SW6220501_Email_20220727

Farkas, Jim J
From:Farkas, Jim J
Sent:Wednesday, July 27, 2022 2:57 PM
To:[e-mail]
Cc:[e-mail]
Subject:RE: SW6220501 Southview Park Subdivision
Scott,

I was looking over the additional information you provided on May 5, 2022. Everything looks good except for a few small
issues:

Please correct the following and revise as needed:
- Application:
o Section IV, 10, Drainage Area 1 Column:
 Please include the off-site BUA (14,609 sf) on the “Off-site” line.
 Please also recalculate the “Total”, “Proposed Impervious Area”, and “% Impervious Area”
values based on the prior comment.
- Supplement-EZ Form:
o Drainage Areas Page:
 General:
 Line 20 – The design volume of the SCM should match Line 35 of the Wet Pond Page.
 There are some issues with the BUA accounting on this page. I tried to outline the issues
in the below comments, but it may not be 100% clear. If it is not clear, please let me
know and we can discuss further.
 Entire Site Column:
 Lines 7 & 11 – Off-site components are not required for the entire site column.
 Line 8 – The sum of the DA columns for Line 8 does not equal the entire site column
value for Line 8 and it should (58,332 sf + 48,359 sf = 106,691 sf ≠ 103,688 sf).
 Line 9 – This value may need to be revised per later comment.
 Line 10 – This value may need to be revised per later comment.
 Line 12, Parking – This value may need to be revised per later comment.
 Lines 19 – 21 – These items are not required for the entire site column.
 DA 1 Column:
 Line 8 – Please include the off-site BUA (Line 11) for this item. It is noted that off-site
BUA is not located within the project, however, for this column this Line refers to the
total amount of BUA within the drainage area to the SCM (72,941 sf) and should
therefore include the off-site BUA.
 DA 2 Column:
 Line 8 – The sum of Lines 9 & 10 does not equal Line 8 and it should (23,790 sf + 24,566
sf = 48,356 sf ≠ 48,359 sf).
 Line 9 – This value (23,790 sf) does not match the On-site Buildings/Lots value from
Section IV, 10 of the Application (23,793 sf).
 Line 10 – The sum of the Line 12 Items does not equal Line 10 and it should (5,845 sf +
2,673 sf + 16,036 sf = 24,554 sf ≠ 24,566 sf).
 Line 12, Parking – This value (5,845 sf) does not match the On-site Parking value from
Section IV, 10 of the Application (5,857 sf).
o Wet Pond Page:
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 Line 2 – The minimum required design volume is based on the design storm and should
correspond to the value shown in the calculations of 5,942 cf (5,644 cf provided).
 Line 25 – The temporary pool elevation must be sufficient to provide at least as much storage as
the minimum required treatment volume (Line 2). The provided temporary pool surface
elevation, 203.06’, corresponds to a storage volume of about 4,600 cf (interpolated from the
provided stage-storage table (4,280 cf of storage is provided @ elevation 203.0’)) which is less
than the minimum required design volume (5,942 cf). For convenience, you may wish to set the
temporary pool elevation equal to the invert of the bypass weir (203.36’). This should provide
sufficient storage.
 Line 26 – Per the provided stage-storage table, the provided surface area of the main pool at the
permanent pool elevation (202.5’) is 6,312 sf (6,257 sf shown).
 Line 35 – The design volume of the wet pond should be based off of the amount of storage
provided between the permanent pool surface elevation and the temporary pool elevation (Line
25).
 Line 37/55 – Per the plans (C-6.2), the orifice diameter is 1.7” (1.6” shown).
o Low-Density Page:
 Line 5 – The maximum velocity in the vegetated conveyances is shown in the calculations as 2.45
fps (Ditch 3)
 Line 15 – You may wish to add a note stating that only Ditches 1-3 are curb outlet swales
(subject to 15A NCAC 02H .1003(2)(d)) and Swales 4-6 are vegetated conveyances (subject to
15A NCAC 02H .1003(2)(c))
- Calculations:
o Please provide the Manning’s “n” values used for the swale/ditch calculations, they did not appear to be
included in the calculations (I back-calculated these values and they looked reasonable, I just want to
make sure that these are the same values that you used).
o The Ditch 3 calculation shows a longitudinal slope of negative 0.82%.
- Other:
o Ditch 2 (a curb outlet swale) is shown in the calculations as having cross-slopes of 2:1. Per 15A NCAC
02H .1003(2)(d)(iv), the maximum allowable cross-slope is 3:1.
o Ditches 2 & 3 (curb outlet swales) are shown in the calculations as having bottom widths of 1’. Per 15A
NCAC 02H .1003(2)(d)(iii), the minimum allowable bottom width is 2’.
o There appears to be an error with the provided electronic version of the riprap calculations for PO 17
(see attached). The issue was not present on the provided hard copy so I was able to review it.

