SW3230608_Email_20240222 (2)

Peck, Kaitlin
From: Farkas, Jim J
Sent: Thursday, February 22, 2024 10:54 AM
To: Sean Mayo
Cc: [e-mail]; svc_post_construction_stormwater
Subject: RE: [External] RE: SW3230608; Stoneglen Subdivision (Rowan)
Sand Filter MDC 2—"The sand filter shall include a sediment chamber and a sand chamber. Storage volume in each
chamber shall be equivalent."
Your statement that, "We could have a range from 0%-50%of the treatment volume in sediment basin but not more
than 50%. For example, if we did not want to design to have any attenuation of peak flows, we would not have a
sediment chamber at all. This would be 0%and certainly meet requirements."is incorrect as it violates the MDC (since
the MDC requires the inclusion of a sediment chamber and equivalent storage volumes in each chamber). In order for
the sand filter to not be undersized, at least half of the minimum required treatment volume must be provided in each
chamber(the chambers would have equivalent volume and the total provided treatment volume would be at least as
large as the minimum required treatment volume).
The guidance provided in the Manual indicates that you can oversize the sediment chamber if you wish, but it does not
say that you can then undersize the sand chamber to compensate for that. It also does not say that you can oversize the
sand chamber(in relation to the sediment chamber) as the MDC still needs to be met.
Following the steps under Sand Filter MDC 3:
1) Calculate design volume-> 14,536 cf
2) Multiply design volume by 0.75-> 10,902 cf
3) Divide the discount volume by the ponding depth to get a minimum surface area of the sand filter-> 10,902 cf/
(768.45 ft—767.2 ft) =8,721.6 sf NOTE:This is for the entire sand filter, not just the sand chamber. NOTE:This is
a conservative approach as it does not take into account the actual storage provided by the SCM.
4) In order for Sand Filter MDC 2 to be met, the sand chamber and the sediment chamber would need to have half
of the minimum surface area of the sand filter(calculated above) and would result in half of the design volume
being provided in each chamber. As noted above, only the sediment chamber can be oversized (it must store at
least 50%of the minimum required treatment volume). NOTE: If you are not taking the conservative approach
and actually calculating the storage volumes provided via a stage-storage table, only the volumes provided in
each chamber(and not necessarily the surface areas) need to be compared.
-Jim
From: Sean Mayo<[e-mail]>
Sent:Thursday, February 22, 2024 10:05 AM
To: Farkas,Jim J <[e-mail]>
Cc: [e-mail]; svc_post_construction_stormwater<[e-mail]>
Subject: [External] RE: SW3230608; Stoneglen Subdivision (Rowan)
CAUTION: External email. Do not click links or open attachments unless verified. Report suspicious emails with the Report Message
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Jim,
1

A quick call may help clarify this for me if my explanation does not make sense below. If you do have a minute, I can be
reached at 704.724.5047.
surface area of the sand filter.
4. If the sand filter is designed to attenuate peak flows,additional surface area may be
added in the sediment chamber only.The sand filter must be designed so that 50%of
the treatment volume can be stored in the sand chamber below the first bypass device.
The screenshot above is from the manual. My understanding/interpretation of that sentence is that a "minimum" of
50%of the treatment volume is stored in the sand chamber below the first bypass. (I have added the word "minimum')
My understanding is that the intent of that requirement is that this ensures regulates the size of the sand filter and that
it is of adequate size. We have 57%and meet the requirements.
Your comment notes that "at least half of the minimum required treatment volume is provided in each chamber". I
don't think that it is correct to say that we are required to have a minimum of 50% in the sediment chamber.We could
have a range from 0%-50%of the treatment volume in sediment basin but not more than 50%.
For example, if we did not want to design to have any attenuation of peak flows,we would not have a sediment
chamber at all.This would be 0%and certainly meet requirements. If we just needed to provide minor attenuation,we
could add some additional sediment chamber volume but I don't think that obligates us to oversize the sediment
chamber to be more than 50%.
Thanks
Sean Mayo, Emm
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From: Farkas,Jim J <[e-mail]>
Sent:Thursday, February 22, 2024 9:33 AM
To: Sean Mayo<[e-mail]>
Cc: [e-mail]; svc_post_construction_stormwater<[e-mail]>
Subject: RE: SW3230608; Stoneglen Subdivision (Rowan)
Sean,
I was looking over the additional information you provided on February 13, 2024. Everything looks good except for a few
small issues:
Please correct the following:
• Sand Filter MDC 2—Per the revised stage-storage table,the storage volume provided in each chamber does not
appear to be equivalent(Vsand_chamber=6,838 cf&Vsed._chamber=5,038 cf). Please revise as needed.
NOTE:The sediment chamber may be oversized to provide detention so long as at least half of the minimum
required treatment volume (half of 10,902 cf= 5,451 cf) is provided in each chamber(below the invert of the
bypass device).
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Please provide the following:
• 1x hard copy & 1x electronic copy of the revised page of the Supplement-EZ Form.
• 1x hard copy & 1x electronic copy of the revised page(s) of the calculations.
• 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 Fed Ex/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.deg.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.The quickness of the next review for this project is dependent on reviewer
availability.
Let me know if you have any questions.
Thanks,
Jim Farkas
State Stormwater Engineer
North Carolina Department of Environmental Quality
Office: [phone]
[e-mail]— E
NCH I H CAHOLINA 74M Q
ki ;
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
3

