20190205 Ver 1_More Info Received_20190306 (2)

Johnson, Alan
From: Arrance, Keven <[e-mail]>
Sent: Wednesday, March 06, 2019 8:46 AM
To: Johnson, Alan; [e-mail]
Subject: [External] RE: Diane street sewer
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Alan,
The culverts for the Diane Street project cannot be shortened due to existing topography, access requirements, and the
need to provide for protection of the proposed sewer pipe from being exposed by future down -cutting of the
stream. Existing topography and access requirements result in the width of the access road and fill slopes being 30
feet. The access road needs to be open to maintenance and repair vehicles at all times. Therefore, the access road is
sited adjacent to the sewer pipe, with the toe of the fill slope being approximately 6 to 8 feet off the pipe
centerline. The offset is needed to allow for future maintenance work or emergency repairs that may be needed on the
sewer line. The culverts are proposed to be extended just beyond the sewer pipe in order to provide protection against
the pipe being exposed in the future due to down -cutting of the stream if left as a daylighted channel at the sewer
crossing. Extending the pipe from the upstream toe of fill slope to just downstream of the sewer alignment results in a
40 -foot long culvert.
The pipes will be installed in a mickey mouse concept with the vertical offsets you describe below.
Please let me know if you have any additional or follow-up questions or would like to discuss the culverts further.
Thanks, and have a great day!
Ms. Keven Arrance
Senior Principal Scientist I Hazen and Sawyer
4011 WestChase Blvd., Suite 500, Raleigh, NC 27607
919 863-9350 (direct); 919 522-4269 (mobile)
karrance(@hazenandsawyer.com I hazenandsawyer.com
From: Johnson, Alan <[e-mail]>
Sent: Friday, March 1, 2019 1:50 PM
To: [e-mail]; Arrance, Keven <[e-mail]>
Subject: Diane street sewer
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I noted that the plans call for a 40 ft culvert. Given that this is a sewer line, wouldn't a shorter culvert suffice? 20 or 25
ft culvert?
I assume the pipes are installed in a mickey mouse concept, with a base flow culvert and the additional culverts perched
for storm flow?
Thanks
Alan Johnson

DWR
DhA-don of Water ResourCc%
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]
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