20130655 Ver 1_More Info Received_20130730

Homewood, Sue
From:Greg Hoffman [[e-mail]]
Sent:Tuesday, July 30, 2013 11:21 AM
To:Homewood, Sue
Cc:Dave Richmond
Subject:Kernersville Greenway
Attachments:Temp Stream Bypass Detail.pdf
Sue,

Thank you for your preliminary comments regarding the submittal for the Town of Kernersville’s Greenway project. Dave
Richmond asked that I respond to the e-mail you sent him. I’ve responded to each of your comments in red text below.

Please feel free to call or e-mail me with additional comments or questions.

Sincerely,

Greg Hoffman , PE, CPESC
Senior Project Engineer

McGill Associates, P.A.
1240 19th Street Lane, NW | Hickory, NC 28601
Phone: [phone] | Fax: [phone]
Email: [e-mail] | Website: www.mcgillengineers.com

From: Dave Richmond
Sent: Tuesday, July 30, 2013 7:47 AM
To: Greg Hoffman
Subject: FW: kernersville greenway

David E. Richmond, PE
Senior Project Manager

McGill Associates, P.A.
th
1240 19 Street Lane NW
Hickory, North Carolina 28601
828-328-2024 / fax: [phone]

“Building Partnerships by Providing Superior Service with Professional Integrity”

From: Homewood, Sue [mailto:[e-mail]]
Sent: Monday, July 22, 2013 4:35 PM
To: Dave Richmond
Cc: 'Thomas, John T JR SAW'
Subject: kernersville greenway

Dave,
1

In reviewing the PCN for this project I have some questions/clarifications:

The PCN notes that there has been no known jurisdictional determination for the area. I see that your plans


show the streams as they shown on the USGS map but the topo map also shows areas that have potential to
be jurisdictional streams, and with the greenway being so close to Kerner’s Mill Creek there could be wetlands
in some of the low areas. I am particularly wondering about any locations you show needing to put in
culverts. Has there been any field verification of the channels/swales that are along the greenway?
These channels/ swales are drainage features. They are mostly channels that convey runoff from upstream areas, such

as parking lots and other developments.
There is an area on Sheet C-112 and Sheet C-113 where the toe of fill for the greenway looks as if it is right on


the top of the stream bank. If this is an accurate depiction, is there adequate room for construction and
erosion control without disturbance to the stream bank? Also, you call out riprap on the embankment below
the pedestrian bridge but don’t account for those impacts in the PCN. Has the USACE verified that the riprap
protecting the bridge does not need to be quantified in the permit?
In this area, the toe of slope will be 5’-10’ from the top of stream. We believe this is adequate room for installation of
silt fence without impacting the stream. After the silt fence is installed, the contractor will not be permitted on the
opposite side except for repairs. The rip rap below the pedestrian bridge won’t be located within the stream bank. The
channel here is deeply incised and according to the flood maps, the 100-year event will not over top the banks. The rip
rap will stop at an elevation well above the 100-year flood event and will be offset approximately 40 feet from the top of

bank.
The 401 General Certification requires that streams be dewatered prior to working in them. This typically
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involves some temporary impacts added onto the permanent impacts for proper dewatering upstream and
downstream of the culvert. I did not see this called out on the PCN table of impacts or the plans, or see a
detail for dewatering.

Attached is a detail for dewatering that will be added to the plans.
The application says this is going to be a low density project, has the Town verified that this project meets


Phase II under their jurisdiction? Some local governments chose not to review their own projects and in that
case DWQ will have to make the determination. I just want to be clear in my file what entity is making the
final call. Also, since this is a Water Supply classification, the Water Supply regulations state that greenways
are allowed provided there are no practical alternatives, they direct water away from the stream and they use
BMPs as practical. Has the Town verified that this project meets these requirements. I know it’s their project
and it makes sense that they would review this, but some local governments do not review their own projects
so I’ve learned to get confirmation for my file.

The location of the greenway has been determined by the Town because no practical alternative location exists.

Thanks,

2

Sue Homewood

NC DENR Winston-Salem Regional Office

Division of Water Quality

585 Waughtown Street

Winston-Salem, NC 27107

Voice: [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.

3

TEMPORARY STREAM BYPASS DETAIL