HomeMy WebLinkAboutWPO201200086 Correspondence 2020-07-27 (2)® COLLINS ENGINEERING
July 20, 2020
David James
Department of Community Development
401 McIntire Road
Charlottesville, VA 22902
20o GARRETT ST, SUITE K CHARLOTTESVILLE VA 22902
��434.293.3719 PH 434.293.2813 FX
www.coll ns-eng ineeri ng.com
RE: The Preserve at Glenmore (WP0201200086 Amendment 2)
Thank you for your comments dated March 5, 2020 on the above referenced project. Below are our detailed responses to your
comments. Should you have any questions during your review and approval of this project, feel free to contact Scott Collins at
scott(a7collins-eneineerine.com or at (434) 293-3719.
A. General
1. The plan reference number has been updated and provided on the cover sheet.
2. The applicant shall apply for a construction general permit for the project.
3. The applicant shall apply for and obtain state permit coverage prior to approval. The applicant will forward the signed
coverage letter shortly.
4. A SWPPP is included with this resubmittal.
B. Stormwater Pollution Prevention Plan (SWPPP)
1. A SWPPP is included with this resubmittal.
C. Pollution Prevention Plan (PPP)
1. A PPP is included with this resubmittal.
D. Stormwater Management Plan (SWMP)
1. The deed book and page number of the SWM facility existing easement is now provided on sheet 3.
2. The calculation package was prepared but inadvertently omitted from the submittal, please find updated calculation
package with this resubmittal.
3. Wet Pond
a. The labeling has been provided, the bottom of the main cell of the pond is 350.
b. The low flow orifice is now 5".
c. The flow path now meets the minimum 2:1 ratio requirement with the addition of a baffle.
d. The applicant acknowledges the pond embankment report requirement, this is now noted on plan sheet 3, note
number 5.
e. Per the BMP Clearinghouse Section 6.3 —Safety Features, a safety bench and aquatic bench are required when
pool depth exceeds four feet. The proposed minimum water surface elevation is 353.5, with a pond bottom of
350 allowing for 3.5' of permanent ponding during normal operating conditions, therefore a safety bench and
aquatic bench are not proposed.
f. See response (e) above.
g. A pond drain is now provided at the riser to allow the pond to be drained completely, see detail "Existing
Principal Spillway' detail on sheet 3.
h. Anti -seep collar design for the barrel is now provided, calculations are included on sheet 3, see detail "Existing
Principal Spillway'.
i. Is it a requirement for the RCP pipe to be installed in a concrete bedding? I am not aware of that design
requirement and not aware of this being done on other projects.
j. The bottom spot elevations at the forebay, mid -pond, and at the riser are now included on sheet 3, "Amended
Level 1 Wet Pond" detail.
k. A planting plan for the turf cover is now provided. The 25' vegetative buffer is now shown on sheet 3, see
"Amended Level 1 Wet Pond" detail.
I. The spillway is existing and shall be undisturbed. The recommended vegetative cover is now provided, see sheet
3 General Note 6 and Table C-1.
m. Facility maintenance and inspection notes are now provided on sheet 3.
E. Erosion and Sediment Control Plan (ESCP)
1. Comment addressed.
Sincerely,
Scott Collins