20061804 Ver 11_O and M Agreement_20150803

Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Bioretention Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important operation and maintenance procedures:
— Immediately after the bioretention cell is established, the plants will be watered
twice weekly if needed until the plants become established (commonly six
weeks).
— Snow, mulch or any other material will NEVER be piled on the surface of the
bioretention cell.
— Heavy equipment will NEVER be driven over the bioretention cell.
— Special care will be taken to prevent sediment from entering the bioretention cell.
— Once a year, a soil test of the soil media will be conducted.
After the bioretention cell is established, I will inspect it 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 will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
The entire BMP
The perimeter of the
bioretention cell
The inlet device: pipe,
stone verge or swale
Potential problems:
Trash /debris is present.
Areas of bare soil and /or
erosive gullies have formed.
The pipe is clogged (if
applicable).
The pipe is cracked or
otherwise damaged (if
applicable).
Erosion is occurring in the
swale (if applicable).
Stone verge is clogged or
covered in sediment (if
applicable).
How I will remediate the problem:
Remove the trash /debris.
Regrade the soil if necessary to
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one -time fertilizer application.
Unclog the pipe. Dispose of the
sediment off -site.
Replace the pipe.
Regrade the swale if necessary to
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Remove sediment and clogged
stone and replace with clean stone.
Form SW401- Bioretention O &M -Rev.3 Page 1 of 4

BMP element: Potential problems: How I will remediate the problem:
The pretreatment area Flow is bypassing Regrade if necessary to route all
pretreatment area and /or flow to the pretreatment area.
gullies have formed. Restabilize the area after grading.
Sediment has accumulated to Search for the source of the
a depth greater than three sediment and remedy the problem if
inches. possible. Remove the sediment and
restabilize the pretreatment area.
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.
The bioretention cell: Best professional practices
Prune according to best professional
vegetation 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 application to establish the
ground cover if a soil test indicates
it is necessary.
Tree stakes /wires are present
Remove tree stake /wires (which
six months after planting.
can kill the tree if not removed).
The bioretention cell: Mulch is breaking down or
Spot mulch if there are only random
soils and mulch has floated away.
void areas. Replace whole mulch
layer if necessary. Remove the
remaining much and replace with
triple shredded hard wood mulch at
a maximum depth of three inches.
Soils and /or mulch are
Determine the extent of the clogging
clogged with sediment.
- remove and replace either just the
top layers or the entire media as
needed. Dispose of the spoil in an
appropriate off -site location. Use
triple shredded hard wood mulch at
a maximum depth of three inches.
Search for the source of the
sediment and remedy the problem if
possible.
An annual soil test shows that
Dolomitic lime shall be applied as
pH has dropped or heavy
recommended per the soil test and
metals have accumulated in
toxic soils shall be removed,
the soil media.
disposed of properly and replaced
with new planting media.
Form SW401- Bioretention O &M -Rev.3 Page 2 Of 4

BMP element:
The underdrain system
(if applicable)
The drop inlet
The receiving water
Potential problems:
Clogging has occurred.
Clogging has occurred.
The drop inlet is damaged
Erosion or other signs of
damage have occurred at the
outlet.
How I will remediate the problem:
Wash out the underdrain system.
Clean out the drop inlet. Dispose of
the sediment off -site.
Repair or replace the drop inlet.
Contact the NC Division of Water
Quality 401 Oversight Unit at 919-
733 -1786.
Form SW401- Bioretention O &M -Rev.3 Page 3 of 4

Permit Number:
(to be provided by DWQ)
I 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 changes to the system or responsible party.
Project name: Flowers Plantation River Dell East (Pod NE -12_
BMP drainage area number:NA
Print name:Rebecca Flowers
Title:Owner / Developer
Address:4880 NC 42 East. Clavton. NC 27520
Phone:
Signature:
Date:
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.
I,
, a Notary Public for the State of
County of , do hereby certify that
personally appeared before me this
day of and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
SEAL
My commission expires
Form SW401- Bioretention I &M -Rev. 2 Page 4 Of 4