SW1231201_Response To Comments_20240626

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June 26, 2024
Jim Farkas
State Stormwater Engineer
North Carolina Department of Environmental Quality
512 N. Salisbury Street, Office 640M
Raleigh, NC 27604
RE: Project name: Bobby N. Setzer State Fish Hatchery Renovation
Project No.: SW1231201
Location: Transylvania County
Additional Information Request date: June 24, 2024
Dear Mr. Farkas,
Thank you for your review of the stormwater permit submittal for this project. Below are our
responses to your comments that I received via email on June 24, 2024. Your comments are
shown in italics followed by McGill's bolded responses.
I) Storm water Wetland MDC 6—As designed, the forebay is too deep. Per the plans, the bottom
of the forebay near the entrance is at elevation 2329.17'and the permanent pool surface is at
elevation 2333.0' (a difference of 46" which is larger than the maximum forebay depth of 40"
per the MDC). Please revise as needed.
The forebay depth has been adjusted to reflect a 40" maximum depth. Sheet C-
143 — Wetland Plan and Details has been adjusted. Note that from previous
submittals, the wetland detail sheet was numbered as C-140; additional sheets
unrelated to stormwater and did not include design changes, were added to the
set. The wetland page within the Supplement-EZ form has also been updated.
2) Please note that the following language (or similar language) will be included in this permit,
no further action is needed. "ALTERNATIVE DESIGNS. The stormwater system is permitted
as a variation to the requirements per 15A NCAC 02H.1003(6). Untreated stormwater runoff
is being discharged through the Davidson River vegetated setback, as it was in existing
conditions, due to topographical site constraints. To mitigate this, the proposed SCM has
been designed to capture and treat 1.18 acres of existing BUA that would otherwise not be
required to be captured and treated in an SCM for this project. In addition, Headwalls A & C
have been outfitted with 6 inch by 6 inch by 6 foot long impact curbs to distribute the flow and
reduce the potential for downstream erosion from these ouffalls. The proposed system has
been found to provide equal or better stormwater control and equal or better protection of
surface waters. If the proposed design fails and no longer meets the intent of the stormwater
rules, a modification must be submitted to either meet the requirements or propose another
variation from the rules. This is based on a case-by-case decision and should not be used as
MCGILL ASSOCIATES 55 BROAD STREET, ASHEVILLE, NC 28801 /828.252.0575/MCGILLASSOCIATES.COM

a precedent for future permitting actions. The issuance of this permit does not preclude the
permittee from obtaining and complying with any and all other permits or approvals that are
required for this development to take place, as required by any statutes, rules, regulations, or
ordinances, which are imposed by any other Local, State or Federal government agency
having jurisdiction, in particular, water quality standards with regard to surface waters
classified as "Trout waters" per 15A NCAC 02B .0101. Any activities undertaken at this site
that cause a water quality violation or undertaken prior to receipt of the necessary permits or
approvals to do so are considered violations of NCGS 143-215,1, and subject to enforcement
procedures pursuant to NCGS 143-215.6."
Understood.
In addition to this response letter, the below items have been included in this resubmittal package.
PDF copies of the below documents have been uploaded to the appropriate location.
• One (1) hardcopy of revised Supplement-EZ Form
• Two (2) hardcopies of revised sheet C-143 Wetland Plan and Details
If you have any questions or require additional information, please feel free to contact me at 828-
252-0575 or [e-mail].
Sincerely,
McGILL ASSOCIATES, P.A.
NATALIE CROOM, PE
Project Engineer
P:`2019119.00124-NCWRC-Bobby N Setzer State Fish HatchetDesign\Permits\Stormwater12024-06-26 Resubmittal\Soutees;19,00124-Response
Litter-Storm-062624.docx