. 4. Clearly show the extent of the SWM Facility easement. Stormwater Easement Plan has been added. See Sheet C2.3. 5. Provide a detail of the SWM facility. Will there be a trash rack? What size are the manholes/openings? Are they accessible for maintenance? Are there any special installation instructions? Site specific detail of SWM A to be provided once received. 6. Provide maintenance requirements for the SWM facility on the plans. Detention Pipe Maintenance schedule has been added to Sheet C1.6. 7. Provide the following checklist on the plans:. Checklist added to cover C0.0. 8. Please double check all calculations. Page 7 of the calculations does not match Sheet C1.6 (1.03 vs 1.06 etc). Due to the removal of the proposed entrance from Route 29, areas have been updated and double checked. 9. Please double check the DA for inlet 118. Drainage Areas have been updated per the plan changes. 10. Are the storm pipes sized for the future development? It is clear the SWM facility was sized/routed for it, but the storm calculations do not appear to include the future area (the DA for 112 is 069 c factor for future building area). The pipe calculations for future development are not being performed at this time. They will need to be computed at the time of the future development design. The SWM facility has been sized for a conservative potential option so that the pipe will not need to be replaced. The details of how the inlet and pipe calculations would change with the future development are too specific to assume. 11. 0.5% is the minimum storm pipe slope. The calculation shows some pipe slopes less than 0.5%. Pipes corrected to have a minimum slope of 0.5%. 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. A soils type map was not apparent on the plans or in the calculation's booklet. All soil on site is type 91. A callout has been added to Sheet C1.4. 2. Please show a wash rack at the construction entrance. A callout and the detail have been added. See Sheet C1.3. 3. Please show mulching anywhere there is TS or PS. Mulching has been added to sheets C1.4 and U.S. 4. Per PGIII-72 pf the VESCH, please show there is a 2:1 length: width flow ratio for the sediment trap flow path. The sediment trap was reshaped, and a wood baffle was added to ensure a 2:1 flow ratio. See Sheet 1.4. We have included PDF copies of the plans and calculations for your review. If you have any questions or comments, please feel free to give me a call at 434.295.5624. Sincerely, Craig Kotarski, P.E. Principal