SW3190702_AddInfoRequest_20191005

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
Mr. Mason Greeson
LandDesign
223 N. Graham Street
Charlotte, NC 28202
NORTH CAROLINA
Environmental Quality
October 5, 2019
Subject: Request for Additional Information
Stormwater Permit No. SW3190702
Weddington Pointe
Union County
Dear Mr. Greeson:
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on July 30, 2019. A review of that
information has determined that the application is not complete. The following information is
needed to continue the stormwater review:
Please update the drainage area table in Part IV of the application to include the receiving
stream name, stream class, and stream index number. This information can be found
using the Surface Water Body Classification Map.
2. Please update the calculations to use only the main pool and exclude the forebay when
calculating the SA/DA ratio and average depth (Wet Pond MDC 1 and 2).
3. Please use the orifice equation as outlined in Part B of the Stormwater Design Manual
when calculating the drawdown time.
4. How was the temporary pool elevation for the wet ponds calculated? Note that it is not
acceptable to use routing calculations as the MDC are based on runoff volumes from a 1"
event, not flow rates from a 1 inch, 24-hour event.
5. Please submit a planting plan for the wet ponds that meets the requirements of Wet Pond
MDC 11.
6. Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, and 1 hardcopy of other
documents. Pdfs must be uploaded using the form at:
hltps:Hedocs.deq.nc.gov/Forms/SW ProjectSubmittal
D EQ �� North Carolina Department of Environmental Quality Division of Energy, Mineral and Land Resources
512 North Salisbury Street 1 1612 Mail Service Center I Raleigh, North Carolina 27699-1612
NORTH CAROLINA
Depadm.mofEnmmnm.maaualfty /� 919.707.9200

Please note that this request for additional information is in response to a preliminary review.
The requested information should be received by this Office prior to November 4, 2019, or
the application will be returned as incomplete. The return of a project will necessitate
resubmittal of all required items, including the application fee. Please reference the State
assigned project number SW3190702 on all correspondence.
If you need additional time to submit the information, please submit your request for a time
extension to the Division at the contact below. The request must indicate the date by which you
expect to submit the required information. The Division is allowed 90 days from the receipt of
a completed application to issue the permit.
The construction of any impervious surfaces, other than a construction entrance under an
approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject
to enforcement action pursuant to NCGS 143-215.6A.
If you have any questions concerning this matter please feel free to contact me at
Corey.Anen&ncdenr.gov or [phone].
Sincerely,
Corey Anen
Environmental Engineer
Stormwater Program
cc: Mooresville Regional Office