SW6201004_O&M Agreement_20210126

Project Name:
Project Location:
BlackhawkLanding
Rockfish Road, Hoke County NC
'Cover Page
Maintenance records shall be kept on the following BMP(s). This maintenance record shall be kept in a log in a known set
location. Any deficient BN1Pelements noted in the inspection will be corrected, repaired, or replaced immmmmdimte!y. These
deficiencies can affect the integrity of structures, safety of the public, and the pollutant removal efficiency of the BMP(s).
The BMP(s) on this project include (check all that apply & corresponding O&M tables wil
BiorehandonCeU Quantity:
Dry Detention Basin Quantity:
Grassed Swale Quantity.-
Green Roof Quantity
Infiltration Basin Quantity:
Infiltration Trench Quantity:
Level SproedanVFS Quantity:
Permeable Pavement Quantity:
Proprietary System Quantity:
Rainwater Harvesting Quantity:
Sand Filter Quantity:
StormwaterVVet|and Quantity:
Wet Detention Basin Quantity:
Disconnected Impervious Area Present:
User Defined BNYP Present:
Locotkzn(o):
Looetion(s):
L000tion(s):
Locatio(e):
L000tion(o):
Locotkon(e):
Looaton(a):
Looabon(e):
Locadon(a):
Locadon(n):
Location(m):
Looabon(a):
Locabon(o):
Location(o):
Louetion(a):
iDe aaaea auomonoa/
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed
for each B[NPabove, and attached O&M tables. | agree tonotify NCDENRofany problems with the system orprior toany
changes tothe system orresponsible party.
° Responsible Party:
Title &Organization:
Street address:
Cdy, shaba. zip:
Phonenumber(s):
Email:
Signature:
i J''`^ u� v(-%--
Hendrix Brothers of Hoke, ILLC
Ralph Huff -Managing Partner
910-302-3608
County of .do hearby certify that
personally appeared before mothis day of and
acknowledge the due execution ofthe Operations a,nd Maintenance Agreement
Witness my hand and official seal, Ja to V-11
MY
COMMIS" EXPIRES
UBUG
My commission expires
STORM-E
Version 14
O&M Manual
1/512O21
Page 1of4

The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if
one ioprovided.
Important maintenance procedures
_ Immediately after the wet detention basin is estab|iahed. the plants on the vegetated shelf and perimeter ofthe
basin should be watered twice weekly if needed, until the plants become established (commonly six weeka).
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 must be drained for an emergency or to perform maintenance, the flushing of sediment through the
emergency drain should beminimized tothe maximum extent practical.
- Once o year, a dam safety expert should inspect the embankment.
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.Oinches (or 1.5inches ifimaCoastal County). Records ofoperation and maintenance should bekept ino
known set location and must beavailable upon request.
Inspection activities shall beperformed aofollows, Any problems that are found shall berepaired immediately.
BMP element:
Potential problem:
How I will remediate the problem:
The entire IBMP
Trash/debris is present.
Remove the trash/debris.
The perimeter of the BMP
Areas of bare soil and/or
Regrade the soil if necessary to remove the gully, and then plant a
erosive gullies have formed.
ground cover and water until it is established. Provide lime and a one-
time fertilizer application,
Vegetation is too short or too
Maintain vegetation at a height of approximately six inches.
The inlet device
The pipe is clogged.
Unclog the pipe. Dispose of the sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged.
Erosion is occurring in the
Regrade the swale if necessary to smooth it over and provide erosion
swale.
control devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or
Remove sediment and replace with clean stone.
covered in sediment (if
The forebay
Sediment has accumulated to
Search for the source of the sediment and remedy the problem if
a depth greater than the
possible. Remove the sediment and dispose of it in a location where
original design depth for
it will not cause impacts to streams or the BMP.
sediment storage.
Erosion has occurred.
Provide additional erosion protection such as reinforced turf matting or
riprap if needed to prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by hand. If pesticide is used, wipe it
on the plants rather than spraying.
The vegetated shelf
Best professional practices
Prune according to best professional practices
show that pruning is needed
to maintain optimal plant
Plants are dead, diseased or
Determine the source of the problem: soils, hydrology, disease, etc.
dying.
Remedy the problem and replace plants. Provide a one-time fertilizer
application to establish the ground cover if a soil test indicates it is
Weeds are present.
Remove the weeds, preferably by hand. If pesticide is used, wipe it
on the plants rather than spraying.
STORM-EZ 1/5/2021
Version 1* O&M Manual Page 2of4

Wet Detention Pond Maiintenatide Riouirements,(CbintInped),
The main treatment area
Sediment has accumulated to
Search for the source of the sediment and remedy the problem if
a depth greater than the
possible. Remove the sediment and dispose of it in a location where
original design sediment
it will not cause impacts to streams or the BMP.
storage depth.
Algal growth covers over 50%
Consult a professional to remove and control the algal growth.
of the area.
Cattails, phragmites or other
Remove the plants by wiping them with pesticide (do not spray).
invasive plants cover 50% of
the basin surface.
The embankment
Shrubs have started to grow
Remove shrubs immediately.
on the embankment.
Evidence of muskrat or
Use traps to remove muskrats and consult a professional to remove
beaver activity is present.
beavers.
A tree has started to grow on
Consult a dam safety specialist to remove the tree.
the embankment.
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 replace the outlet device.
The receiving water
Erosion or other signs of
Contact the local NC Department of Environment and Natural
damage have occurred at the
Resources Regional Office.
outlet.
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.
STORM-EZ 1/5/2021
Version 1.4 O&M Manual Page 3 of 4