SW1220701_Email_20230329

Peck, Kaitlin
From:Farkas, Jim J
Sent:Wednesday, March 29, 2023 9:46 AM
To:[e-mail]; Tommy Karnes
Cc:[e-mail]
Subject:RE: SW1220701 All About Plumbing Building Addition
Please upload the electronic files associated with the 2/28/2023 resubmission to the following address:
https://edocs.deq.nc.gov/Forms/SW-Supplemental-Upload

The hard copies were reviewed and addressed the outstanding comments, however, we cannot issue the permit until
the electronic files are uploaded.

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

From: Farkas, Jim J
Sent: Thursday, February 23, 2023 3:50 PM
To: [e-mail]
Cc: [e-mail]
Subject: RE: SW1220701 All About Plumbing Building Addition

Mr. McCutchen,

I was looking over the additional information you provided on November 29, 2022. Everything looks good except for a
few small issues:

Please correct the following:
- Swale Design:
o The provided actual 10-year design storm velocities for the vegetated conveyances do not appear to be
correct. The provided calculations show this velocity value as being determined based on the 10-year
design flow (4.48 cfs for swale #1) and the available cross-sectional area of the swale (9.75 sf, derived
from a trapezoidal cross-section with bottom width of 2’, side slopes of 3:1, and a depth of 1.5’). This
velocity, 0.46 fps, is significantly less than what would actually occur as a flow rate of 4.48 cfs would
produce a much shallower for this swale (which would have a smaller cross-sectional area and,
therefore, a higher velocity). Instead of assuming that the swale will flow full (depth = 1.5’) Manning’s
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equation should be iteratively solved for depth of flow based on the design flowrate (4.48 cfs). Using the
provided swale geometry, a design flow of 4.48 cfs, and a Manning’s n value of 0.15 would result in an
actual velocity closer to 1.36 fps (A = 3.287 sf, Wp = 6.840’, depth = 0.767’). Please revise as needed.
o The provided Manning’s n value (0.15) appears to be on the high side (we typically expect n values in the
0.03-0.04 range for grass lined channels (https://deq.nc.gov/media/8717/download)). Please either
provide a source for the n values used in this calculation or revise the calculation.
- Application, Section IV, 10:
o I apologize in advance for the seemingly contradictory comments that I will be making for this section.
High-density and low-density projects get handled differently in this section of the Application and the
prior comments were under the assumption that the project was a high-density project (also, this form
predates the latest version of the rules so there are some inconsistencies/confusion about how to fill
out the table).
o For a low-density project, the “drainage area” for the project is equal to the project area (see
information is Section IV, 9 of the Application). Please revise the values in the table as follows:
 Total & On-site Drainage Area – This value should equal the project area (3.15 ac per the plans),
expressed in square feet.
 Proposed Impervious Area – This should equal the net increase in BUA (0.33 ac per the plans),
expressed in square feet.
 % Impervious Area – This value should correspond to the value in Section IV, 8.
 On-site Buildings/Lots – This should equal the net increase in building roof area (0.15 ac per the
plans), expressed in square feet.
 On-site Parking – This should equal the net increase in gravel parking area (0.18 ac per the
plans), expressed in square feet.
 Existing BUA – This should be equal to the total amount of existing BUA (1.00 ac per the plans),
expressed in square feet.
 Total – This should be the sum of the items in the lower half of the table and should equal the
total amount of BUA that will exist in proposed conditions (1.33 ac per the plans), expressed in
square feet.
- Supplement-EZ Form:
o Cover Page:
 Line 7 – This item refers to the width of the vegetated setback from surface waters (which is 30
ft in this part of the State). Please revise. It is noted that there are no surface waters located in
the project area, we just ask that this value be included on the form.
o Drainage Areas Page:
 Line 4 – Similar to the Application, this project only has 1 “drainage area” which is equal to the
entire project area.
 Entire Site Column:
 Line 10 – This item is the sum of the items of Line 12 and should equal the net increase
in BUA (0.33 ac per the plans), expressed in square feet.
 Line 12, Parking – This should equal the net increase in gravel parking area (0.18 ac per
the plans), expressed in square feet.
 Line 12, Roof – This should equal the net increase in building roof area (0.15 ac per the
plans), expressed in square feet.
 Line 15 – This should be equal to the total amount of existing BUA (1.00 ac per the
plans), expressed in square feet. NOTE: BUA that is relocated within a project area or
changed from one type to another is still considered to be existing BUA that will remain
and does not need to be treated.
 Line 18 – This value should correspond to the value in Section IV, 8.
 LD1 Column – This column will be identical to the entire site column.
o Low-Density Page:
 Line 5, Vactual, and Flow Depth – Please revise as needed.
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 Vallowable – This is the maximum allowable velocity of runoff in the vegetated conveyances
before it starts eroding. Maximum permissible velocities can be found in Part C-11 of the
Manual (https://deq.nc.gov/media/17545/download) or from another acceptable source.

Please provide the following:
- 1x hard copy & 1x electronic copy of the revised calculations.
- 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 (2x hard copies for plan sheets) & 1x electronic copy of any other items needed to address these
comments.

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

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

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 review.

Let me know if you have any questions.

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

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From: Farkas, Jim J
Sent: Tuesday, October 18, 2022 4:26 PM
To: [e-mail]; [e-mail]
Cc: Aiken, Stan E <[e-mail]>
Subject: RE: SW1220701 All About Plumbing Building Addition

Good Afternoon,
The Division of Energy, Mineral and Land Resources (DEMLR), received additional information for a Stormwater
st
Management Permit Application for the subject project on July 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]

From: Tran, Kieu M <[e-mail]>
Sent: Thursday, August 4, 2022 9:06 AM
To: [e-mail]; [e-mail]
Cc: Farkas, Jim J <[e-mail]>; Aiken, Stan E <[e-mail]>
Subject: SW1220701 All About Plumbing Building Addition

Good morning,

We received your post-construction stormwater permit for the above mentioned project on 7/21/2022. 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
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“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 #: SW1220701

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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