20081111 Ver 1_More Info Received_20081009

LC
08- 1111
Date: October 8, 2008
To: Ian McMillan
Division of Water Quality
401/ Wetlands Unit
1650 Mail Service Center
Raleigh, NC 27699
From: Michael B. Westcott, PE
Westcott, Small & Associates, PLLC
4015 Meeting Way
Suite 105 1
High Point, NC 27265 D ? MOW
I
We are sending you ® attached E] under separate cover the following items:
? Shop Drawings ? Estimate ? Disk
® Prints ? Specifications ® Other
? Contracts ? Copy of Letter
0 C I 9 2008
DENR - WATER OI JAL11 ?
WETLANDS MID STORMWATEP BRANG8
COPIES DRAWING NO DESCRIPTION DISPOSITION
1 Robinhood Manor Letter to Sue For your use
Homewood for certification
application.
1 Impact Map For your use
1 Stream Crossing For your use
REMARKS:
cc: File
4015 Meeting Way, Suite 105 9 High Point, North Carolina 27265 0 phone: [phone] • fax: [phone]
fi
ASmall
September 29, 2008
Sue Homewood
North Carolina Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
Re: Section 401 Water Quality Certification application
Dear Ms. Homewood:
On July 15, 2008 the North Carolina Division of Water Quality (DWQ) received our application for a
401 General Water Quality Certification to impact 145 linear feet to construct a road crossing and a
temporary crossing for the Robinhood Manor Apartment Complex near Winston-Salem in Forsyth
County. Additional information was requested in order to process our application. The additional
information requested is as follows.
Please provide a more detailed profile view and cross section of the proposed stream culverts.
Please also submit detailed drawings indicating pipe burial. For the permanent crossing, the
Division will require that the natural streambed be routed through only one of the proposed
culverts and the other culvert be constructed as a flood plain pipe and installed at bankfull
elevation or a sill provided on the pipe inlet. Flood plain benches shall be installed at both ends
of the pipe to establish natural channel dimensions above and below the crossing. This
information must all be clearly detailed on the plans and resubmitted to the Division for
approval.
New sheets have been created for each stream crossing showing plan and profiles for the existing
and proposed condition. The culvert has been changed to a box section due to sanitary sewer
constraints which limit raising the 54" pipe that was previously proposed.
2. Please note that the due to the length of time the temporary crossing will be installed, the
temporary pipe will require proper burial into the stream bed to allow for aquatic life passage.
The temporary crossing is shown with proper burial on its sheet mentioned in the response to #1.
4015 Meeting Way, Suite 105 9 High Point, North Carolina 27265 • phone: [phone] • fax: [phone]
3. A site visit conducted on August 11, 2008 noted a large bedrock grade control structure in the
stream at approximately the location of the culvert inlet. Please clarify how this structure will be
addressed during installation of the culverts. Please also note that although the Division typically
requires culvert burial, we prefer to avoid blasting into bedrock in or directly below the
streambed for the purposed of pipe burial. You should identify the locations of all bedrock within
the area of the culvert installation.
The rock outcropping will be constructed over. This is indicated on the plan for this crossing.
4. The site visit also noted a sharp turn within the stream channel directly downstream of the
culvert outlet. Additional impacts may eventually be necessary to address the shear stress upon
this streambank. The permit issued to you will require a preconstruction meeting, as well as a
final approval after installation. Additional stabilization work may be necessary at those times.
You may address this situation now if you choose to avoid possible future repairs and permit
modifications.
The construction sequence indicates a pre- and post- construction meeting with the engineer and
NCDENR.
5. Per the requirements of GC 3705, please enumerate all temporary impacts (in addition to
permanent impacts already indicated) to the stream channel and any wetland areas. Impacts from
the construction of a floodplain bench would be considered temporary impacts. Temporary
impacts also include areas of disturbance necessary for proper pipe installation, as well as any
impacts from temporary erosion control measures expected to be installed within any
jurisdictional areas. Please note that temporary impacts should be minimized to the maximum
extent practical.
Attached is a revised copy of the pertinent PCN sheet showing the verified impacts as well as an
impact map showing the areas in question.
6. Per the requirements of GC 3705, all work be done "in the dry". Therefore, dewatering methods
will be necessary to temporarily dewater the stream channel during pipe installation. Please
provide a construction sequence that details the method of dewatering to be utilized at the site
and the sequence of construction events to be followed to ensure compliance with this condition.
The plan & profile sheets for each crossing show diversions necessary to reroute the stream flows
during construction.
7. Per the requirements of GC 3705, this project must comply with Stormwater Management Plan
(SMP) Requirements for Applicants Other Than the North Carolina Department of
Transportation, available at:
http://h2o. enr. state.nc.us/ncwetlands/documents/SMPReguiremtnstforApplicanstotherthanNCDO
T2.pdf. It appears that this project will be subject to another state implemented program. Please
verify that you have, or intend to, submit a stormwater management plan under that program.
Plans for the site BMPs have been sent for permitting.
If you have any questions, comments or concerns please give our office a call at 336-812-3546.
Designing to Meet Your Needs,
WESTCOTT SMALL & ASSOCIATES, PLLC

Michael Westcott, PE
Principal
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t ~ ~ - - I I I ~ I i I I l ( ~ I
Y I I ~ I I I I ' I I ? ( I NOTES: _ i _ , - - I ~ .
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La i i DWG. BY: DF
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