HomeMy WebLinkAboutWPO201300035 Review Comments 2013-05-13Project Name:
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Review Comments
Hollymead Substation
Monday, September 09, 2013
Ana Kilmer
CommDev-Central Ops
Erosion and Sediment Control Plan
9/9/2013 - SWA recorded on DEED BOOK 4409, page 652
Approved
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
Phone (434) 296-5832 Fax (434) 972-4126
Project: Hollymead Substation Expansion- Minor Amendment to SDP-1984-60
Plan preparer: Geosyntec Consultants [fax 804-767-2182]
Owner or rep.: Virginia Electric & Power CO
Plan received date: 22 Apr 2013
Date of comments: 13 Jun 2013
Reviewer: Michelle Roberge
A. E& S Plan and SWM
1. Please show the drainage easements within the property boundary.Comment addressed.
2. The property drains into a lake managed by the Forest Lakes Community. Per Section 17.314 and
section 17.315, water quality and quantity will need to be addressed. A WPO application can be
filled out for the stormwater management and erosion and sediment control review. The load
reduction calculation spreadsheet can be found on our website,
www.albemarle.org/deptforms.asp?department=cdd. The file name is Plan Review BMP Removal
Rate Computations.
[Revision1] Comment partially addressed. Albemarle County still requires water quality to
be addressed [Section 17-315]. One option is to place a grass swale just north of stormsewer
and running parallel to stormsewer. The grass swale can serve as treatment before entering
the drainage system at STR-3 or STR 1 and 5. Also, please provide the following corrections
and address the remaining stormwater management comments below :
a) The removal rate computations has an incorrect area. Please change to 1.91
acres and not 6.72 acres. The area just north of property is being developed
which reduced the runoff to this site. Please revise all calcs and drainage
areas.
b) The stormsewer should be designed to handle the 10 year storm [Section 17-
314]. Please also include the 10 yr storm analysis. It appears with a 10 year
storm, increasing STR 6 to be 92’ long will be adequate. The steel plate and
9” orifice can be removed, but a grate shall be installed to prevent clogging
in the 12” pipe.
3. Please show the the VDOT Flared End Section ES-1 for the outlet pipe. Comment addressed. A
12” outlet pipe will be anchored in retaining wall.
4. The area between the proposed grate inlets will start ponding. Please revise to prevent ponding.
Comment addressed.
5. Please provide the detail of the 1’ wide wall located south of site. Comment addressed.
6. On sheets 5 and 9 for post development, please do not show the grate inlet and pipe to be
removed. Comment addressed.
7. Please revise E2 to be a 24” RCP outlet pipe. Comment addressed. The outlet pipe was revised
to 12”.
8. The site will eventually drain into (2) – 12” DIP before entering the pond. Please replace pipes
with a 24” RCP. This will require permission from the Forest Lakes Community Association, Inc.
Please provide. Comment addressed. The pipes do not need to be replaced.
Sincerely,
Michelle Roberge