20011689 Ver 1_More Info Received_20030213

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STATE OF NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
MICHAEL F. EASLEY
GOVERNOR
NC DENR/Division of Water Quality,
Wetlands Unit,
1621 Mail Service Center
Raleigh, NC 276994621
ATTN.: John.Dorney, Supervisor
Dear Sir:
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LYNDO TIPPETT
SECRETARY
Subject: Application for Modification to Neuse Buffer Certificate for Site 4 of R-
2547CC. US 64 from I-440 (Raleigh Beltline) to existing US 64 near SR 1003, I-
440 from 0.83 mile south of US 64 to Poole Road and a portion of the East Wake
Expressway from Existing US 64 to the Proposed US 64 Bypass. Wake County.
State Project No 8.1402202. Federal Aid Project No. NHF-DPI-0199 (004). TIP
No. R-2547. WQC Project No. 011689.
The North Carolina Department of Transportation proposes to construct a new
controlled-access six lane, divided highway to be known as the Knightdale Bypass. The new
location of the project consists of the Bypass (R-2547) which would extend from I-440 (Raleigh
Beltline) to existing US 64 near SR 1003, and a portion of the Eastern Wake Expressway (R-
2641) from existing US 64 to the proposed Bypass. The project also includes the widening of I-
440 from 0.83 miles south of US 64 to. Poole Road. On April 10, 2002 your office issued a
Section 401 permit and a certification under the Neuse River Buffer Rules. The project has been
let and construction has begun.
The purpose of this submittal is to request a modification to the Neuse Buffer
Certification to reflect a change in the design of the level spreader that had been proposed at
Station 155+00. There will be no. change to the impacts to the regulated buffers.
It has been determined that the ditch from station 154+60 to, 155+00-L-Rt. is obstructed
by a natural ridge which prohibits the installation of a level spreader that discharged into the
tributary to Mark's Creek at the upstream end of the proposed culvert (Figure 1). Therefore, the
design has been modified by adding two pipes connecting directly into the proposed culvert,
which will collect offsite runoff from 0.9 Ha (2.2 acres) and 1.2 Ha (2.8 acres), respectively
(Figure 2). In addition to the offsite runoff, there will be 0.6 Ha (1.4 acres) onsite runoff, which
will be treated in a 60 m (197 feet) long, 1.5 in (5 feet) base grass swale, as depicted in Figure 2
February 14, 2002
2
and on the corresponding modified permit sheets 8 and 9 of 24. The design of this grassed swale
includes a rock check dam that will function to alleviate the offsite runoff from the 2.2 acre area
from mixing with the on-site runoff and ensure that the grassed swale functions.
MITIGATION
Since there are no change in impacts to buffers there will be no additional mitigation required.
REGULATORY APPROVALS
This modification application contains revised permit application sheets 8 and 9 of 24 as
well as two half size drawings, one depicting a plan view of the site and the second a drawing of
the temporary rock silt check dam. We request that the Buffer Certification issued as Condition
10 of the 401 Water Quality Certification be modified to allow the revised design.
If you have any questions or need additional information please call Ms. Alice N. Gordon
at [phone] or 715-1500.
Sincerely,
?. C'
Gregory J. Thorpe, Ph.D.
Environmental Management Director, PDEA
Cc: Mr. Eric Alsmeyer, USACE, Raleigh Field Office
Mr. Travis Wilson, NCWRC
Mr. Garland Pardue, Ph.D., USFWS
Mr. Jay Bennett, P.E., Roadway Design
Ms. Debbie Barbour, P.E., Highway Design
Mr. David Chang, P.E., Hydraulics
Mr. Mark Staley, Roadside Environmental
Mr. Jon Nance, P.E. (Div. 5), Division Engineer
Mr. Chris Murray (Div. 5), DEO
Mr. David Franklin, USACE, Wilmington (Cover Letter Only)

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