20060690 Ver 4_More Info Received_20081215

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®AVIS-MARTIN-POWELL & ASSOCIATES, INC.
ENGINEERING • LAND PLANNING • SURVEYING
6415 Old Plank Road, High Point, NC 27265
IIIIIIIIIIIIIIIIIP [phone] • Fax [phone] • www.dmp-inc.com
December 12, 2008
Re: City of Trinity, NC
Phase 4A Sewer Extensions - Contract 1
Application for Water Quality Certification
DMP Project E-4096 (BF)
Ms. Sue Homewood kR@R0W1;A n
Division of Water Quality - WSRO iJ
585 Waughtown Street DEC 1 5 2008
Winston-Salem, NC 27107
Dear Ms. Homewood:
DENR., VVAi t fR QU,ALt
WETLANDS AND STORMWATER BRANCH
We have received your comments and have addressed the items on your list as follows:
Comment 1: Condition #12 of General Certification 3699 requires that utility lines cross a stream at
near perpendicular. The crossing shown on Page 16 of the plan sheets, at Station 11 +00 appears
to be in contradiction with this requirement. Please clarity the angle of crossing at this location
and/or clarify if you are requesting an exemption from this permit condition. Exemptions from permit
conditions must be clearly justified.
Response to Comment. The sewer line near station 11 +00 has been shifted such that the
crossing angle is within fifteen degrees of perpendicular, as shown on revised sheet 16
which is enclosed.
Comment 2: Condition #19 of General Certification 3699 requires that the construction corridor
through wetlands and at stream crossings be limited to 40 feet. The plans indicate a 40 foot
permanent corridor, as well as an additional 10 foot construction easement through wetlands. It
appears the construction corridor could be minimized in wetland areas to reduce wetland impacts
in accordance with the avoidance and minimization criteria. Please modify the construction
drawings appropriately to meet the permit condition and minimize unnecessary impacts.
Response to Comment. We have added notes on the construction plans indicating that the
construction corridor across wetlands and stream crossings throughout the project shall be
minimized to 15-feet in width and construction fencing shall be installed as shown on the
plans. We've enclosed revised sheets 3, 5, 6, 10, and 16.
Comment 3: Condition #20 of General Certification 3699 requires that the permanent utility
easement through wetlands and at stream crossings be limited to 15 feet. The plans indicate a
permanent utility easement of 40 feet throughout the project.
Ms. Sue Homewood
NCDENR DWQ December 12, 2008 Page 2 of 2
Response to Comment: The permanent easements along Lines 100 and 101 will be used by
the City in the future for a public access and utility easement. There will be a walkway in the
future along these routes, adjacent to the sewer route, which is why a wider permanent
easement is required. Please excuse us for not disclosing this information sooner. During
the installation of the sewer line the disturbance will be limited to 15 feet, as stated in the
response to comment 2 above. We respectfully request that you issue a variance for all of
the stream and wetland crossings along lines 100 and 101, in light of this special
circumstance.
We would also like to request a variance along line 105 (sht. 16), due to the depth of the
proposed sewer line. Should future maintenance be required such that the sewer line need
be excavated, a width of 30 feet will be needed.
Please also note that in an effort to minimize impacts to streams, we are routing a sewer line across
a culvert instead of across the creek, at station 11 +00 (line 112) of sheet 22. We also have
eliminated the 10' temporary construction easements along most of sheets 5 and 6, in order to
minimize overall impacts.
If you or your staff have any questions or require additional information, please do not hesitate to
call our office, or email me at mpacini(@dmp-inc.com. We appreciate your assistance in this matter
and look forward to hearing from you.
Sincerely,
DAVIS-MARTIN-POWELL & ASSOCIATES, INC.
auricio M. P i
C: Ms. Ann Bailie, City of Trinity
Mr. Ian McMillan, DWQ RRO
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