SW5180301_Add Info Request_20180411

Energy, Mineral
and Land Resources
ENVIRONMENTAL QUALITY
April 11, 2018
T. Chase Massey, PE
FLM Engineering, Inc.
P.O. Box 91727
Raleigh, NC 27675
Subject: Request for Additional Information
Stormwater Permit No. SW5180301
Crawford Townes — Franklinton, NC
Franklin. County
Dear Mr. Massey,
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
WILLIAM E. TORY VINSON, JR.
Interim Director
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on March 19, 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. Please provide a signed and notarized Operation and Maintenance Agreement.
2. Please provide a detail depicting the forebay, including the forebay depth and elevations
of the forebay inlet and outlet.
3. Please provide calculations demonstrating that the proposed riprap apron is sufficient to
prevent erosion as a result of discharges from the SCM.
4. Please revise the SCM design to address the following deficiencies:
a. The detail on Sheet C-9 shows that the forebay comprises approximately half the
surface area noted in the Supplement Form. Therefore, is comprises less than 10
percent of the wetland surface area. The forebay must comprise 10 to 15 percent
of the wetland surface area.
b. The drawdown time calculations do not accurately calculate the drawdown time
from the SCM. The actual drawdown time under the proposed conditions is below
the minimum of two days. Please revise the design to ensure the design volume
will drain to the permanent pool level in between two to five days.
5. Please provide a landscape plan that shows the delineation of planting zones and the plant
layout with species names and locations.

6. Provide pdfs of all revisions, 2 hardeopies of revised plan sheets, and 1 hardcopy of other
documents. Pdfs must be uploaded using the form at:
htt s://edocs.de .nc. ov/Forms/SW Project Submittal
PIease 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 May 4, 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 SW5180301 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. Anengnedenr•gov or [phone].
Sincerely,
40-
Corey Anen
Environmental Engineer
Stormwater Program
cc: Raleigh Regional Office
Bill Wynn - Crosswinds Development
Jason Gordon - Crosswinds Development
Nothing Compares -,,,,-
State of North Carolina Environmental Quality I Energy, Mineral and Land Resources
512 N. Salisbury Street f 1612 Mail Service Center I Raleigh, North Carolina 27699-1612
919 707 9200