20010357 Ver 1_More Info Received_20020802

IIQi LETTER OF
I\1\.L M
ASSOCIATES
TO: Todd St. John
NCDENR
1650 Mail Service Center
Raleigh, NC 27699-1650
TRANSMITTAL
DATE: July 31, 2002
PN: 01036
SENDING: ® Attached ? Under Separate Cover ® Via US Mail ? Overnight UPS/FedEx ? Courier ? To Be Picked Up By Recipient
Signed and Notarized Maintenance & Operations Manual
?j #
o t 035
3'•
- 22002
COMMENTS:
As requested
COPY TO:
SENT BY: I b --?
Shanda Daven rt, .E.
978 Trinity Road • Raleigh, North Carolina 27607 • Voice 919.854.0811 • Fax [phone] Email: [e-mail]

Upchurch Farms Residential Subdivision
Maintenance & Operation of Permanent Wet Detention Basin
These procedures establish methods for maintenance and operation of the wet detention basin,
to be constructed in conjunction with the development of the Upchurch Farms subdivision
according to plans prepared by Rice & Associates and revised to follow current phasing and
revisions.
After every rainfall event or at least monthly the following maintenance activities shall be
performed per the foregoing standards. The basin shall be inspected for sediment
accumulation, erosion, trash accumulation, vegetated cover, and general condition. Check
and clear orifice for any obstructions so that drawdown of the temporary pool occurs within 2 to
5 days.
Vegetation - The wet basin embankments and slopes that will have a ground cover of fescue,
which if properly maintained, will prevent erosion of the embankment and provide an easy
surface for inspection. The grass will be most difficult to maintain in the area subject to water
level fluctuation. Grass should be fertilized every October and April. Remove cattails and other
indigenous wetland plants when they cover 50% of the basin surface. These plants shall be
encouraged to grow along the vegetated shelf and forebay berm.
Re-Seeding - Periodic re-seeding may be required to establish grass on areas where seed did
not take or has been destroyed. Before seeding, fertilizer (12-12-12) should be applied at a
minimum rate of 12 to 15 pounds per 1,000 SF. The seed should be evenly sown at a rate of
three pounds per 1,000 SF. The seed should be covered with soil to the depth of approximately
'/a". Immediately following the planting, the area should be mulched with straw.
Mowing - Grass mowing, brush cutting and removal of weed vegetation will be necessary for
the proper maintenance of the embankments and slopes. Grass should be mowed when the
grass exceeds 6" in height. Acceptable methods include the use of weed whips or power brush
cutters and mowers.
Erosion - Erosion occurs when the water concentrates causing failure of the vegetation or when
vegetation dies and sets up the environment for rill erosion and eventually gullies from the
stormwater runoff. The basin should be inspected for these areas. Proper care of vegetative
areas that develop erosion is required to prevent more serious damage to the site. Rills and
gullies should be filled with suitable soil, compacted, and then seeded. Methods described
earlier on vegetation should be used to properly establish the grass surface. Where eroded
areas are detected, the cause of the erosion should be addressed to prevent a continued
maintenance problem. Frequently, problems result from the concentration of runoff to one
point of the basin instead of a uniform distribution of runoff. This can be corrected by
reshaping to more evenly distribute the runoff to areas not experiencing erosion problems.
Rodent Control - Rodents such as ground hogs, muskrats and moles are attracted to moist, wet
areas and can be quite dangerous to structural integrity and proper performance of the
earthwork and drainage. Groundhogs and muskrats thrive on burrowing into the manmade
earthwork, which become pathways for seepage. In the event that burrows are detected within
the wetland area, the rodents should be dealt with by removal.
Trash & Debris - Trash acts as a barrier to stormwater infiltration and attracts unwanted pests.
The basin should be kept clear of debris such as loose bottles, cans, food containers and other
forms of rubbish. The basin should be checked for debris after every storm event and cleared as
needed.
MAINTENANCE OF STORM DRAIN SYSTEM AND OUTLET CONTROL STRUCTURE
Inspection of Outlet Structure - The outlet structure should be inspected thoroughly once a year,
