20161159 Ver 1_Email_20161208

Strickland, Bev
From:Buchholz, George <[e-mail]>
Sent:Thursday, December 08, 2016 8:34 AM
To:Larsen, Cory; Johnson, Alan
Cc:Higgins, Karen; Aldridge, Jon; Malcolm, David; Clark, Amos; Jason Randolph
([e-mail]); Loperfido, JV
Subject:RE: Union Athletic Club; Pre-Construction Notification –NWP 14 and GC 3886; USACE
#SAW-2016-00076
Alan and Cory,

Sorry for the delay in a follow up response to you.

McAdams will be revising the site plan and road crossing. Stormwater for the site plan and a “mickey mouse”
installation design for the 3 culverts at the road crossing will be revised. We anticipate having the revision completed by
January 6, 2017. I will send you the revised exhibits and revised PCN quantity numbers once I receive them. It is
anticipated that based on the “mickey mouse” installation design, stream impacts will be reduced; however, a final
determination is dependent upon the flood analysis.

If you have any questions or want to discuss this further, please contact me at the numbers and/or email below.

George Buchholz, REM, PWS | Environmental Consultant
2905 Meridian Parkway | Durham, NC 27713
Office: 919.361.5000 x 288
Direct: 919.287.0890
Mobile: [phone]
[e-mail]

Designing Tomorrow's Infrastructure & Communities

From: Buchholz, George
Sent: Wednesday, November 30, 2016 3:26 PM
To: 'Larsen, Cory' <[e-mail]>; Johnson, Alan <[e-mail]>
Cc: Higgins, Karen <[e-mail]>
Subject: RE: Union Athletic Club

Thanks for the comments Cory and Alan,

McAdams will be discussing this internally probably early next week.

George Buchholz, REM, PWS | Environmental Consultant
2905 Meridian Parkway | Durham, NC 27713
Office: 919.361.5000 x 288
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Direct: 919.287.0890
Mobile: [phone]
[e-mail]

Designing Tomorrow's Infrastructure & Communities

From: Larsen, Cory \[mailto:[e-mail]\]
Sent: Wednesday, November 30, 2016 3:17 PM
To: Johnson, Alan <[e-mail]>; Buchholz, George <[e-mail]>
Cc: Higgins, Karen <[e-mail]>
Subject: RE: Union Athletic Club

Alan you’re right. The project doesn’t really meet the intent of a typical low-density development in a number of ways,
primarily with the concentration of impervious areas next to surface waters rather than uplands and failure to utilize
vegetated conveyances throughout with 3:1 side slopes. Direct piping of the offsite drainage to the stream bank is also a
problem – it should be conveyed with a swale. I would want to have some treatment for runoff from the building and
parking areas even if it is 23.9% BUA (which I have no way to verify without more information).

Cory Larsen, PE
Stormwater Engineer
401 & Buffer Permitting Branch
NCDEQ – Division of Water Resources

919.807.6379 office
[e-mail]

1617 Mail Service Center
Raleigh, North Carolina 27699-1617

Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.

From: Johnson, Alan
Sent: Wednesday, November 30, 2016 1:40 PM
To: '[e-mail]' <[e-mail]>
Cc: Larsen, Cory <[e-mail]>
Subject: Union Athletic Club

Couple of comments:

1)The triple box culvert needs to be modified. Given that the channel is 7 ft wide and you propose three seven (7)

wide culverts side by side, this will over widen the channel (immediately up and down stream). We typically
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suggest a mickey mouse installation, so that base flow can move through a single culvert and storm flow moves
through the additional culverts.
2)It seems that rather than “piping” off site storm water flow, why isn’t that added to the propose grassed

swale? Since there is no treatment volume of concern.
3)The dissipater pad must be constructed so that water flow over the rock upon leaving the culvert and not

through the rip rap. Rip rap is not a DWR requirement, and if the culvert is constructed properly, it may not be
needed (see photo)
4)Not my area of expertise, but it seems that given the concentrated parking, treatment may be

required…..Cory????

Thanks
Alan J

Alan D Johnson – Senior Environmental Specialist
NC Dept. of Environment & Natural Resources (NCDENR)
Division of Water Resources - Water Quality Regional Operations
610 East Center Ave., Suite 301, Mooresville, NC 28115
Phone: [phone] Fax: [phone]

E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties unless the content is exempt by statute or other regulation.

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