HomeMy WebLinkAboutWPO202000055 Correspondence 2021-07-01I® COLLINS ENGINEERING (200 GARRETT ST, SUITE K CHARLOTTESVILLE VA 22902
( 434.293.3719 PH 434.293.2813 FX
( www.collins-engineering.com
May 18, 2021
Emily Cox
Department of Community Development
401 McIntire Road
Charlottesville, VA 22902
RE: White Gables Major VSMP Amendment WP0202000055)
Thank you for your comments dated April 29, 2021 on the above referenced project. Below are our responses to the
remaining comments on the road plans.
A. Stormwater Pollution Prevention Plan (SWPPP)
1. Comment addressed.
2. Signed registration statement and signed certification is provided.
B. Pollution Prevention Plan (PPP)
1. Comment addressed.
C. Stormwater Management Plan (SWMP)
1. SWM maintenance agreement has been started.
2. Nutrient credits are in the process of being purchased from the Ivy Creek Nutrient Bank
3. Comment addressed.
4. Comment addressed.
5. Comment addressed.
6. Comment addressed.
7. Comment addressed.
8. Comment addressed.
9. Outfall of detention basin has been routed to a level spreader, which has been designed per VESCH
3.21. slope of outlet of lip of spreader is 8.33%, less than the allowable maximum of 10%. This allows
for a sheetflow of the outfall as in the existing condition, although post -developed flow is even less
than pre -developed flow, so existing condition has been improved upon.
10. Comment addressed.
11. Comment addressed.
12. Comment addressed.
13. An exception to allow great discharge than energy balance allows is enclosed along with $240 check
and a section has been added to the SWM calculations packet to compare 1-inch orifice flows vs. 3-
inch orifice flows.
D. Erosion and Sediment Control Plan (ESOP)
1. Comment addressed.
2. Comment addressed.
3. Comment addressed.
4. Comment addressed.
5. Comment addressed.
6. Comment addressed.
7. Comment addressed.
8. Comment addressed.
9. Sediment trap 1 outfall has been rotated and corrected to not outfall into the road.
Should you have any questions, please feel free to contact Scott Collins at Scott@collins-engineering.com.
Sincerely,
Scott Collins, PE