20052082 Ver 1_More Info Received_20061016

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UNITED STATES MARINE CORPS
MARINE CORPS AIR STATION
POSTAL SERVICE CODE BOX 8003
CHERRY POINT, NORTH CAROLINA 28533-0003
Ms. Cyndi Karoly
North Carolina Division of Water Quality
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604
Dear Ms Karoly:

5090/18160
LN
October 11, 2006
This letter is to update you on the status of a culvert maintenance
project for which we initially contacted you in November of 2005. You
subsequently responded to our letter and Pre-Construction Notification
with two additional information requests, the last dated January 4,
2006, and referred to the project as DWQ Project #05-2082. Since the
time of this correspondence we requested and held a site visit with Mr.
Kyle Barnes of your Washington field office. This site visit occurred
on January 19, 2006.
Based on the guidance we received from Mr. Barnes we completed the
inspection and culvert repair phase only, using only sandbags to divert
water through adjacent piping, and removing the sandbags immediately
following completion of the work. These repairs involved sealing cracks
in the pipe, not complete replacement. The temporary placement of the
sandbags was authorized under NWP33/GC3366, and was done in accordance
with the conditions of this permit.
The remaining work
end of three culverts.
require re-grading and
are within 50 ft of the
the Neuse River Buffer
NCAC2B.0233.
includes bank stabilization in small areas at the
The enclosed drawings depict the areas that
stabilization with rip-rap. All of these areas
stream, and therefore within areas subject to
rules. Bank stabilization is allowable under 15A
Equipment access at Sites 1 and 3 is easily accomplished along the
existing power line right of way. Disturbance to buffer vegetation will
be minor, including temporary impacts from equipment operation to the
vines and herbaceous vegetation that are currently growing along the
banks. No trees would be removed in these locations. The upstream side
of the northern culvert at location 1 is not a regulatory issue since at
this point the waterway is a man-made ditch; the natural stream and
associated buffer begin at the downstream end of the culvert. The
upstream side of the southern culvert at site 1 is depicted as site 2 in
the drawings. The upstream side of culvert location 3 requires no
maintenance at this time.
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5090/18160
LN
October 11, 2006
Equipment access at site 2 requires the removal of several trees
within the 50 ft buffer area. These trees are less than 35 ft from
Cunningham Boulevard, directly above the headwall of the culvert. The
area of tree removal is indicated on the enclosed drawings.
During the site visit with Mr. Barnes a larger issue was recognized
at site 2; this site is experiencing bank subsidence from above due to a
broken concrete stormwater pipe that enters the .site from the south
along the roadway. This 73 ft long pipe is the end point of
approximately 700 ft of pipe and open drainage swales collecting
stormwater from a large parking lot and a section of Roosevelt Road.
The pipe is currently lying in several disjointed sections jutting out
of the hillside above the stream and is apparently the source of the
several small (approximately 16 in. diameter) blowouts under the roots
of the trees growing on that hillside. MCAS Cherry Point has decided to
correct this problem by installing a new subsurface drainage pipe in the
road shoulder (within the 50' buffer but currently vegetated in grass)
to redirect the flow into an existing drop inlet located above the
headwall, and re-grading and stabilizing the subsided areas mentioned
above. Additional disturbance of the riparian buffer to protect
existing structures is allowable under 15A NCAC2B.0233.
We feel that we have thoroughly addressed the concerns expressed
during the site visit with Mr. Barnes and in your correspondence. We
look forward to receiving your concurrence on the work described above.
If there are any further questions please contact Robin Ferguson at
[phone].
Sincerely,
FO
viron n 1 ffai s Officer
By directi of the
Commanding Officer
Enclosure: 1. Project Drawings
Copy to:
Scott Jones, USACE