Please provide the following:
- 1x hard copy & 1x electronic copy of the revised pages of the Application.
- 1x hard copy & 1x electronic copy of the revised pages of the Supplement-EZ Form.
- 1x hard copy & 1x electronic copy of the revised pages of the calculations.
- 2x hard copies & 1x electronic copy of the revised plan sheets (if needed).

Hard copies should be mailed to me at the following address:
For FedEx/UPS:
Jim Farkas
512 N. Salisbury Street, Office 640E
Raleigh, NC 27604

For USPS:
Jim Farkas
1612 Mail Service Center
Raleigh, NC 27699-1612

Hand Delivery:
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Please reach out to me prior to hand delivering a submission to make sure that I (or someone else in my group)
will be able to receive the submission. Do not leave the package in the foyer with the security guard.

NOTE: Hard copies should not be sent to a Regional Office. Doing so will delay the review process and the
submission package may be lost while being sent from the Regional Office to me in the Central Office.

Electronic copies should be uploaded at the following location:
https://edocs.deq.nc.gov/Forms/SW-Supplemental-Upload

Since these are really minor things, once I get the hard copies, anything else that may have changed from addressing
these issues, and the documents are uploaded to Laserfiche (Provided everything is still in order), we can issue the
permit without doing another formal 30-45 day review.

Let me know if you have any questions.

Jim Farkas
Environmental Engineer
North Carolina Department of Environmental Quality
Division of Energy, Mineral, & Land Resources – Stormwater Program

512 N. Salisbury Street
1612 Mail Service Center
Raleigh, NC 27699-1612

[phone]
[e-mail]

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

Based on the current guidance to minimize the spread of COVID-19, the Department of Environmental Quality has
adjusted operations to protect the health and safety of the staff and public. Many employees are working remotely or
are on staggered shifts. To accommodate these staffing changes, all DEQ office locations are limiting public access to
appointments only. Please check with the appropriate staff before visiting our offices, as we may be able to handle your
requests by phone or email. We appreciate your patience as we continue to serve the public during this challenging
time.

From: Tran, Kieu M <[e-mail]>
Sent: Monday, May 9, 2022 2:21 PM
To: [e-mail]; [e-mail]
Cc: Farkas, Jim J <[e-mail]>; Lawyer, Mike <[e-mail]>
Subject: SW6220501 Southview Park Subdivision

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Good afternoon,

We received your post-construction stormwater permit application for the above mentioned project on 5/5/2022.
Reviews under the standard permitting process generally take 45 calendar days, but can take up to 90 calendar days per
statute (our other reviewer, Corey Anen, no longer works for the State, so this review may exceed 45 days). Please
upload all documents that you mailed into our office through the link provided below. Be sure to choose the Central
Office as the Primary Contact office.

https://edocs.deq.nc.gov/Forms/SW-Supplemental-Upload

IMPORTANT NOTE: Please ensure that each file is uploaded under its appropriate file type. Additional file types can be
entered into the electronic form by clicking on the “Add Another Post-Construction File Upload” link directly below the
“State Stormwater Information Uploads” section of the form. Please do not upload entire plan sets through this form,
but rather upload the relevant individual sheets under the appropriate file type. Selecting the correct file type ensures
that the files are properly named in the electronic repository and it helps expedite the review process.

Please type in permit #: SW6220501

If you have any questions, please contact Jim Farkas [e-mail] 919-707-3646.

Thank you,

Mrs. Kieu Tran
Stormwater Program Administrative Assistant
Office: (919) 707- 3640
[e-mail]

North Carolina Department of Environmental Quality
Division of Energy, Mineral, and Land Resources Stormwater Program

512 N. Salisbury Street, Raleigh, NC 27604 (location)
1612 Mail Service Center, Raleigh, NC 27699-1612 (mailing)
Website: http://deq.nc.gov/about/divisions/energy-mineral-land-resources/stormwater

Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed
to third parties

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