SW3210301_Add Info_20210419

ROY COOPER
Governor
DIONNE DELLFGATTI
Secretary
BRIAN WRENN
Director
Matthew S. Kiker, PE
1020 Euclid Avenue
Charlotte, NC 28203
NORTH CAROLINA
Environmental Quality
April 19, 2021
Subject: Request for Additional Information
Stormwater Permit No. SW3210301
Cresswind — Phase 2
Union County
Dear Mr. Kiker:
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on March 10, 2021. A review of that
information has determined that the application is not complete. The following information is
needed to continue the stormwater review:
1. It appears as though the Applicant, KH Wesley Chapel, LLC, is also the Property Owner.
If this is the case, please change Section III, lc of the Application to indicate that the
Applicant is the Property Owner (not the Developer).
2. Please do one of the following:
a. Please provide official documentation from KH Wesley Chapel, LLC indicating
that the Applicant, Mike McLendon, is able to sign on behalf of KH Wesley
Chapel, LLC (Section VI, 11). As discussed in an earlier email, since the
Secretary of State documentation does not list a company official by name you
will have to provide some other form of official documentation. If Mike
McLendon can sign on behalf of KH Wesley Chapel, LLC then the Property
Owner Authorization (Section IX) is not required and should be revised in the
Application.
b. Please clarify the Applicant/Property Owner relationship and provide official
documentation for both the Property Owner, Robert A. Rademacher, and
Applicant, Mike McLendon.
3. Please show the drainage area to the proposed wet pond based on the current phase being
permitted (Phase 2). You are allowed to oversize this wet pond with the specific intent to
treat BUA that will be built at some future time (We can even put specific language in the
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 OAROLINA _
Depar ntofEnvlmnmmdlDoellry 919.707.9200

permit stating the maximum drainage area size and impervious area that the wet pond can
handle in the future), however what is currently being permitted must meet all of the
applicable requirements as a standalone project (Phase 2 should still be able to meet all of
the treatment requirements if, theoretically, Phase 3 never gets built). What you are
asking to have permitted (A wet pond that treats all of the impervious area from Phase 2
and some of the impervious area from Phase 3) is not what is being constructed per the
submitted plans (An oversized wet pond that treats some of the impervious area from
Phase 2 and a diversion ditch that diverts part of the wet pond's future drainage area
around it). For clarity, you may want to show the "Phase 2" drainage area to the wet pond
and the "Phase 3" drainage area to the wet pond in the Application (Section IV, 10) and
in the Supplement-EZ Form (Or you can just oversize the wet pond now, state your
intentions to use this oversized wet pond to treat some future BUA, and provide the
future drainage area/sizing calculations when Phase 3 gets submitted for approval). Let
me know if you would like to set up a meeting to discuss this further.
NOTE: The following comments are based on what was provided in this submission,
they may or may not be applicable to the resubmission.
4. The proposed impervious area information (Section IV, 10) does not appear to be correct.
The sum of all of the individual types of BUA (1,224,710) does not add up to the shown
total BUA (1,319,710 sf). Based on the provided deed restriction document, the BUA
associated with lots appears to be too large or account for lots not included in this phase
of construction.
5. Please provide calculations showing that all outlets are stable during the 10-year storm
(Section VI, 7).
6. The main pool is too small (Wet Pond MDC lb). The SA/DA tables relate the surface
area of the main pool (not the entire wet pond) to the drainage area. Per the provided
calculations, the minimum surface area of the main pool of the wet pond is 40,968 sf
whereas only 38,860 sf are provided. NOTE: Table values should be interpolated based
on the actual average depth of the main pool and actual percent impervious of the
drainage area.
7. The stage -storage table for forebay 2 appears to be incorrect. The cross -sectional area at
elevation 564 is smaller than the cross -sectional area at elevation 563.
8. The 4 ft wide weir at elevation 566.8 is located below the temporary ponding elevation
(approximately at elevation 566.99 per the provided stage -storage table (which is
different than the provided water quality elevation calculation)) and should be accounted
for in the drawdown equation (or, preferably, moved above the temporary ponding
elevation).
9. The following issues were noted with the Supplement-EZ Form:
a. Drainage Area Page:

i. Entire Site Column — This column should be an accounting of all of the
BUA located within the project area. This column would include and BUA
that is located outside of the drainage area to the SCM (Line 5 of this
column should show the entire site area since the entire site doesn't have a
"drainage area").
ii. Line 10 — These items should add up to Line 7 (since Line 10 is a
breakdown by type of the impervious area shown on Line 7), but it does
not.
b. Wet Pond Page:
i. Line 25 — This value (565.51) differs from the water quality elevation
calculation (565.71) and the value interpolated from the provided stage -
storage table (approximately 566.99). This value should be based on the
design volume.
ii. Line 28 — This value (2.89) appears to be calculated incorrectly (Average
depth calculation is only for the main pool) in the calculations and must be
greater than 3.0 ft per Wet Pond MDC 2.
10. Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, and 1 hardcopy of other
documents.
a. Pdfs must be uploaded using the form at:
https:Hedocs.deq.nc.gov/Forms/SW—Project Submittal
b. Hard copies must be mailed or delivered to the following address:
Jim Farkas
512 N. Salisbury Street
1612 Mail Service Center
Raleigh, NC 27699-1612
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 May 19, 2021, 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 SW3210301 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,
Jim Farkas
Environmental Engineer
Stormwater Program
cc: Mooresville Regional Office