HomeMy WebLinkAboutWPO201900062 Plan - VSMP 2022-10-13•see
0 f 608 Preston Avenue
P 434.295.5624
Suite 200 IF434.295.1800
T I M M O N S GROUP
Charlottesville, VA 22903 www.timmons.com
October 13, 2022
Matt Wentland
Albemarle County Community Dev.
401 McIntire Rd, Rm. 227
Charlottesville, VA 22902
RE: Southwood Village 1 - Amendment 3 - VSMP Permit Plan Review— WP0201900062 —
Comment Response Letter
Dear Mr. Wentland:
We have reviewed all of your comments dated September 29, 2022 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. The existing Village 1 SWPPP will need to be updated once this plan is approved.
Acknowledged. The SWPPP will be updated upon plan approval.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code Section 17-404.
1. The existing Village 1 PPP will need to be updated once this plan is approved.
Acknowledged. The PPP will be updated upon plan approval.
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. This plan cannot be approved until the 0.09 Ib/yr of nutrient credits have been
purchased. Please contact Ana Kilmer prior to purchasing credits. Since this project
drains to impacted streams, the credits will need to be purchased from the Ivy Creek or
ENGINEERING I DESIGN I TECHNOLOGY
Rivanna River credit banks, since they are located in the same HUC8. [9VAC25-900-
91. B] .
Acknowledged. A comment on Southwood Village 2 WPO Plan led us to catch some water
quality calculation conflicts on the Southwood Village 1 WPO plan. Therefore, our required
nutrient credits to be purchased has increased to 0.24 pounds. See sheets C601-C6.02.
2. Ensure all the proposed grades tie into existing grades.
The proposed grading has been revised so that all proposed grades tie into existing grades.
3. Provide a design for the proposed ditch along the berm.
Ditch calculations for the proposed ditch along the berm have been provided on sheet C6.00.
4. The maximum allowable slope is 2:1.
The grading along the berm has been revised so that it does not exceed 2:1 slopes.
5. Provide more detail at the end of the berm. It doesn't appear that structure 502 (the
end of the culvert) is in a low point.
The grading has been revised to provide a low point at structure 502. See sheet C4.09 and
C7.00.
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. Show the drainage area to the proposed trap.
Drainage divides have been added on sheet C3.04.
2. Show silt fence at the base of the berm along Horizon.
Silt fence has been added to the base of the berm along Horizon. See sheet C3.08.
We have included PDF copies of the plans and calculations for your review. If you have any
questions or comments, please feel free to email me at clint.shifflett@timmons.com .
Sincerely,
Clint Shifflett, PE
Project Manager