SW4240202_O&M Agreement/Plan_20240617

Permit Number:
(to be provided by DWQ)
Drainage Area Number: 1
Sand Filter 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 maintenance procedures:
— The drainage area will be carefully managed to reduce the sediment load to the sand filter.
— The sedimentation chamber or forebay will be cleaned out whenever sediment depth exceeds
six inches.
— Once a year,sand media will be skimmed.
— The sand filter media will be replaced whenever it fails to function properly after maintenance.
The sand filter will be inspected quarterly 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:111.1. Potential problem: mm. How I will remediate the problem: -
Entire BMP Trash/debris is present. Remove the trash/debris.
Adjacent pavement(if Sediment is present on the Sweep or vacuum the sediment as soon as
applicable) pavement surface. possible.
Perimeter of sand filter Areas of bare soil and/or erosive Regrade the soil if necessary to remove the
gullies have formed. gully,and then plant a ground cover and
water until it is established. Provide lime
and a one-time fertilizer application.
Vegetation is too short or too long. Maintain vegetation at an appropriate
height.
Flow diversion structure The structure is clogged. Unclog the conveyance and dispose of any
sediment offsite.
The structure is damaged. Make any necessary repairs or replace if
damage is too large for repair.
Forebay or pretreatment area Sediment has accumulated to a Search for the source of the sediment and
depth of greater than six inches. remedy the problem if possible. Remove
the sediment and stabilize or dispose of it
in a location where it will not cause
impacts to streams or the BMP.
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
a pesticide is used,wipe it on the plants
rather than spraying.
Form SW401-Sand Filter O&M-Rev.4 2009Septl7 Page 1 of 3

BMP element: Potential problem: How I will remediate the problem: .11
Filter bed and underdrain Water is ponding on the surface for Check to see if the collector system is
collection system more than 24 hours after a storm. clogged and flush if necessary. If water
still ponds,remove the top few inches of
filter bed media and replace. If water still
ponds,then consult an expert.
Outlet device Clogging has occurred. Clean out the outlet device. Dispose of the
sediment offsite.
The outlet device is damaged Repair or replace the outlet device.
Receiving water Erosion or other signs of damage Contact the NC Division of Water Quality
have occurred at the outlet. 401 Oversight Unit at 919-733-1786.
Form SW401-Sand Filter O&M-Rev.4 2009Sept17 Page 2 of 3

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:Twin Oaks Landscaping Site Improvements
BMP drainage area number: 1
Print name:Thomas W. Reece
Title: President
Address: 8970 NC HZWYf105 S STE 2, BOONE, NC 28607
Phone: 'a�— LI 50- 50 f tQ
Signature:
Date: 13) ao `A
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, 1 426Cip • WAtea , a Notary Public for the State of
' 1: 1 f I,1cc , County of � L , do hereby certify that
v
a
j OWA 1/0; tea- personally appeared before me this 13 day of
du*si_
, at„)-4 , and acknowledge the due execution of the forgoing sand filter
maintenance requirements. Witness my hand and official seal,
HALVE D WILLIS
NOTARY PUBLIC
AVERY COUNTY,NC
My Commission Expires 3-18-2026
SEAL
My commission expires '3-- 1$ OrD
Form SW401-Sand Filter O&M-Rev.4 2009Septl 7 Page 3 of 3