From: Farkas,Jim J
Sent:Wednesday,January 10, 2024 10:38 AM
To: [e-mail]
Cc: [e-mail]; svc_post_construction_stormwater<[e-mail]>
Subject: RE: SW3230608; Stoneglen Subdivision (Rowan)
Sean,
I was looking over the additional information you provided on October 20, 2023. Everything looks good except for a few
small issues:
Please correct the following:
• Prior Comment 7.c.iii (Stage-storage table)—Please ensure that the stage-storage table reflects the actual SCM
geometry. For example,the cross-sectional area for the sand chamber is shown to be constant whereas in
actuality, it increases as the elevation increases (the attached screenshot shows the approximate extents of the
cross-sectional area of the sand chamber at elevation 768.0' and is larger than the cross-sectional area of the
sand filter surface area of 4,732 sf). Please revise the stage-storage table and correct Lines 23 &30(and any
other lines as needed) of the Sand Filter Page of the Supplement-EZ Form. Please also note that the highlighted
row of the stage-storage table shows the elevation as 768.42'whereas the invert of the bypass device is shown
at elevation 768.45' per the plans. Please revise.
• Supplement-EZ Form, Drainage Areas Page, Line 20—The design volume of the SCM is the storage volume
provided in the SCM above the bottom of the SCM (in this case, at elevation 767.2') and below the invert of the
lowest bypass invert(in this case, at elevation 768.45').This value will be equal to the sum of lines 23 &30 of
the Sand Filter Page
• NOTE: Since the lowest point of the sand filter is located less than 2 feet above the SHWT elevation, special
language will be added to the permit for this project to ensure that the underdrain system does not drain the
water table (essentially the language will add a monitoring requirement to check the underdrain outlets for flow
during dry periods and to fix it if it becomes an issue).
Please provide the following:
• 1x hard copy & 1x electronic copy of the revised page of the Supplement-EZ Form.
• 1x hard copy & 1x electronic copy of the revised page(s) of the calculations.
• 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 Fed Ex/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.
4

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.deg.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.The quickness of the next review for this project is dependent on reviewer
availability.
Let me know if you have any questions.
Thanks,
Jim Farkas
State Stormwater Engineer
North Carolina Department of Environmental Quality
Office: [phone]
[e-mail]
NCH I H CAHOLINA
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
From: svc_post_construction_stormwater
Sent:Tuesday, October 3, 2023 3:50 PM
To: [e-mail]; [e-mail]
Cc: Eplin,Jerry W<[e-mail]>
Subject: RE: SW3230608; Stoneglen Subdivision (Rowan)
Good Afternoon,
The Division of Energy, Mineral and Land Resources (DEMLR), received additional information for a Stormwater
Management Permit Application for the subject project on July 6, 2023 and September 25, 2023. 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.
Thanks,
Jim Farkas
Post-Construction Stormwater Permitting Group
North Carolina Department of Environmental Quality
[e-mail]
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NCH I H CAHOLINA 74M Q
D_ E
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
From: Peck, Kaitlin <[e-mail]>
Sent:Thursday,July 6, 2023 3:22 PM
To: [e-mail]; [e-mail]
Cc: Farkas,Jim J <[e-mail]>; Eplin,Jerry W<[e-mail]>
Subject: SW3230608; Stoneglen Subdivision (Rowan)
This email is to correct the subject header for DEQ tracking purposes. Please see previous email for project review
updates.
Take care,
Kaitlin Peck
Environmental Specialist
North Carolina Department of Environmental Quality
Office: [phone]
[e-mail]
D 0
cl ;
NUH I H CAHOLINA 74M Q
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
From: Peck, Kaitlin
Sent:Thursday,July 6, 2023 3:20 PM
To: '[e-mail]' <[e-mail]>; '[e-mail]' <[e-mail]>
Cc: Farkas,Jim J <[e-mail]>; Eplin,Jerry W<[e-mail]>
Subject: RE: Stoneglen Subdivision; Granite Quarry, Rowan County
Good Afternoon,
We received your post-construction stormwater permit application for the subject project 7/6/23. Reviews under the
Standard permitting process can take up to 90 calendar days to complete. You can see where this project stands in the
review queue by emailing Jim Farkas (He has an autoreply set up that has the review queue on it). 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.
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https://edocs.deg.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. YOU MUST CLICK ON THE"ADD ANOTHER POST-
CONSTRUCTION FILE UPLOAD"TO ADD ADDITIONAL FILE TYPES TO THE SUBMISSION. Merely changing the file type
dropdown as you upload the various files (without adding additional file uploads)will upload all of the files as the last
file type selected,the submission will get flagged during review, and you will need to resubmit the files. 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. NOTE:We do not require and we discourage the upload/submission of extraneous plan
sheets (such as lighting plans, utility plans, striping plans, sight distance plans, etc...) as these files are not needed for
review.
Please type in permit#: SW3230608
This project will be reviewed by Jim Farkas, if you have any questions, please contact them at [e-mail] or
at 919-707-3646.
Thank you,
Kaitlin Peck
Environmental Specialist
North Carolina Department of Environmental Quality
Office: [phone]
[e-mail]
D_ E
NCH I H CAHOLINA 74M Q
ti ;
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
From: Peck, Kaitlin
Sent: Friday,June 9, 2023 2:14 PM
To: [e-mail]
Cc: Farkas,Jim J <[e-mail]>; Eplin,Jerry W<[e-mail]>
Subject: Stoneglen Subdivision; Granite Quarry, Rowan County
Good Morning,
We received your application for a new post-construction stormwater permit on 5/31/23. At this time, the submission is
not administratively complete and cannot be accepted for review in its current condition. Please provide the following

