SW6100701_O&M Agreement Form_20100629

DENR—FR0
i'eriiiii Number: Stt%6�/oc)'?o/
NUV y 6 2010 (!u he prm'ided 11r DINU)
t UI Draina-e Area Number:_
Wet DetentioniBv � Operation and Maintenance Agreement
I will keep a maintenance record oil this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection xvill be
corrected, repaired or replaced immediately. "These deficiencies call affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
The wet detention basin system is defined as the vet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
❑ does © does not incorporate a vegetated filter at the outlet.
This system (check ogre):
❑ does © does not incorporate pretreatment other than a forebay.
Important maintenance procedures:
Immediately after the wet detention Basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered hvice weekly if
needed, until the plants become established (commonly six weeks).
No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
— If the basin inust be drained for an emergency, or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
-- Once a.year, a clam safeh, expert should inspect the ernbankinent.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches. if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Antr problems that are found shall
be repaired immediately.
BMP element:
Potentialproblem:
How I will remediate theproblem:
The entire BMP
Trash/debris is present.
Remove Hie trash/debris.
The perimeter of the wet
Areas of bare soil and/or
Regrade the soil if necessary to
detention basin
erosive gullies have formed,
remove the gully, and then }plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer a > >lication.
Vegetation is too short or trio
Maintain vegetation at a height of
1011 .
a p pro,\i nately SIX Inches,
Form SW401-Wet Delerition Basiii O&M-Rev.4
Pare 1 of'4

.4*V .
['omit Number: rat%6/00 70
(!o hc' 1 rol'idvel by 1)1110)
Drainage Area Numbcr. /
BMP element:
Potential Croblem.
How I will remediate theproblem:
The inlet device: pipe or
The Pipe is clogged.
Unclog the pipe. Dispose of the
swale
sediment off -site.
The pipe is cracked or
Replace the pipe,
otherwise damaged.
I-rosion is occurring in the
Regrade the swale if necessary to
Swale.
smooth it over and provide erosion
C0I1trOl &VICes such as reinforced
turf matting or rlprap to avoid
future problems with erosion.
The forebay
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design depth for
Possible. Remove the sediment and
sediment storage.
dispose of it in a location ,-here it
will not cause impacts to streams or
the 13NIP.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
LNeeds are present.
Remove the weeds, Preferable by
hand. If pesticide Is used, %ViPC it Oil
the plants rather than spraying.
The vegetated shelf
Best professional practices
Prune according to best professional
show that pruning is needed
practices
to maintain optimal plant.
health.
Plants are dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer applicithi-m to establish 'the
ground cover if a soil test indicates
It Is necessarv.
Weeds are present.
Remote [he weeds, preferable by
hand. If pesticide is used, wipe it on
the 21ants rather than spraying.
The main treatment area
Sediment has accumulated to
Search for the source of the
a depth greater than the
sediment and remedy the problem if
original design sediment
possible. Remove the sediment and
storage depth.
dispose of it in a location where it
wilI riot cause impacts to streams or
the 13MP.
Algal growth covers over
Consult a professional to remove
50% of the area.
and control the algal growth.
Cattails, phragmites or other
Remove the Plants by wiping them
invasive plants cover 50% of
with pesticide (do not spray).
the basin surface.
Form SW401-Vet Detention Basin 0&M-Rev.4 Page 2 of 4

Permit Numhcr: 54✓61 nv 9Q/
0o be provided hr VIVO)
Draina�,e Area dumber: /
BMP element:
Potential roblenl:
1-low I will renlediate theproblem:
The embankment
Shrubs have started to grow
Remove shrubs immediately.
on the embankment.
Evidence of muskrat or
Use traps to 'remove muskrats and
beavei- activity is present.
CollSUlt a professional to remove
beavers.
A tree has started to grow on
Consult a clam safety specialist to
the embankment.
remove the htee.
An annual inspection by an
Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. if applicable)
The outlet device
Clogging has occurred.
Clean out the outlet device. Dispose
of the sediment off -site.
The outlet device is damaged
Repair or re place the outlet device.
The receiving water
hrosion or other signs of
Contact the local NC Division of
damage have occurred at the
4,Vater Qualih, Regional Office, or
outlet.
the 401 Oversight Unit at 919-733-
17W
The measuril-Ig 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.
When the permanent pool depth reads 3.0 Feet in the main pond, the sediment
shall be removed.
When the T erI'.lanent pool depth reads 3.0 feet In the for( bay, the sedin1(:lit
5hal] be removed,
U
Sediment Removal E 173.5{1
t3ott0tlll IcVallor 172.5 1
F0REBAY
13ASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 173.50
e nrrtten Pool
Volume Sediment ltenuwal L levotion ] 70.50 Volume
Sediment
Stom-C
Bottom 1=levation 169.50
MAIN POND
�Il.
�edimem
Storage
Donn SW401-Wet Detention Basin 0&M-Rev.4
Pace 3 ol'4

E'ermit iti'umbe�: Seti/61 00'20
(it) hc• pro I.0ed ht' 1)1 O)
1 acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any chanIges to the system or responsible party.
1'iajec! iiCli7ie: `1
BA4P (Iroin ue (1rca liilA ber: I
Print name: __j ck%4 �;;�; PCC ._L ��sljk+r;�s AL L
Title:
Address: `7 /-AL��`� L),. e 301 -I-d %��lll ,Y'
Signature:
Date: L.1 Z° ,vy e, .
Note: The legally responsible party should not be a homeowners association unless more than 50` , of
the lots have been sold and a resident of the subdivision has been named the president.
1, rIJh a Notary Public for the State of
klt'i'a,-el County of �'Gf,h b�, /c,,,cl do hereby certify that
J Acre k�i /r _ _ personally appeared before me this Jel
day of _. I,•tnz J01 L' and acknowledge the due execution of the
Forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
_~ Q >`IoiatY Public _
Cumbet4ancd CvuntY
.'T
Oz?rf-f C ?0s�`��
SEAL
My commission expires 5.a3 (!
Form SW401-Wet Detention Basin O&M-Rev.4 Page 4 of 4