SW6221101_Add Info_20230214

"STATE aFA'
°E
ROY COOPER 5 A
Governor
ELIZABETH S.BISER L,z.
Secretary
DOUGLAS R.ANSEL NORTH CAROLINA
Interim Director Environmental Quality
February 14, 2023
Exp Federal, Inc.
Attn: Lorraine Roberts, PE
205 N. Michigan Avenue, Suite 3800
Chicago, IL 60601
AND
Fort Bragg Department of Public Works
Attn: David A. Heins, Environmental Division Chief
2175 Reilly Road Stop A
Fort Bragg, NC 28310-5000
Subject: Request for Additional Information
Stormwater Permit No. SW6221101
Fort Bragg,North Carolina Technical Support Annex, PN79439.2
Cumberland County
Dear Mrs. Roberts and Mr. Heins:
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on November 17, 2022. A review of that
information has determined that the application is not complete. The following information is
needed to continue the stormwater review:
1. As designed, this project does not appear to meet Runoff Treatment, as required per 15A
NCAC 02H .1003(3)(a) and defined in 15A NCAC 02H .1002(43). Please ensure that the
net increase in BUA is being captured and treated in one or more primary SCMs. NOTE:
Dry Ponds are not considered to be Primary SCMs per 15A NCAC 02H .1002(37).
NOTE: The submittal items do not indicate any existing BUA associated with this
project. Please revise as needed.
2. Please QA/QC the submission for consistency. For example, the drainage area to
bioretention cell B5 is shown as 47,916 sf(1.1 ac) in the Application (Section IV, 10),
1.07 ac in the calculations (Inlet Capacity for IN-135), and 1.0 ac in the plans (Plan sheet
CE602). Similar issues exist for the other SCMs and other aspects of the design. Please
revise as needed.
D E Q�� 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 _
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3. As previously indicated, a Dry Pond is not a Primary SCM and was not reviewed for
compliance with the MDCs. If you would like us to consider the treatment train provided
by the bioretention cells and dry pond in series as a combination of primary and
secondary SCMs that provides equal or better treatment then what is required per 15A
NCAC 02H .1003(2)(43), you will need to demonstrate this.
4. The water quality volume for a bioretention cell is stored above the planting surface and
below the invert of the lowest bypass elevation (not within the bioretention media as
shown in the calculations). Please revise as needed. You will either need to provide a
stage-storage table for each bioretention cell or calculate the storage volume as the
bottom surface area of the bioretention cell multiplied by the ponding depth.
5. Please clearly indicate the project area in the plan set (required per 15A NCAC
02H .1042(2)(g)(ii)). Typically, the project area corresponds to the property area,
however, in situations like this where the total property area is significantly larger than
the project area, a more suitable project area can be used (the limit of disturbance is
commonly used in situations like this, however, you can use any appropriate project area
so long as it includes the entire area to be covered under this permit and doesn't overlap
the project area of a different permit). Either way, please clearly indicate this project area
boundary on the plans.
6. Please correct the following issues with the Supplement-EZ Form:
a. Cover Page:
i. Line 7—Please include this value as required per 15A NCAC 02H .1003(4)
& .1017(10). It is noted that there are no surface waters located on-site, however,
we ask that this value is included on this form.
ii. Line 22—Revise as needed.
b. Drainage Area Page:
i. General:
1. Lines 7 & 11 —Off-site areas refer to areas that are located outside of the
project area. Portions of a drainage area that are located outside of the project
area must be accounted for at their full built-out potential. Typically, this is
accomplished by assuming that the off-site area is 100% BUA (its full build-
out potential) however, since Fort Bragg will also own the off-site areas, this
100% assumption does not need to be made.
2. Lines 15 & 17 —Please ensure that any existing BUA is accounted for on these
Lines (otherwise you don't get credit for these areas). NOTE: you are only
required to capture and treat the difference in BUA from existing to proposed
conditions.
ii. Entire Site Column:
1. Lines 19-21 —These items are not required for this column.
2. Revise as needed per earlier comments. NOTE: The entire site column is an
accounting of the entire project area (similar to how the drainage area columns
are an accounting of the drainage area to the SCMs. When asked for the
"drainage area" of the entire site, it is asking for the project area.

iii. Drainage Area Columns:
1. Lines 5 & 6—Please revise the drainage areas to the SCMs as needed.
2. Line 10—This item should be a sum of the items in Line 12
3. Line 12, Other—Please include this information if located within the drainage
areas to the SCMs.
c. Bioretention Cell Page:
i. Lines 12, 14, & 15 —Since this project is located at Fort Bragg, easements and a
standard O&M Agreement are not required. Please revise as needed and provide a
brief explanation in the Additional Information section (Line 44).
ii. Line 18—Please include the S14WT elevation. If the SHWT was not encountered
above a certain elevation, please list the lowest boring elevation that the SHWT
was not encountered at. For example, if the boring terminated at elevation 100'
without encountering the SHWT, you can answer"100" or"<100" for this item.
iii. Line 22—See earlier comment.
iv. Line 26—Per the provided percolation tests, the soil infiltration rate is closer to 0
in/hr. Please revise as needed so this information corresponds with the soil boring
information.
v. Line 30, Column B5 —This value (267) does not correspond to the plans or other
submittal documents.
vi. Line 32—Per Bioretention MDC 5(b)(ii), the minimum required depth of media
for a bioretention cell with IWS and no trees/shrubs is 30" (24" inches is provided
in the design. Please revise as needed.
vii. Line 43 —Please clarify how grass/gravel will be used as pretreatment for the
bioretention cells.
7. Provide PDFs of all revisions, 2 hardcopies of revised plan sheets, 1 hardcopy of other
documents, and a response to comments letter briefly describing how the comments have
been addressed.
a. PDFs must be uploaded using the form at:
https://edocs.deq.nc.gov/Forms/SW-Supplemental-Upload
b. Hard copies must be mailed or delivered to the following address:
i. For FedEx/UPS:
Jim Farkas
512 N. Salisbury Street, Office 640M
Raleigh, NC 27604
ii. For LISPS:
Jim Farkas
1612 Mail Service Center
Raleigh, NC 27699-1612
iii. Hand Delivery:
Please reach out to me prior to hand delivering a submission to make sure that I
(or someone else in my group) will be able to receive the submission. Do not
leave the package in the foyer with the security guard.

NOTE: Hard copies should not be sent to a Regional Office. Doing so will delay
the review process and the submission package may be lost while being sent from
the Regional Office to me in the Central Office.
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 March 16, 2023, 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 SW6221101 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(919) 707-3646.
Sincerely,
Jim Farkas
State Stormwater Engineer
DEMLR Post-Construction Stormwater Program
cc: Fayetteville Regional Office