SW6210204_2021-03-31 NCDEQ Comment Responses_20210422

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Project: NCNG Raeford MOV & POV Expansion Date: 04/22/2021
State ISW6210204
Contact: Frank Slinsky, PE
Phone: [phone]
Email: [e-mail]
Comments from NCDEQ review has been addressed below. Our responses are in red.
Construction Document Submittal First Submittal Comments — 3/31/2021
NCDEQ REVIEW COMMENTS
Jim Farkas (919-707-3646, flm.far as ine�ieinir® v)
Per NCDOT (https://www.ncdot.gov/divisions/aviation/Pages/nc-airports.aspx), this project
is not located within 5 miles of a public airport (Section II, 5 of the Application). Please
either provide the name of the airport that is located within 5 miles of this project or revise
the Application.
Response: There is a private airport within 5 miles of the project, but there is not a public
airport within 5 miles. Section II, 5 of the application has been revised accordingly. The
updated application is attached.
2. Please provide the original, signed copy of the Application (Section VI, 1). If it is not
possible to provide the original, signed copy of the Application (Due to the ongoing Covid
pandemic) we will accept the provided signed electronic copy.
Response: Many people at NCNG have been working remotely due to Covid, so it is not
possible to provide the original signed copy of the Application. The electronic copy is
attached.
3. Please provide the original, signed copy of the O&M Agreement Form (Section VI, 3). If it
is not possible to provide the original, signed copy of the O&M Agreement Form we will
accept the provided signed electronic copy.
Response: Many people at NCNG have been working remotely due to Covid, so it is not
possible to provide the original signed copy of the O&M Agreement form. The electronic
copy is attached.
4. Please provide a signed & sealed hard copy of the design calculations (Sectioon VI, 7).
Response: The signed & sealed design calculations are attached.
5. Please sign the plans.
Response: The signed plans are attached.
6. Per General MDC #1 (15A NCAC 02H .1050(1)), the SCM must be sized to take into
account the runoff at build out from all surfaces draining to the system. The way the SCM
is currently set up, the entire drainage area to the SCM is not accounted for (Part of it is
bypassed in the flow splitter/control weir). You will either need to increase the design
volume that can be held in the SCM (You can leave the device in the "off-line"
configuration) or reduce the size of the drainage area to the SCM. Revise as needed. If
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you would like more specific comments on what should be changed, please let me know
how this issue will be corrected.
Response: Previously, the BUA going to the SCM was 1.68 ac, but it was only sized for
1.59 ac. A roof drain on the lower left portion of the building has been re-routed to bypass
the SCM. This reduces the BUA going to the SCM to 1.59 as it was designed for. The
updated plans and calculations are attached. Feel free to reach out if any further
explanation is needed.
7. Please correct the following issues with the Supplement-EZ Form, Storm Filter Page:
a. Line 3 — This is a requirement (see earlier comment)
b. Line 33 — There appears to be a flow -splitting device used.
Response: Line 3 has been updated to "yes" as the SCM is now sized to treat
stormwater from all surfaces within its drainage area. Line 33 has been updated to "yes"
the updated Supplement-EZ Form is attached.
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