SW1190501_AddInfo_20190613

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Interim Director
Mr. Travis Maxwell
Brooks Engineering Associates, PA
17 Arlington Street
Asheville, NC 28801
NORTH CAROLINA
Environmental Quality
June 13, 2019
Subject: Request for Additional Information
Stormwater Permit No. SW1190501
North Buncombe Middle School Bus Lot
Buncombe County
Dear Mr. Maxwell:
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on May 16, 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. Soil testing is required to determine the depth to the seasonal high water table to ensure
that the required 2-foot separation is maintained (Bioretention MDC 1). Were tests
conducted to identify the seasonal high water table?
2. The bioretention cell detail on Sheet C-5.2 indicates that the internal water storage will be
1 foot below the planting surface. Bioretention MDC 4 requires that the internal water
storage be set at a minimum of 18 inches below the planting surface. In addition, the
detail appears to indicate that the orifice discharges directly into the outlet structure and
the pipe connected to the internal water storage is set at a higher elevation than the
underdrain.
3. The plans and calculations indicate that the underdrain pipe has a diameter of 4 inches;
however, the outlet detail on Sheet C-5.2 labels it as 6 inches. Please update the detail to
match the plans.
4. Please complete and submit a Supplement EZ form for the bioretention cell. The
Supplement EZ form is an updated for of the supplement that was originally submitted
and better reflects the current stormwater regulations. The form can be found here:
httDS:Hdea .nc. 2ov/about/divisions/ener2v-mineral-land-resources/enerLv-mineral-land-
ermit-guidance/stormwater-bmp-manual.
DNorth Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
E Q��
_ 512 North Salisbury Street 1 1612 Mail Service Center I Raleigh, North Carolina 27699-1612
NORTH CAROLINA
Department or Emironmeatal mail� 919.707.9200

5. 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:
hltps:Hedocs.deq.nc.gov/Forms/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 July 13, 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 SW1190501 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].
Sincerely,
Corey Anen
Environmental Engineer
Stormwater Program
cc: Asheville Regional Office