20070173 Ver 2_R-5769 Conceptual Stormwater Mangement Plan_20160204

Burdette, Jennifer a
From: Coggins, Tony C
Sent: Thursday, February 04, 2016 1:22 PM
To: Burdette, Jennifer a; [e-mail]
Cc: Johnson, Wendi O
Subject: FW: R-5769 Stormwater Mangement Plan
Attachments: R-5769 STORMWATER MANAGEMENT PLAN.pdf
Jennifer,
Here is a preliminary narrative of proposed SMP for Gordon Access Road.
Chad Coggins
Environmental Officer
Division 4, NC Department of Transportation
252 296-3532 office
252 717-8699 mobile
tccogginsCq,ncdot.gov
509 Ward Blvd.
PO Box 3165
Wilson, NC 2789:1
Email corre,sponYence to anY from this :Y:Yrs,s,s is ,suMbit to the
lVoill? Carolina Public ReconYs Law anY n7ay be :ttscloss:t to thinY padis,s.
From: Greg Purvis[mailto:[e-mail]]
Sent: Thursday, February 04, 2016 1:06 PM
To: Coggins, Tony C; Page, Jerry P
Subject: FW: R-5769 Stormwater Mangement Plan
Greg S. Purvis, PE
Project Manager
1223 Jones Franklin Rd.
Raleigh, NC 27606
Office: [phone]
Fax: [phone]
Direct: ( 4) 242-0573
www.wetherilleng.com

WE HAVE MOVED
Please update your records with our new address.
1223 Jones Franklin Road, Raleigh, NC 27606-3312
Raleigh
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From: Kevin Alford
Sent: Thursday, February 04, 2016 1:05 PM
To: Greg Purvis
Cc: Max Price
Subject: R-5769 Stormwater Mangernent Plan
Greg,
As requested by Chad, attached is a hand written style stormwater management plan. Let me know if this works for Chad
or if he needs any changes. Thanks.
Kevin B. Alford, PE
1223 Jones Franklin Rd.
Raleigh, NC 27606
Office: (9 19) 851-8077
Mobile: [phone]
Fax: [phone]
Direct: [phone]
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Please update your records with our new address
and forward to your accounting/billing
departments so we can promptly receive and
respond to your mailings.
1223 Jones Franklin Road, Raleigh, NC 27606-
3312
Raleigh
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STORMWATER MANAGEMENT PLAN
February 4, 2016
Project: R-5769
County: Johnston
ROADWAY DESCRIPTION
The project R-5769 is a proposed access road from SR 1905 (Gordon Road) to the
proposed Novo Nordisk site. A majority of the project is on new location, including a
proposed bridge crossing of Norfolk Southern railroad. The total approximate project
length is 0.64 miles. The project is located within the Neuse River Basin and eventually
flows to Little Poplar Creek. The project will impact the surrounding wetlands located
along the project alignment. The project drainage consists of grass lined ditches, grated
inlets with associated pipe systems and rip rap dissipater pads at the pipe outlets.
ENVIRONMENTAL DESCRIPTION
The project is located within the Neuse River Basin, which buffer regulations have been
implemented. There are no stream crossing on this project, but the project flows to Little
Poplar Creek. Little Poplar Creek is listed on the NCDENR classifications list as a Class
WS -IV, NSW. Little Poplar Creek is not listed on the 303(d) list for impaired streams.
There are wetland sites along the proposed alignment that will be impacted by the
proposed project. Impacts will be minimized by using rip rap dissipater pads at the pipe
outlets and sheet flow along fill slopes. Any discharge to wetland areas will be at non-
erosive velocities.
BEST MANGEMENT PRACTICES AND MAJOR STRUCTURE
The primary goal of Best Management Practices (BMP's) is to prevent degradation of the
states surface waters by location, construction and operation of the highway system. The
BMP's are activities, practices and procedures taken to prevent or reduce stormwater
pollution. The BMP measures used on this project to reduce stormwater impacts are:
• Rip Rap Dissipater Pads
Rip Rap pads dissipater pads will be used in order to dissipate energy and
attain non-erosive velocities at pipe outlets. These structures will be used
at the pipe outlets in the wetlands in lieu of Preformed Scour holes to
prevent excavation in wetlands. Preformed scour holes may be utilized at
non wetland discharge locations.
• Fill Slopes
Fill slopes within the wetlands will allow sheet flow from the proposed
roadway in order to minimize discharge from piped drainage systems.
Also, in high fill areas, such as in the area of the proposed rail crossing,
1.5:1 armored fill slopes will be used in wetlands in order to minimize the
impact of the fill slope to the wetlands.