SW1191201_Add Info_20200117

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
Francis Slinsky, PE
5410 Trinity Road
Raleigh, NC 27607
NORTH CAROLINA
Environmental Quality
January 17, 2020
Subject: Request for Additional Information
Stormwater Permit No. SW1191201
NCNG Morganton Regional Readiness Center
Burke County
Dear Mr. Slinsky:
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on December 18, 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. Please provide some documentation showing that Rodney Newton can sign on behalf of
the Applicant (Section III, la).
2. Please provide the information of the local jurisdiction that will be issuing the building
permit (Section III, 4).
3. The river basin that this project is located in is just "Catawba" (Section IV, 3). Please
revise.
4. The information provided in the table in Section IV, 10 does not match the information
provided in the Supplement-EZ Form. Please address the following:
a. The "Total Drainage Area" item should be the sum of the "On -site Drainage
Area" and the "Off -site Drainage Area" items.
b. The "Proposed Impervious Area" item should be equal to the "Total" item from
the "Impervious Surface Area" table.
c. The "Existing BUA" item should be the amount of BUA within the drainage area
pre -construction. Existing BUA that is removed and replaced is not reported as
new BUA, but rather as existing BUA.
d. The "% Impervious Area" item should be the "Total" impervious area divided by
the "Total Drainage Area", expressed as a percent.
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 indicate how the off -site impervious area was determined (Section IV, 11).
6. Please provide hard copies of the Supplement-EZ Form and O&M Agreement Form with
original signatures and seals (Section V & Section VI, 3).
7. Please provide original initials next to each included item Section VI). Items that are not
included can be marked with "N/A".
8. Please provide a hard copy of the Application with original signatures and seals (Section
VI, 1).
9. Please show the property lines, with bearings and distances, on the plans (Section VI, 8i).
10. Please dimension the BUA on the plans (Section VI, 8j). The information provided in
Section IV, 10 and the Supplement-EZ Form should be able to be verified on the plan
sheets.
11. Please delineate the wetlands on the plans or provide a note stating that no wetlands exist.
Provide documentation of the qualifications and identity of the individual who made this
determination (Section VI, 8m).
12. Please provide riprap sizing calculations showing that the inlets and outlet of the wet
pond are stable during the 10-year storm event (General MDC 4).
13. As designed, the forebay is too large (Wet Pond MDC 5a). The forebay volume needs to
be between 15-20% of the main pool volume. Please revise.
14. Please provide a planting plan for the proposed wet pond (Wet Pond MDC 11).
15. Please correct the following issues with the Supplement-EZ Form:
a. Cover Sheet:
i. Line 2 — The project area should match Section IV, 7 of the Application.
b. Drainage Area Sheet:
i. Please fill out the "Entire Site" column.
ii. Line 13 — See comment 4c prior.
iii. Line 15 — Since there is a net increase in BUA from pre -construction to
post -construction, do not include this item.
iv. Line 16 — See comment 4d prior.
c. Wet Pond Sheet:
i. Line 3 — The SCM should be sized to treat all surfaces at build -out
(General MDC 1).
ii. Line 12 — Since this is not privately owned land, this item should be
"N/A" and an explanation of why it is "N/A" should be put on Line 55.
iii. Line 14 — The O&M Agreement should comply with General MDC 11.
iv. Line 15 — The O&M Plan should comply with General MDC 12.

v. Line 26 — Per the calculations, the surface area of the main pool is only
19,145 sf.
vi. Line 28 — Please calculate the average depth of the wet pond using either
Equation 2 or Equation 3 from Part C-3 of the Manual.
vii. Line 34 — the cleanout depth of the forebay is the distance between the
permanent pool elevation and the top of the sediment storage elevation.
viii. Lines 43 and/or 44 — Wet Pond MDC 5b requires that the forebay entrance
be deeper than the forebay exit.
16. Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, and l hardcopy of other
documents. Pdfs must be uploaded using the form at:
hgps://edocs.deq.nc.gov/Forms/SW Project Submittal
While it is not required, it is recommended that the off -site drainage from upstream properties
be diverted around the SCM since the applicant cannot maintain control over the development of
property that they do not own.
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 February 16, 2020, 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 SW1191201 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,
)6m" I jwt�
Jim Farkas
Environmental Engineer
Stormwater Program
cc: Asheville Regional Office