SW1200502_Bioretention O&M Agreement_5/14/2020

Permit Number:
(to be provided by DWQ)
Drainage Area Number:.
Bioretention Operation and Maintenance Agreement
l 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 bewatered
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:
Potential roblems:
How I will remediate.the problem:
The entire BMP
Trash . debris is present.
Remove the trash/ debris.
The perimeter of the
bioretention cell
Areas of bare soil. and/or
erosive gullies have formed.
Regrade the soil if.,necessary to
remove the gully, and then plant a
ground cover and water untilit is
established. Provide lime. and a
one-time fertilizer application.
The inlet device: pipe,
The pipe is clogged (if
Unclog the pipe. Dispose of the
stone verge. or.swale
applicable).
sediment off -site.
The pipe is cracked or
Replace the pipe.
otherwise damaged (if
applicable).
Erosion is..occurring in the
Regrade the Swale if necessary to
swale (if applicable).
smooth it over and provide erosion
control devices such. as reinforced
turf matting or riprap to avoid
future problems with erosion.
Stone verge is clogged or
Remove sediment and clogged
covered in sediment.(if
stone and replace with clean stone.
a livable},
Form SW40 1. -Bioretention O&M-Rev.3 Page l of

BMP element:
Potential roblems:
How I will remediate:theproblem:
The pretreatment area
FIow.is bypassing.
Regrade if necessary to route all.
pretreatment -area and/or
flow to the pretreatment area.
flies have formed.
Restabilize the area after grading.
Sediment has accumulated to
Searchfor the source of the
a depth greater than three
sediment and remedy the problem if
inches.
possible. Remove the sediment and
restabilize the. pmeatment area.
Erosion has occurred.
Provide additional erosion
protection such as reinforced turf
mattingor 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 wares are present
Remove tree stake wires (which
six months after planting.
can kill the tree if not xemoved).
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.
- remcsve. 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
ossible.
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
Potential,problems-
Clogging has: occurred.
Howl will remediatf the rolilem:
Wash out the underdrain.system...
if a licable
Thedrop inlet
Clogging has Occurred_
Clean out the.drop inlet. Dispose of
the sediment off -site.
The dro inlet .is c3 azna ed
Re .ai..r or re lace. the dro inlet.
The receiving water
Erosion or other signs of
damage have occurred at the.
Contact the NC Division. of Water
Quality. 401 .Oversight Unit at 91.9-
outlet.
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`narne:North Carolina Arboretum Parking Exa nsion & Reconfiguration
BMP drainage area numher:l
Print name:Geox e Briggs
Title:Executivr Director
Address.100 Frederick Lave Olmstead WE. Asheville NC 28806
Phone: (82n 665-2492
Signature, I
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.
Notary Public for the State of
`3 .A,c- , County ofdo hereby certify that
_ personally appeared before me this
day of n , and acknowledge the due execution of the
forgoing bioret tion maintenance requirements. Witness my hand and official seal,
i �AOTAp.), "p
- M'
1. 2 2_ _ G
SEAL
My commission expires
Form SW401-Rioreterttion ]&M-Rev. 2 Page 4 .of 4