20051608 Ver 1_Other Agency Comments_20050512

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STATE OF NORTH CAROLINA
DEPARTT~NT OF TRANSPORTATION
MICHAEL F. EASLEY
GOVERNOR
August 8, 2005
United States Army Corps of Engineers
Regulatory Field Office
Post Office Box 1000
Washington, NC 27899-1000 ,
ATTN: Mr. Bill Biddlecome ~ 5 ~ ~ O
NCDOT Coordinator
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LYNDO TIPPETT
SECRETARY
SUBJECT: Planned Geotechnical Investigations for Bridge No. 60 over the Trent River on US 70
Business; Craven County; TIP Project B-2532; Federal Aid Project No. BRSTP-
070B(4); State Project No.8.1172401.
Dear Mr. Biddlecome,
The North Carolina Department of Transportation (NCDOT) is planning a foundation investigation for
the above referenced project. A consultant will be conducting the investigation with a maximum of 42
borings. Thirty-eight of the borings will be performed within the Trent River and will be drilled through
the deck of the existing bridge or performed from a barge. Four others will be drilled through the
existing roadway embankment. A1142 borings are shown on the attached permit drawings. This project
does not require the completion of a formal PCN but notification to the Corps is being provided to be
included in their database.
Due to the fact that the Trent River supports anadromous fish, notification to the appropriate agencies
through a Nationwide 6 Permit is required. Because this area is located in sensitive waters, an in-water
moratorium exists between February 15 through June 30. All in-stream work will take place outside the
moratorium dates.
In order to build the new bridge over the Trent River, geotechnical test borings will need to be done so
that structure and foundation recommendations can be made. All borings will be drilled utilizing a drill
mounted on a rubber tired drill rigs and a barge. The size of the borings are approximately 0.5 feet in
diameter. The area that may be disturbed per boring is estimated to be approximately 4 square feet for
the river borings and 8 square feet for the land borings. Total area disturbed will be 184 square feet. The
consultant will use casings to advance the borings and rotary-wash techniques while recirculating the
drilling fluids between the mud tub and the inside of the casing. This will isolate the drilling mud and
cuttings and contain them in the boring and the mud tub. The borings will be backfilled with the cuttings
and then sealed with a bentonite hold plug. The excess drilling mud will be disposed of in upland areas.
MAILING ADDRESS:
NC DEPARTMENT OF TRANSPORTATION
PROJECT DEVELOPMENT AND ENVIRONMENTAL ANALYSIS
1548 MAIL SERVICE CENTER
RALEIGH NC 27699-1548
TELEPHONE: [phone]
FAX: [phone]
Wees~re: www.ncdot.org
LOCATION:
TRANSPORTATION BUILDING
1 SOUTH WILMINGTON STREET
RALEIGH NC