SW3220201_Response to Comments_20220412

benesch
April 11, 2022
TO: Jim Farkas
Environmental Engineer
North Carolina Department of Environmental Quality
Division of Energy, Mineral, & Land Resources — Stonrlwater Program
450 W. Hanes Mill Road, Office 640E
Raleigh, NC 27604
RE: Response to Comments Letter — Frank Liske Park Barn
County: Cabarrus
City: Concord
Address: 4001 Stough Road
Submitted By: Alfred Benesch & Company
Mr. Farkas,
Alfred Benesch & Company
2359 Perimeter Pointe Parkway, Suite 350
Charlotte, NC 28208
www.benesch.com
P 704-521-9880
F704-521-8955
The following are the response to your email, regarding the stormwater permit for the Frank Liske Park Barn
Project, received by my office on 4/11/22. These responses to comments include the original request for
information, reply, aid where any revisions that have been made can be found. Please see the following
comments and responses with my replies in BOLD.
• Please adjust the project narrative as discussed in our 4/7/22 meeting to elaborate on the need to include
the area drains on the plaza (sizable area draining onto the plaza and the inability to divert this area due to
the old trees) and to explain that the existing site condition utilized a roof drain collection system that is
being replaced in -kind.
o The project narrative has been revised per our phone conversation on 4/7/22 and is
included in this submittal.
+ Please provide the discharge calculations for FES 6 and the roof drain for the southeast portion of the
bam. It is noted in the project narrative that these discharge velocities are less than 2 fps, but the
calculations were not provided and therefore could not be verified (15A NCAC 02H .
o Discharge calculations for FES #6 and the roof drains (on the east side of the barn) are
included in this submittal as requested.
+ Application:
o Section IV, 8 — The percent impervious area calculation should be done using the project area
(Section IV, 7), not the property area (Section W, 4). NOTE: Since this project has existing BUA,
you can use the project density method outlined in 15A NCAC 02H .1003(1)(b).
■ Section IV, 8 has been revised per your direction.
o Section IV, 10:
■ Total & On -site Drainage Area — These values should correspond to the project area
(Section IV, 7), expressed in square feet.
0 Section IV, 10 has been revised per your direction.

Page 12
■ % Impervious Area — Recalculate (See earlier comment).
% Impervious Area has been revised per your direction.
• Supplement-EZ Form:
o Cover Page:
■ Line 2 — This value should correspond to the project area (Section IV, 7). expressed in
square feet
• Line 2 has been revised per your direction.
o Drainage Area Page:
■ Entire Site Column:
• Lines 5 & 6 — These values should correspond to the project area (Section IV, 7),
expressed in square feet.
• Line 8 — This value should equal to total awnount of BUA that is located within
the project area (Line 9 + Line 10 + Line 1 I + Line 15).
• Line 10 — Please include this item.. 'This item is the sum of all of the BUA listed
in Line 12.
• Line 18 — Revise if needed in accordance with earlier comments.
o The Entire Site Column has been revised to include the above
requirements as you requested
■ LD I Column — Please complete this column, For this project, it will be identical to the
entire site column.
• The Entire Site Column was copied into the LD 1 Column as required.
o Low Density Page:
■ Line 12 — This item is required per 15A NCAC 02H .1003(4)(c).
■ Line 14 — Please answer this item.
■ Line 15 — You may wish to add the explanations that will be added to the narrative
(explaining the need for the area drains and roof drain collection) to this additional
information section.
0 The above questions have been completed as requested.

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• Please provide the following:
o Ix hard copy and Ix electronic copy of the revised project narrative.
o Ix hard copy acid Ix electronic copy of the discharge calculations.
o Ix hard copy and Ix electronic copy of the revised pages of the Application.
o lx hard copy and Ix electronic copy of the revised pages of the Supplement-EZ Form.
■ Hard copies of the above items are being sent overnight to your office and
accompany this response to comments letter. In addition, electronic versions of these
documents will be sent via email for your review and information.
If you have any questions about the above responses to comments, or need any additional information, please feel
free to contact me at your convenience. I can be reached via email at MBlackmonAbencsch.com or by phone at
[phone] (Office) or [phone] (Mobile).
Sincerely,
Matt Blackmon, PE — Project Engineer
Alfred Benesch & Company
CC: Mr, Kyle Bilafer— Cabanus County
Paul Krynski — C Design
Jeff Ashbaugh — Alfred Benesch & Company