SWG040096_Additional Information Request_20171220

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Energy. Mineral &
Land Resources
ENVIRONMENTAL QUALITY
December 20, 2017
Ms. Leslie Hartz
Atlantic Coast Pipeline, LLC
c/o Dominion Energy Transmission, Inc.
707 East Main Street
Richmond, VA 23219
Subject: Request for Additional Information #2
Stormwater Project No. SWG040096
Atlantic Coast Pipeline Project
Cumberland County
Dear Ms. Hartz:
ROY COOPER
Governor
MICHAEL S. RLGAN
sectelnr1
TRACY DAVIS
Dlre0w
The Division of Energy, Mineral and Land Resources (DEMLR), received additional
information for the subject Stormwater Management Permit Application for the subject project
on November 16, 2017. A preliminary review of that information has determined that the
application is not complete. The following information is needed to continue the stormwater
review:
1. Provide a breakdown of BUA that shows the existing, proposed total, and net increase of
BUA. At the scale of the drawings provided, it is not possible to determine this
information. [15A NCAC 02H .1042(2)(g)]
2. Provide a description in the narrative of the BMPs and/or SCMs used to treat stormwater
runoff from BUA. This was included for erosion control BMPs, but not post -
construction BMPs/SCMs applicable to this stormwater permit application. (ex. Sheet
flow and/or vegetated swales, etc.) [15A NCAC 02H .1041(h)(5)]
3. Valve site plans sht. 4646J & 4646L:
a. These plans must be sealed, signed, and dated. [ 15A NCAC 02H .1042(2)(g)]
b. Show all proposed contours/grading and drainage patterns. [15A NCAC
02H .1042(2)(g)]
4. Revise all road cross-sections to show all side slopes no steeper than 3:1; and that swales
must be vegetated. [15A NCAC 02H .1003(2)(c) & SWG040000]
5. Provide sht. 134 as it appears 22-042.AR1 extends onto that sht. not submitted.
Nothing Compares--.,-
SState of North Carolina I Environmental Quality I Energy, Mineral and Land Resources
512 N. Salisbury Street 1 1612 Mail Service Center I Raleigh, North Carolina 27699-1612
919 707 9200

6. Some of the detail numbers on the detail sheets are not consistent with the the matchline
labels.
7. Show details of the drainage to be added per note 9 of the access roads. Any new or
modified swales must have supporting calculations to demonstrate non-erosive flow for
the 10 -yr storm. [15A NCAC 02H .1003(2)(c)]
8. The proposed contractor yard in Cumberland County does not meet the requirements
under stormwater general permit SWG040000. Due to the extent of BUA proposed, and
length of time it will exist, an application for an individual permit must be submitted for
the contractor yard. Since it is greater than 24% BUA on that property, it will be
considered high density, and require properly sized SCMs that meet all MDC (ex.
wetpond(s), infiltration basin(s), etc.). The application form SWU-101 is available on our
website at: haps://deq.nc.gov/about/divisions/energy-mineral-land-resources/energy-
mineral-land-rules/stormwater-pro rg am/post-construction [15A NCAC 02H .1003]
9. Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, and 1 hardcopy of other
documents. [ 15A NCAC 02H .1042(2)] Pdfs must be uploaded using the form at:
https:Hedocs.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 January 20, 2017, or
the application will be returned as incomplete. The return of a project will necessitate
resubmittal of all required items, including the application fee.
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.
Please reference the State assigned project number SWG040096 on all correspondence. If you
have any questions concerning this matter please feel free to contact me at
Robert.Patterson(a�ncdenr.gov or [phone].
Sincerely,
Robert D. Patterson, PE
Environmental Engineer
Stormwater Program
Nothing Compares --.,-
State of North Carolina Environmental Quality Energy, Mineral and Land Resources
512N. Salisbury Street 1612 Mail Service Center Raleigh, North Carolina 27699-1612
919 707 9200

ec: Tim LaBounty, PE - Fayetteville Regional Office
Tiffin Smith - ERM
Nothing Compares,—
State of North Carolina Environmental Quality Energy, Mineral and Land Resources
512N. Salisbury Street 1612 Mail Service Center Raleigh, North Carolina 27699-1612
919 707 9200