including the joints. Pipes should be inspected for proper alignment (sagging), elongation and
displacement at joints, cracks, leaks, surface wear, loss of protective coating, corrosion and
blocking. Problems with outlet structures most often occur at joints and special attention should
be given to them during inspection. Joints should be checked for gaps caused by elongation or
settlement and loss of joint filler material. Open joints can permit erosion of the earthwork and
possibly the piping of soil material through the joints. A depression in the soil surface over the
pipe may be a sign that soil is being removed from around the pipe.
Inspection of Storm Drain System - The storm drain collection system (catch basins, piping,
swales, riprap, etc.) shall be inspected thoroughly quarterly to maintain proper functioning.
Inspection of Level Spreaders - Level spreaders shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation
shall be maintained across the entire flow spreading structure. Any down gradient erosion must
be repaired or replanted as necessary.
OPERATION
Drain Pipes - Drainpipes should always be operable so that the water can be drawn down in
events of a severe rain or for repairs or maintenance. Operation of the basin should include
recording of the following:
Semi-Annual Inspection Reports - A collection of written inspection reports should be kept on
record. Inspection should be conducted semi-annually. Copies should be provided to Mr. John
Dorney, Wetlands/401 Unit, Raleigh Regional Office, NCDENR.
Observations - All observations should be recorded. Where periodic inspections are performed
following significant rainfall events, these inspections should be logged.
Maintenance - Written records of maintenance and/or repairs should be recorded.
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Other Operational Procedures - The owner should maintain a complete and up-to-date set of
plans (as-built drawings) and all changes made to the wetlands over time should be recorded
on the as-builts.
Sedimentation and Dredging - Sedimentation from on-site and off-site soils will eventually result
in the clogging of drainage pipes and reduction of storage and functional capacity, and will
have to be removed. Sediment should be removed after twelve inches of deposition, which the
permanent pool depth is reduced to a depth of 4 feet. The measuring device used to determine
the sediment elevation shall be such that it will give an accurate depth reading and not readily
penetrate into accumulated sediments. The frequency of this sediment removal can be reduced
by ensuring that the site areas around the building be stabilized with a vegetative ground cover
such that it restrains erosions. This would include a periodic application of fertilizer and other
treatment necessary to promote a stable ground cover and minimize sedimentation to the pond.
The removed material should be hauled offsite to a suitable spoil site and disposed of in
accordance with local, state, and federal rules and regulations.
Responsible Parties: Triton Upchurch
5660 Six Forks Road
Suite 202
Raleigh, NC 27609
[phone]
Person(s) or firm(s) financially responsible
1, 17?Pw Tit tie v i yw ",ecg " hereby acknowledge that I am the financially
responsible party for maintenance of the storm water detention basin. I will perform the
maintenance as outlined above for this project.
Signature: Date: 7 0-`Z-
1, MLA h Jn,,,s , a Notary Public for the State of North Carolina, county
of E do hereby certify that G cpaVP_'rQI 0V\ personally
appeared before me this _I Q'?' day of ur , 2002 and acknowle
due execution of the foregoing instrument. Witness my y hand and official seal.
Seal A-?J My commission expires

10

Person(s) or firm(s) responsible for crnaintenance
I,T-k J;F[ K cl« ; [ i(hereby acknowledge that I am the responsible party for
maintenance of the storm water detention basin. I will perform the maintenance as outlined
above for this project.
Signature: Date: 2q-o,2--
1, n.;cV'r'LP-[ - _ j?e5 , a Notary Public for the State of North Carolina, county
of Wake do hereby certify that Crter, [ ef%LLSOA personally
appeared before me this 2W? day of : \V , 2002 and acknowledge due
execution of the foregoing instrument. Witness my hand and official seal.
Seal My commission expires
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