SW6190701_Add Info_20190823

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
C. Scott Brown, PE
409 Chicago Drive, Suite 112
Fayetteville, NC 28306
NORTH CAROLINA
Environmental Quality
August 23, 2019
Subject: Request for Additional Information
Stormwater Permit No. SW6190701
The Farms Subdivision
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 July 26, 2019. A review of that
information has determined that the application is not complete. The following information is
needed to continue the stormwater review:
1. The project is over 24% impervious cover. The absolute maximum allowable BUA for
this project is 239,614.8 sf (24% * 998,395 sf) and 239,615 sf are proposed. Please revise
the BUA allotment so that the percent BUA for this project is no greater than 24% or
satisfy the requirements for a high density project (Section II, 2).
2. Please fill out "Table 1" and provide item "j" of the Required Items Checklist for the low
density supplemental form (Section V). Items "d" and "i" of the Required Items Checklist
have been provided but should be indicated on the checklist.
3. Please provide calculations showing how the times of concentration were determined for
the swale calculations (Section VI, 7).
4. Please provide property lines with bearings and distances in the plans (Section VI, 8, i).
5. Please provide documentation of the qualifications and identity of the individual who
made the wetland delineation (Section VI, 8, m).
6. The property owner authorization is not needed since the applicant is the property owner
(Section IX).
D EQ 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 _
o.PaWnamofEnvironmental Quality /� 919.707.9200

7. The manning n values used in the swale calculations seem very high for grass swales
with a water depth of about 1 — 2 feet. Typically, grassed channels have n values in the
range of 0.03 to 0.06, depending on the height of grass and depth of water. Please provide
justification for using the values you selected or redo the calculations with more typical
values.
8. 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:
https://edocs.deq.nc.gov/Forms/SW—Project—Submittal
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 September 22, 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 SW6190701 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
[e-mail] or [phone].
Sincerely,
Jim Farkas
Environmental Engineer
Stormwater Program
cc: Fayetteville Regional Office