SW5230802_O&M Agreement/Plan_20231222

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Project Name: Chatham Habitat for Humanity Townhouse Development
Project Location:,Siler City, NC
Cover Page
aintenance records shall be kept on the following SCM(s). This maintenance record shall be kept in a log in a known set location.
ly deficient SCM elements noted in the inspection will be corrected, repaired, or replaced immediately. These deficiencies can
fect the integrity of structures, safety of the public, and the pollutant removal efficiency of the SCM(s).
ie SCM(s) on this project include (check all that apply & corresponding O&M sheets will be added automatically):
Infiltration Basin Quantity: 0 Location(s):
Infiltration Trench Quantity: 0 Location(s):
Bioretention Cell Quantity: 0 Location(s):
Wet Pond Quantity: 0 Location(s):
Stormwater Wetland Quantity: 0 Location(s):
Permeable Pavement Quantity: 0 Location(s):
Sand Filter Quantity: 0 Location(s):
Rainwater Harvesting Quantity: 0 Location(s):
Green Roof Quantity: 0 Location(s):
Level Spreader- Filter Strip Quantity: 0 Location(s):
Proprietary System Quantity: 0 Location(s):
Treatment Swale Quantity: 0 Location(s):
Dry Pond Quantity: 1 Location(s): Southwest portion of property
Disconnected Impervious Surface Present: No Location(s):
User Defined SCM Present: No Location(s):
Low Density Present: No Type:
acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed for
ich SCM above, and attached O&M tables. I agree to notify NCDEQ of any problems with the system or prior to any changes to
e system or responsible party.
Responsible Party: Chatham Habitat for Humanity
Title & Organization: Anna Tuell, Finance and Development Director
Street address: 467 West St.
City, state, zip: Pittsboro, NC 27312
Phone number(s): 919-542-0794
Email: [e-mail]
Signature: 0711/4rThDate: 1;�Q,1✓ 1` iinev-q.l� w. R.vk(,.r , a Notary Public for the State of I`V Q tP-444. vo
Dunty of Chkt,o,n,,, , do hereby certify that utVlp� wZ�
sonaily appeared before me this 1(g4k day of C1- tc.,Q.4,,, 6(,- and ZD23
:knowledge the due execution of the •,`tions and Mainten.. greement .
'itness my hand and official seal �1140,_. .14
RODERICK W PARKE' -
Notary Public=North Ca olina
Chatham County
My Commission Expires Nov 7,2027
9a! My commission expires
ORM-EZ 12/18/2C

Dry Pond Maintenance Requirements
Important operation and maintenance procedures:
- The drainage area will be managed to reduce the sediment load to the dry pond.
- Immediately after the dry pond is established, the vegetation will be watered twice weekly if needed until
the plants become established (commonly six weeks).
- After the initial fertilization to establish vegetation in the dry pond, fertilizer will not be applied to the dry
pond.
- The vegetation in and around the basin will be maintained at a height of approximately six inches.
- At least once annually, a dam safety expert will inspect the embankment. Any problems that are found
will be repaired immediately.
After the dry pond is established, it shall 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 shall be kept in a known
set location and shall be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
SCM element: Potential problem: How to remediate the problem:
The entire SCM Trash/debris is present. Remove the trash/debris.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground
The perimeter of the SCM erosive gullies have cover and water until it is established. Provide lime and a one-
formed. time fertilizer application.
The inlet pipe is clogged (if Unclog the pipe. Dispose of the sediment in a location where it
applicable). will not cause impacts to streams or the SCM.
The inlet pipe is cracked or
The inlet device otherwise damaged (if Repair or replace the pipe.
applicable).
Erosion is occurring in the Regrade the swale if necessary and provide erosion control
Erosion
(if applicable). devices such as reinforced turf matting or riprap to avoid future
swaleproblems with erosion.
Sediment has accumulated Search for the source of the sediment and remedy the problem if
to a depth greater than the possible. Remove the sediment and dispose of it in a location
original design depth for where it will not cause impacts to streams or the SCM.
sediment storage.
The forebay
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.
Sediment has accumulated Search for the source of the sediment and remedy the problem if
to a depth greater than the possible. Remove the sediment and dispose of it in a location
original design depth for where it will not cause impacts to streams or the SCM.
sediment storage.
The main treatment area Water is standing more Check the outlet structure for clogging. If it is a design issue,
than 5 days after a storm consult an appropriate professional.
event.
Weeds and noxious plants Remove the weeds, preferably by hand. If pesticide is used, wipe
are growing in the main it on the plants rather than spraying.
treatment area.

Dry Pond Maintenance Requirements (continued)
SCM element: Potential problem: How to remediate the problem:
Shrubs have started to Remove shrubs immediately.
grow on the embankment.
Evidence of muskrat or Consult a professional to remove muskrats or beavers and repair
beaver activity is present. any holes or erosion.
The embankment A tree has started to grow Consult a dam safety specialist to remove the tree.
on the embankment.
An annual inspection by an
appropriate professional Make all needed repairs immediately.
shows that the
embankment needs repair.
Clogging has occurred. Clean out the outlet device. Dispose of the sediment in a location
gg g where it will not cause impacts to streams or the SCM.
The outlet device
The outlet device is Repair or replace the outlet device.
damaged
Erosion or other signs of
damage have occurred at Repair the damage and improve the flow dissipation structure.
the outlet.
The receiving water Discharges from the dry
pond are causing erosion Contact the local NCDEQ Regional Office.
or sedimentation in the
receiving water.

Dry Detention Pond Design Summary
Dry Pond Diagram
DRY POND ID FOREBAY MAIN POND
1 Temporary Pool El: 613.5 Temporary Pool El: 613.5 _
Clean Out Depth: 1.5 Clean Out Depth: 1.5
Pretreatment Yes Sediment Storage El: 612 Sediment Storage El: 612
Has Veg. Filter No Bottom Elevation: 612 Bottom Elevation: 612