SW5240603_Design Calculations_20240911 (5)

From: D'Arconte,Trish <[e-mail]>
Sent: Thursday,August 8, 2024 10:38 AM
To: Ross, David; Chandler, Rebecca D
Cc: Tracy, Sierra
Subject: RE: [External] Re: DEQ Contact SNAP Questions
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Hey David,
Here's an idea: since a large portion is undeveloped,you could split it into two equal areas, one
that is completely undeveloped (and preferably expected to stay so) and the other has the
developed portions. With it being so large there's almost no way even the developed portion will
exceed any Nutrient Management Strategy nutrient export target(Falls, Neuse, etc.), but yes it
needs to be documented.
I would set this up as two SNAP runs/files, both with the same area for ease of doing the latter part
of calculation,which will be by hand.
1. Exclude the parts of the project/parcel that could be classified as "Existing development"—
those were built/installed before the local nutrient ordinance came into effect
2. Split what's left into two equal portions, but keep all development on one of them (mostly
to make error checking easier)
3. Run each as a separate SNAP project
4. On the Nutrient Export Summary sheet(upper part)you'll see the Total Nitrogen (and
Phosphorus if applicable) Export Target Scaled to Project Area, it's in lb/yr—get that value
for both the projects and add them together to get the export target load for the whole
>lsqmi site
5. Also on the Nutrient Export Summary sheet(lower part)you'll see the more detailed
results. Look for the Total Nitrogen Load Leaving Site (lb/yr) (row)for the Project Area Post-
Project after Treatment(column)—these TN and TP load cells have heavy outlines to make
it easy to see them (use this column even if you have no SCMs,this is just for consistency
with other projects that do have SCMs)
6. Add together the resulting TN (and TP if appropriate) loads from step#5 to get your total
N/P Load leaving the composite site.
7. If Total Load <Target Load then you're good to go!
Let me know how it goes, especially if you have any problems with it.
Trish
From: Ross, David <[e-mail]>
Sent: Wednesday,August 7, 2024 6:54 PM
To: D'Arconte,Trish <[e-mail]>; Chandler, Rebecca D
<[e-mail]>

Cc:Tracy, Sierra <[e-mail]>
Subject: RE: [External] Re: DEQ Contact SNAP Questions
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Yes,this is one of the largest parcels I have worked on. It is a state owned property with a large
portion being undeveloped. We are proposing a small addition to one existing facility on the site.
It is in Wake County at the Eaddy building.
Would it be helpful to have a call to discuss?
Thanks,
David A. Ross, PE
Project Manager
2610 Wycliff Road, Suite 410
Raleigh, NC 27607-3073
D 984.232.6788
kit Dewberry.
in L] O
www.dewberry.com
From: D'Arconte,Trish <[e-mail]>
Sent: Wednesday,August 7, 2024 12:34 PM
To: Ross, David <[e-mail]>; Chandler, Rebecca D<[e-mail]>
Cc:Tracy, Sierra <[e-mail]>
Subject: RE: [External] Re: DEQ Contact SNAP Questions
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Hey David,
Wow, larger than 1 square mile. Is the whole thing to be developed? Is it a cluster development,
where we could split the calculation between the undeveloped area and developed? Is it phased
4 then you could calculate for separate phases?
Trish
From: Ross, David <[e-mail]>
Sent: Wednesday, August 7, 2024 8:21 AM
To: D'Arconte,Trish <[e-mail]>; Chandler, Rebecca D

<[e-mail]>
Cc:Tracy, Sierra <[e-mail]>
Subject: RE: [External] Re: DEQ Contact SNAP Questions
ISome people who received this message don't often get email from [e-mail]. Learn why this is important
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Good morning Trish/Rebecca,
Did either of you have a chance to review the request below?
We are looking to provide guidance to our client on how we should proceed.
Thanks,
David A. Ross, PE
Project Manager
2610 Wycliff Road, Suite 410
Raleigh, NC 27607-3073
D 984.232.6788
kit Dewberry.
in L] O
www.dewberry.com
From: Ross, David
Sent: Friday,August 2, 2024 1:55 PM
To:[e-mail]; [e-mail]
Cc:Tracy, Sierra <[e-mail]>
Subject: FW: [External] Re: DEQ Contact SNAP Questions
Trish/Rebecca,
Jack Lowry sent me your information to help on the question below:
We have a project located in the Nuese River Basin. The Parcel is state owned and would fall into
the Low Density Category. Due to the Nuese River regulations,we need to account for the Nitrogen
and Phosphorus leaving the site. We typically would use the SNAP tool; however,the parcel is
larger than 1 square mile and make the simple method N/A.
Do you have a spreadsheet for a parcel this size, or could you point us to the correct calculation
method to account for this large of an area?
Thanks,
David A. Ross, PE
Project Manager
2610 Wycliff Road, Suite 410

Raleigh, NC 27607-3073
D 984.232.6788
Dewberry.
in ® 0
www.dewberry.com
From: Lawry-Popelka,Jack<[e-mail]>
Sent: Friday,August 2, 2024 1:44 PM
To: Ross, David <[e-mail]>
Cc:Tracy, Sierra <[e-mail]>
Subject: RE: [External] Re: DEQ Contact
For this type of question, I would contact Trish D'Arconte ([e-mail]) as she
typically fields questions regarding SNAP. Additionally, a WSRO contact in the water quality
(whose purview this falls under)would be Rebecca Chandler([e-mail]).
Jack Lawry-Popelka
Engineer II
336-776-9659
Land Quality Section, Winston-Salem Regional Office
Division of Energy, Mineral, and Land Resources
North Carolina Department of Environmental Quality
450 West Hanes Mill Road, Suite 300
Winston-Salem, NC 27105-7407
E QNORTH 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.
From: Ross, David <[e-mail]>
Sent: Friday, August 2, 2024 11:52 AM

To: Lawry-Popelka,Jack<[e-mail]>
Cc:Tracy, Sierra <[e-mail]>
Subject: [External] Re: DEQ Contact
IYou don't often get email from [e-mail]. Learn why this is important
CAUTION: External email. Do not click links or open attachments unless verified. Report suspicious emails with the
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Jack,
I appreciate the call! We have a project located in the Nuese River Basin. The Parcel is state
owned and would fall into the Low Density Category. Due to the Nuese River regulations,we need
to account for the Nitrogen and Phosporous leaving the site. We typically would use the SNAP tool;
however,the parcel is larger than 1 square mile and make the simple method N/A.
Do you have a spreadsheet for a parcel this size, or could you point us to the correct calculation
method to account for this large of an area?
Thank you in advance!
David A. Ross,PE
Project Manager
2610 Wycliff Road,Suite 410
Raleigh, NC 27607-3073
D 984.232.6788
Dewberry•
in V g 0
www.dewberry.com
From: Moffitt,Jason A<[e-mail]>
Sent: Friday,August 2, 2024 11:40 AM
To: Ross, David <[e-mail]>
Subject: DEQ Contact