submittal items within 30 calendar days (by close of business on 7/9/23) so that we may accept the project and begin
the review process, otherwise, the project will be returned as administratively incomplete.
• 2x hard copies of the Application with the following corrections made (These items are required per 15A NCAC
02H .1042(2)(a) and per Section VI, 1 of the Application):
• Section III, 1b—The contact information for the applicant is incomplete. Please revise as needed.This
contact information is required per 15A NCAC 02H .1042(2)(a)(vii).
• Section III, 2b—The contact information for the property owner is incomplete. Please revise as needed.
This contact information is required per 15A NCAC 02H .1042(2)(a)(vii).
• Section IV, 8—The percent impervious area for the project area does not appear to be calculated
correctly. Project density calculation information can be found in 15A NCAC 02H .1003(1). Please note
that"existing BUA" refers to BUA that was in-place prior to the rules going into effect in this area, not
just what BUA happens to currently be on the site. Please revise and provide a calculation in the
calculation booklet showing how the percent BUA for the site is calculated.
• Section IV, 10—Please show the total drainage area in square feet instead of acres.
• Section IV, 10—Please use the information for the first named surface water("Crane Creek", "C", "12-
115-(2)for the receiving stream name, classification and index number. NOTE:There seemed to be a
typo in your original submittal.
• 1x hard copy of the complete, original Supplement-EZ Form (This item is required per Sections V&VI, 3 of the
Application).This form can be found on our website at the following
address: https://deg.nc.gov/about/divisions/energy-mineral-and-land-resources/stormwater/stormwater-
program/stormwater-design. Please note that a complete Supplement-EZ form will have 3 or more pages and
uses macros to generate the relevant sheets based on the information entered into the cover page.
• 2x signed &sealed hard copies of a plan sheet showing the following corrected additions:
• Existing site conditions.This item is required per Section VI, 8k&8n of the Application and 15A NCAC
02H .1042(2)(g)(v).
• Details of roads, sidewalks, drainage features, piped collection systems, and the proposed stormwater
controls.This item is required per Section VI 81 of the application.
NOTE:This is an administrative completeness review, not a detailed engineering review, there may be other issues that
may be brough up during the engineering review.
If these items are received within the stipulated timeframe, we can accept the project and begin the review process.
Once accepted, reviews under the standard permitting process can take up to 90 calendar days per statute (one of our
two reviewer positions is currently vacant).
Hard copies should be mailed to the following address:
For Fed Ex/UPS:
8

Jim Farkas
512 N. Salisbury Street, Office 640E
Raleigh, NC 27604
For USPS:
Jim Farkas
1612 Mail Service Center
Raleigh, NC 27699-1612
If you have any questions, please contact Kaitlin Peck at [e-mail] or at(919) 707-9209.
Thank you,
Kaitlin Peck
Environmental Specialist
North Carolina Department of Environmental Quality
Office: [phone]
[e-mail]
D E
NORTH CAROLINA -
Department of Environmental Quality
Email correspondence to and from this address is subject to the North
Carolina Public Records Law and may be disclosed to third parties.
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized
state official.
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