20100752_R-2237C Modification_20161007

Carpenter,Kristi
From:Smarshallcpa <[e-mail]>
Sent:Friday, October 07, 2016 1:59 PM
To:Wanucha, Dave
Subject:Re: R-2237C Modification
Thank you Dave.

Sent from my iPhone

On Oct 6, 2016, at 1:54 PM, Wanucha, Dave <[e-mail]> wrote:
Hi Shannon,
The links below will provide you with some information regarding stormwater and water quality
standards. DOT’s Stormwater Best Management Practices (BMP) Toolbox (in the last link below) is a
good engineering resource.

I have asked Marla Chambers with NC Wildlife Commission (NCWRC) to contact you regarding your
concerns as well. NCWRC is one of the agencies involved with the 404/401 program. She may be able
to provide another prospective relative to trout waters.

In the meantime, I’ve contacted Marc to obtain more details relative to the extent of stormwater
treatment we can expect from a riprap dissipater pad. Let me know if you need anything further.

http://www.ncstormwater.org/
http://deq.nc.gov/about/divisions/water-resources/planning/classification-standards/classifications
https://www.ncdot.gov/programs/environment/stormwater/npdes_permit/

Dave W.

Dave Wanucha

Division of Water Resources

Transportation Permitting Unit

NC Department of Environmental Quality

336-776-9703 office

336-403-5655 mobile

[e-mail]

NC DEQ Winston Salem Regional Office

450 West Hanes Mill Road, Suite 300

Winston Salem, NC 27105

<image001.png>

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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From: Smarshallcpa \[mailto:[e-mail]\]
Sent: Wednesday, October 05, 2016 11:59 AM
To: Wanucha, Dave <[e-mail]>
Cc: Shown, Marc T <[e-mail]>; Bailey's Camp Partners <[e-mail]>;
Amy Marshall <[e-mail]>; Bill Little <[e-mail]>; Jody Little
<[e-mail]>; [e-mail]
Subject: Re: R-2237C Modification

Dave:

Thank you for the work, communication and the information. I will need to get this info to someone
who can independently understand and advise me on the engineering assumptions and interpretation
of flow data.

Is there anything that you can offer relative to water quality of what will be introduced to the trout
waters?

Thank you,

Shannon

Sent from my iPhone

On Oct 5, 2016, at 10:32 AM, Wanucha, Dave <[e-mail]> wrote:
Hi Shannon,
I talked with Marc Shown this morning, the DOT hydrologist that designed the
stormwater drainage system for the permit modification. See the emails below. He
confirmed that stormwater discharged from the proposed pipe would be a small
fraction (~3%) of the overall stormflow that would drain to Bailey’s Creek upstream of
your ponds.

Attached for your review are the data Marc provided during my field meeting on Sept
7. Marc will be happy to talk with you concerning the data. His phone number is 919-
707-6751. Let me know if you need anything further. Thanks.

Dave W.

Dave Wanucha

Division of Water Resources

Transportation Permitting Unit

NC Department of Environmental Quality

336-776-9703 office

336-403-5655 mobile

[e-mail]

NC DEQ Winston Salem Regional Office
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450 West Hanes Mill Road, Suite 300

Winston Salem, NC 27105

<image005.png>

Email correspondence to and from this address is subject to the

North Carolina Public Records Law and may be disclosed to third parties.

From: Shown, Marc T
Sent: Wednesday, October 05, 2016 9:56 AM
To: Barrett, William A <[e-mail]>
Cc: Wanucha, Dave <[e-mail]>
Subject: RE: R-2237C Modification

Dave,

You are looking at it correctly. The reason that the discharge from the pipe looks large
compared to the overall drainage area is due to the methods used to calculate the
discharges. Rational method was used to calculate the discharge for the pipe and Rural
regression equations were used to calculate the discharge for the overall drainage
area. The rational method was used for the pipe as it is conservative and keeps our
pipes out of pressure flow situations and accounts for the faster runoff due to
impervious area and channelization. The rural equations look at the entire basin and
the time of concentration for the basin will be larger than that for the pipe therefore
reducing the peak discharge. Let me know if you need anything further, My # is 919-
707-6751.

Marc

From: Barrett, William A
Sent: Monday, October 03, 2016 10:51 AM
To: Shown, Marc T <[e-mail]>
Cc: Wanucha, Dave <[e-mail]>
Subject: FW: R-2237C Modification

Marc,

I received the email below from Dave Wanucha with DWR. Can you provide a response
to his question?

Thanks
Bill

From: Wanucha, Dave
Sent: Monday, October 03, 2016 10:47 AM
To: Barrett, William A

Subject: R-2237C Modification

Hi Bill,
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I’m reviewing the data you provided while in the field Sept 7 (see attached) and need to
clarify drainage areas in regards to the Bill’s Lane outfall (Site XIV).

Your data estimate that the entire drainage area to Bailey’s Creek upstream of the
outlet at 204 acres, and the Q10 based on USGS regression would be 125 cfs. The
proposed 24” outlet will drain just 6.7 acres (roughly 3.0%) of that total, and the Q10 for
the proposed 24” outlet is estimated at 21 cfs. Am I interpreting that correctly?

Dave W.

Dave Wanucha

Division of Water Resources

Transportation Permitting Unit

NC Department of Environmental Quality

336-776-9703 office

336-403-5655 mobile

[e-mail]

NC DEQ Winston Salem Regional Office

450 West Hanes Mill Road, Suite 300

Winston Salem, NC 27105

<image006.png>

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 sender is subject to the N.C. Public Records Law and may be disclosed to third

parties.
<Outfall data.pdf>

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