SW3221008_email_20230509

Peck, Kaitlin
From:Farkas, Jim J
Sent:Tuesday, May 9, 2023 3:56 PM
To:Greeson, Mason
Cc:[e-mail]; [e-mail];
[e-mail]
Subject:RE: SW3221008 The Estates of Marvin Branch (Formerly SW32108002)
Mason,

I was looking over the additional information you provided on February 10, 2023.

Please correct the following:
- SW3210802 Prior Comment 6 – It is not indicated on the plans that the bottom width of the bypass culvert
channel is 6 ft, a detail is provided for the curb cut swales, but no detail is provided for the bypass culvert
channel. Please revise.
- The provided calculations for the curb outlet swales/vegetated areas appear to be incorrect. Based on the
provided calculations, the cross-sectional side slope used in Manning’s Equation appears to be zero (whereas
the other submittal items indicate 10:1 for CC#5-7 & 3:1 for CC#8-10). For example, from the calculations for
CC#5, the flow area, A, is 1.2 sf, the wetted perimeter, Wp, is 3.2 ft, the depth of flow, h, is 0.6 ft, and the
bottom width, B, is 2.0 ft. Assuming that the cross-sectional area of flow is a trapezoid and solving for side
slopes, Z, results in a side slope of Z = 0 (A = Bh + Zh^2 -> 1.2 sf = 2.0 ft * 0.6 ft + Z * (0.6 ft)^2 -> 1.2 sf = 1.2 sf +
0.36Z sf -> Z = 0) which indicates a vertical side slope (i.e., the channel is modeled as a rectangular channel
instead of a trapezoidal channel). Please revise as needed so that the calculations reflect the actual design
conditions.
- Supplement-EZ Form:
o Low-Density Page:
 CC#6 – The provided flow value (4.69 cfs) does not correspond to the value used in the
calculations (5.65 cfs). Please revise as needed.
 CC#7 – The provided flow value (3.55 cfs) does not correspond to the value calculated based on
the drainage area information (C = 0.5, i = 7.64 in/hr, & A = 1.17 ac -> Q = 4.47 cfs). Please revise
as needed.
 Any other revisions needed to the swale design table due to the earlier comment.

Please provide the following:
- 2x hard copies & 1x electronic copy of the revised plan sheets (as needed).
- 1x hard copy & 1x electronic copy of the revised swale/vegetated area calculations.
- 1x hard copy & 1x electronic copy of the revised pages of the Supplement-EZ Form.

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

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

Let me know if you have any questions.

Jim Farkas
State Stormwater Engineer
North Carolina Department of Environmental Quality
Office: [phone]
[e-mail]

From: Farkas, Jim J
Sent: Thursday, January 19, 2023 4:10 PM
To: [e-mail]; [e-mail]; [e-mail]; Greeson, Mason
<[e-mail]>
Cc: Khan, Zahid <[e-mail]>
Subject: RE: SW3221008 The Estates of Marvin Branch (Formerly SW32108002)

Good Afternoon,
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater Management Permit Application
st
for the subject project on October 21, 2022. A review of that information has determined that the application is not
complete. Attached is a letter describing the items that need to be submitted. If you have any questions, please feel free
to contact me. My contact information is listed below.
Thank you

Jim Farkas
State Stormwater Engineer
North Carolina Department of Environmental Quality
Office: [phone]
[e-mail]
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From: DeBerry, Margie <[e-mail]>
Sent: Friday, October 21, 2022 1:34 PM
To: [e-mail]; [e-mail]; [e-mail]; Greeson, Mason
<[e-mail]>
Cc: Khan, Zahid <[e-mail]>; Farkas, Jim J <[e-mail]>
Subject: SW3221008 The Estates of Marvin Branch

Good afternoon,

We received your post-construction stormwater permit application for the above mentioned project on 10/21/2022.
Reviews under the standard permitting process generally take 75 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 75 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 #: SW3221008

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

Thank you,

Margie DeBerry
Environmental Specialist, Division of Energy, Mineral, and Land Resources
North Carolina Department of Environmental Quality
Office: [phone]
[e-mail]
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