SW5220101_Response To Comments_20220728

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July 18, 2022
Jim Farkas
North Carolina Department of Environmental Quality
RESPONSE TO COMMENTS > 2021110321
Division of Energy, Mineral, & Land Resources — Stormwater Program
512 N. Salisbury Street
Raleigh, North Carolina 27699-1612
RE: Hardees - Main St - Bunn, NC
Response to 3rd Stormwater Comments
2021110321
The following are the response comments for the above -mentioned project. Our response comments are in bold.
STORMWATER PROGRAM
Jim Farkas 919. 707. 3646
Prior Comment 4:
1. It appears as though this project is being subdivided. Subdivided projects are required to have deed restrictions
per 15A NCAC 02H .1042(2)(k) so that the capacity of the SCM is not exceeded. Example deed restriction
language can be found on our website: https://deq.nc.gov/about/divisions/energy-mineral-and-land-
resources/stormwater/stormwater-program/post-construction-program/post-construction-forms NOTE: We
require an original, signed "& notarized hard copy of the deed restriction form but you may wish to get a second
original signed & notarized copy of that form for the Applicant's records (they will need it to record with the
Register of Deeds).
McAdams Response: A signed/Notarized Deed Restriction form is included with this submission as
requested.
Supplement-EZ Form:
2. Drainage Areas Page:
> Entire Site Column —The entire site column should include all of the BUA that will exist within the entire site,
even if it does not drain to the proposed SCM. The provided drainage area map indicates that a portion of
the new BUA located by the west site entrance does not drain to the SCM. This BUA should be included in
the entire site column (since it is being added to the site) but should not be included in the SCM drainage
area (since it is not draining to the SCM). In order to meet Runoff Treatment, the net increase in BUA must
be captured and treated within one or more primary SCMs. If it is not possible or practical to direct the net
increase in BUA into one ore more primary SCMs, the portions of the project area that do not drain to the
SCM(s) can be permitted as a low -density drainage area (provided that these areas meet the low -density
creating experiences through experience 2905 Meridian Parkway, Durham, NC 27713 / 919. 361. 5000

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RESPONSE TO COMMENTS > 2021110321
design requirements). If this option is also not possible/practicable and the amount of BUA is
minimized/justifiable we can allow it via a variance (we can set up a video call if this is the case).
McAdams Response: The Supplement has been revised to indicated both high and low density. The
"entire site" column was actually correct previously, but the sub basins not clearly shown. We have added
two LID subbasins and LID worksheets for each. A new signed application is also included that shows the LID
areas also. From the directions, it appeared that we should combine the LID areas into one entry (1 LID
area and one area for each SCM)
3. Stormwater Wetlands Page:
> Line 27 — It is noted that the majority of the shallow water zone is graded to be 6" (and not 9") below the
permanent pool surface elevation, but the shallow water zone extends to 9" below the permanent pool
surface elevation. Please revise this value to reflect this.
McAdams Response: Supplement Line 27 has been revised to 271.25 to match plans and calculations.
> Line 28 — The provided calculations (Page 39 of the Stormwater Impact Analysis) show the bottom of the
forebay deep pool to be at elevation 268.67' whereas the plans and Supplement-EZ form show an elevation
of 268.9'. Please revise as needed. It is noted that 268.67' is 40" below the permanent pool elevation, but if
the forebay deep pool is only 37" deep at its deepest point, the information in the calculations should reflect
this (Stormwater Wetland MDC 6 requires the depth of the forebay to be between 24" and 40", it does not
require the deep pool to go all the way down to 40" deep).
McAdams Response: Supplement Line 28 has been revised to 268.67 to match plans and calculations.
> Line 30 — The provided calculations (Page 39 of the Stormwater Impact Analysis) show the bottom of the
non-forebay deep pool at elevation 268.67' whereas the plans and Supplement-EZ form show an elevation
of 269.0'. Please revise as needed.
McAdams Response: Plan Sheet C9.02 and SIA Pg 39 have been revised to Elev. 269.0 and depth of 36" as
indicated on the supplement.
> Line 42 — It is noted that the majority of the shallow water zone is graded to be 6" (and not 9") below the
permanent pool surface elevation, but the shallow water zone extends to 9" below the permanent pool
surface elevation. Please revise this value to reflect this.
McAdams Response: Line 42 revised to 9". Line 43 revised to 40" to match plan.
> Lines 47 & 48 — The drawdown mechanism for the temporary pool is the drawdown orifice, not the weir (the
provided weir draws down volume in excess of the temporary ponding surface and is not used to draw down
the temporary pool). These items are not required. Please revise.
McAdams Response: 12" notation removed from Line 48.
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RESPONSE TO COMMENTS > 2021110321
> Line 50 — Please answer this item (since Line 51 indicates that a soil amendment specification has been
provided).
McAdams Response: ^" entered for Line 50 as indication on the plan.
4. Please provide the following:
> 1x original signed & notarized hard copy & 1x electronic copy of the deed restriction document
> 1x hard copy & 1x electronic copy of the revised Supplement-EZ Form pages.
> 1x hard copy & 1x electronic copy of the revised pages of the calculations (as needed).
> 1x hard copy (2x hard copies for plan sheets) & 1x electronic copy of any other items needed to address these
comments.
McAdams Response: Requested items will be provided
Consideration of this response is greatly appreciated. If you should have any questions or require additional
information, please do not hesitate to contact me at 919. 361. 5000.
Sincerely,
MCADAMS
David L Smith, PE
Sr. Technical Manager, National Brands
DS/md
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