SW52180401_AddInfoRequest_20180503

Energy, Mineral
and Land Resources
ENVIRONMENTAL QUALITY
May 3, 2018
Mr. Gary J. McCabe, PE
Red Line Engineering, PC
1401 Aversboro Road
Garner, NC 27529
Subject: Request for Additional Information
Stormwater Permit No. SW5180401
Duncan Industrial Park — Fuquay-Varina, NC
Harnett County
Dear Mr. McCabe:
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
WILLIAM E. TOBY VINSON, JR.
Interim Director
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on April 26, 2018. A review of that
information has determined that the application is not complete. The following information is
needed to continue the stormwater review:
1. As currently designed, the project does not meet the requirement for runoff treatment or
runoff volume match. Please revise the plans to utilize a Primary SCM, as defined in 15A
NCAC 02H .1002, to meet one of these requirements.
2. Please provide pre- and post -development drainage area maps that delineate the drainage
area to the SCM.
3. Please delineate any wetlands or mark on the plans that none exist.
4. Please provide a completed Supplement EZ form.
5. Please revise Item 8 in the Project Information of section of the SWU-101 form and
calculate the percent impervious coverage using the total project area rather than the total
property area.
6. Please provide a breakdown of BUA as required in Item 10 in the Project Information
section of the SWU-101 form. Note that this is the total proposed impervious area, not
the total new impervious area.
7. The Storm EZ calculations currently show the entire site draining to the SCM. Please
revise the Storm EZ spreadsheets to show only the actual contributing area to the basin.

8. The Storm EZ calculations should only include the total project area, not the pond area.
Please revise the Storm EZ spreadsheets to only take into account the existing and
proposed open space and impervious surface.
9. Revise the plans to show a maintenance access and easement that extend to the nearest
right-of-way. The maintenance access must be at least 10' wide and have side slopes no
steeper than 3:1 (horizontal to vertical). The easement must contain the entire
maintenance access and SCM.
10. Based on the proposed grading, a portion of the proposed impervious area on the
northwestern part of the site will not be conveyed to the SCM and will instead flow
directly into the pond without treatment. This runoff must be captured and treated prior to
discharge.
11. Please explain how the gravel stockpile area will be used. Note that any water discharged
from the hopper, wash pits, or used to irrigate the gravel or any other aggregate is
considered a wastewater discharge and cannot be discharged into the proposed SCM. In
addition to a state stormwater permit, this facility will most likely require coverage under
the NCG140000 general industrial stormwater permit, which covers facilities primarily
engaged in ready mix concrete and like activities (SIC 3273). Also note that any runoff
from a gravel stockpile cannot be discharged into a bioretention system or sand filter due
to the potential for clogging the filter media.
12. 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.deg.nc.gov/Fort-ns/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 June 3, 2018, 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 SW5180401 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(cncdenr.gov or [phone].
Nothing Compares.
State of North Carolina I Environmental Quality I Energy, Mineral and Land Resources
512 N. Salisbury Street 1 1612 Maii Service Center I Raleigh, Nort hCaroiina27699-1612
919 707 9200

cc: Fayetteville Regional Office
Ronald Currin — RP One, LLC
Sincerely,
�& % 64'—
Corey Anen
Environmental Engineer
Stormwater Program
Nothing Compares.
State of North Carolina I Environmental Quality I Energy, Mineral and Land Resources
512 N. Salisbury Street 1 1612 Maii Service Center I Raleigh, Nort hCaroiina27699-1612
919 707 9200