SW6210101_Add Info Request_20210309

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
BRIAN WRENN
Director
Scott Brown, PE
4D Site Solutions, Inc.
409 Chicago Drive, Suite 112
Fayetteville, NC 28306
NORTH CAROLINA
Environmental Quality
March 9, 2021
Subject: Request for Additional Information
Stormwater Permit No. SW6210101
Grays Creek Safe Storage
Cumberland County
Dear Mr. Brown:
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on January 21, 2021. A review of that
information has determined that the application is not complete. The following information is
needed to continue the stormwater review:
1. Please provide a geotechnical report showing the seasonal high water table and hydraulic
conductivity of the soil within the footprint of the proposed infiltration basin (Infiltration
MDC 1).
2. The document entitled "1729 Volumes Required" shows the calculation for the water
quality volume as 9,122 cf and the provided volume as 5,930 cf. The provided volume
does not match what is shown in the stage -storage and on the plans and is less than the
water quality volume. Please revise this document to show the design volume below the
emergency spillway.
3. The drawdown time calculation uses 5,930 cf for the design volume instead of the water
quality volume of 9,122 cf. Please revise these calculations to use the proper volume.
Please also show the calculation using Equation 2 from Chapter C-1 of the Stormwater
Design Manual.
4. 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:
hqps:Hedocs.deq.nc.gov/Fonns/SW ProjectSubmittal
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 April 8, 2021, or the
application will be returned as incomplete. The return of a project will necessitate resubmittal
D E Q173]�� North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
512 North Salisbury Street 1 1612 Mail Service Center I Raleigh, North Carolina 27699-1612
NORTH CAROLINA �
oepanmem of enmmnmemm Quail� 919.707.9200

of all required items, including the application fee. Please reference the State assigned project
number SW6210101 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]. Please note that due to the ongoing Covid-19
pandemic, I will be teleworking and will be most easily reached by email.
Sincerely,
Steven Corey Anen, PE
Environmental Engineer
Stormwater Program
cc: Fayetteville Regional Office