SW3190505_RESPONSE TO COMMENTS_1/7/2020

ROY COOPER
Governor
MICHAEL S. REGAN
Secretory
S. DANIEL SMITH
Director
Vince G. Keene, PE
PO Box 1198
Pineville, NC 28134
NORTH CAROLINA
Environmental Quality
RESPONSE TO COMMENTS
December 2, 2019
Subject: Request for Additional Information
Stormwater Permit No. SW3190505
Courtyards on Lawyers Road
Union County
Dear Mr. Keene:
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on November 1, 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. Original Comment # 3 —In light of the provided information/response to original
comment 93, please provide documentation showing that Bob Kardos is affiliated with
EPCON LR2, LLC. Certificate of Incumbency provided with this submittal authorizing Bob Kardos to act on
behalf of EPCON LR2, LLC for the Courtyards on Lawyers Road project.
2. Original Comment 911 — Please provide the following hard copies (Signed in August) of
the files uploaded to Laserfiche:
a. Ix — Stormwater Permit Application with original signatures. Revised application provided.
b. Ix — Deed Restriction with original signature. Revised deed restriction provided.
c. Ix — O&M Agreement with original signature (Please ensure that the temporary
pool elevation, clean out depth, sediment removal elevation, and bottom elevation
correspond to lines 25, 34, 21, and 20 of the Supplement-EZ Form respectively. Revised O&M
Agreement provided as requested.
Please also provide a hard copy of the Supplement-EZ Form with original signature,
corrected per the below comments. Revised Supplement-EZ Form provided as requested.
Based on the provided plans sheets, the proposed wet ponds appear to meet the MDCs,
however, the provided calculations in the stormwater management report do not match
the information shown on the plans. There are also some instances where the information
on the plans/calculations does not match the Supplement-EZ Form. Please correct the
following:
.OX
QI'll
�North Carolina Department of Environmental Quality I Division of Energy. Mineral and Land Resources
5I2 North Salisbury Street 1 1612 Mail Service Center I Raleigh. North Carolina 27699-1612
o�+nm�i 0 �­W' ar14 919.707.9200

a. Stormwater Management Calculations
i. The stage -storage information in Step 3 of the wet pond calculations does
not match the detail sheets. This permanent pool stage -storage table
should not include the forebay area, only the main pool. Stage-storage
ets and cl tilesde match detail pool.
ii. The stage -storage information in Step 6 of the wet pond calculations does
not match the detail sheets. Stag e-storage information matches detail sheets.
iii. The stage -storage information in Step 7 of the wet pond 92 calculation
does not match the detail sheet. Stag e-sto rage information matches detail sheet.
iv. For the design storm, the water quality volume in each wet pond will be
able to flow out of both the primary and secondary orifices. Please take
this into account when calculatingthe drawdown time for the wet ponds.
WQV calculations provided in this sumittal illustrating that WQV peak elevations for each pond
are below the secondary orifices of those ponds and the water quality volume should only be
b. Supplement-EZ Form flowing through the primary orifice.
i. Please include the Drainage Area Sheet. The "Entire Site" column should
include everything within the project area (i.e. no off -site areas) and the
drainage area columns should include everything draining to wet ponds 1
and 2. Drainage Area Sheet provided as requested.
ii. Line 25 — The temporary pool elevation should be the elevation of the
water quality volume (Difference between the pre -development and post -
development runoff for the 1-year storm) when stored in the permeant
pool. Based on the provided stage -storage tables, the values shown on line
25 appear to be too high. Temporary pool elevation has been revised to match WQV elevation.
iii. Line 27, Wet Pond #1— The stage -storage table from the detail sheet does
not produce the volume shown on line 27d Calculations have been revised and Supplement-
'EZ f rm been re sed to show correct volume.
iv. Line 34 — The cleanout depth for the forebay s�iou e the difference
between the permanent pool elevation and the top of the sediment storage
elevation. Cleanout depths have been revised as requested.
v. Line 37 — The orifice diameter should be the diameter of the primary
orifice (As shown on the wet pond detail sheets and calculated in step 9 of
the stormwater management calculations), not the size of the pipe
connecting to the riser structure. Orifice diameters have been revised as requested.
4. Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, and 1 hardcopy of other
documents. Pdfs must be uploaded using the form at:
https://edocs.deq.nc.gov/Forms/SW Project Submittal
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 January 1, 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 SW3190505 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
Jim.Farkaskncdenr. og_v or [phone].
Sincerely,
Jim Farkas
Environmental Engineer
Stormwater Program
cc: Mooresville Regional Office