SW6191001_Add Info_20191106

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
Lars O. Godwin, PE
22 Long Ridge Court
Willow Springs, NC 27592
NORTH CAROLINA
Environmental Quality
November 6, 2019
Subject: Request for Additional Information
Stormwater Permit No. SW6191001
Yard Storage, Inc.
Harnett County
Dear Mr. Godwin:
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on October 7, 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 ensure that the drainage area to the facility is properly reflected in Section IV, 10,
the Supplement-EZ, and the provided calculations. The entire site does not drain to the
proposed SCM (For example the northeast corner of the property where the overflow
pipe is located).
2. Please initial items in Section VI that are included with the application.
3. Please provide a title sheet for the plans with the following information:
a. The project name (Section VI, 8, a).
b. The engineer and firm name (Section VI, 8, b).
c. A project location map (Section VI, 8, c).
4. Please add the following items to the provided plan sheet:
a. A scale bar was included for the infiltration basin cross-section, please provide
one for the main site (Section VI, 8, f).
b. A table showing the bearings and distances for property lines L1 — L9 (Section
VI, 8, i).
c. A drainage area delineation for the proposed SCM (Section VI, 8, o).
d. A maintenance access and easement (General MDC 8 & 9).
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

5. Please provide calculations showing that the inlets and outlet to the SCM are adequately
protected from erosion (General MDC 4).
6. Based on the provided calculations, it appears that the infiltration basin is not adequately
sized. Using the equation found under the Infiltration MDC 5 section of the Manual and
the information from the plan set yields a minimum required surface area of 3217.8 sf
[SA = FS * (DV * 12)/(K * T) -> 3217.8 sf = 2.0 * (5792 cf * 12)/(0.6 in/hr * 72 hr)]
7. The Ecorain tank sizing calculations (307 modules @ 41'L x 25'W x 7.3'H) do not
match the plans (45'L x 21.44'W x 7.12'). Please revise for consistency.
8. Please correct the following issues with the Supplement-EZ form:
a. Drainage Area Sheet:
i. The "Entire Site" column should contain the information for the entire site
(i.e. everything within the property boundary) and the "1" column should
only contain the information for the area draining to the proposed SCM.
b. Infiltration System Sheet:
i. Line 12 — The drainage easement must comply with MDC 9.
ii. Line 14 — The O&M Agreement must comply with MDC 11.
M . Line 15 — The O&M Plan must comply with MDC 12.
iv. Line 16 — If the proposed SCM does not follow the device specific MDC,
please provide documentation per 15A NCAC 02H .1003(6)(a). If the
MDCs are met, please indicate "Yes" for this item.
v. Line 17 — The SCM must be designed by an NC licensed professional.
vi. Line 18 — Please indicate the slope of the excavated bottom of the
proposed SCM.
vii. Line 27 — Factor of safety (2.0) does not match provided calculations.
viii. Lines 32 & 33 — The surface area (1025 sf) does not match the plans.
9. 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:
hgps://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 December 6, 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 SW6191001 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,
V- "I
Jim Farkas
Environmental Engineer
Stormwater Program
cc: Fayetteville Regional Office