SW4240201_O&M Agreement/Plan_20240209

Operation & Maintenance Agreement
Project Name: Sawmill Woods
Project Location: Forsyth County
Cover Page
Maintenance records shall be kept on the following SCM(s). This maintenance record shall be kept in a log in a known set location.
Any deficient SCM 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 pollutant removal efficiency of the SCM(s).
The 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: 5 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: 0 Location(s):
Disconnected Impervious Surface Present: No Location(s):
User Defined SCM Present: No Location(s):
Low Density Present: No Type:
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed for
each SCM above, and attached O&M tables. I agree to notify NCDEQ of any problems with the system or prior to any changes to the
system or responsible party.
Responsible Party: Ping Chen
Title &Organization: President,The CSC Group, LLC
Street address: 10030 Green Level Church Road,Suite 802#149
City, state, zip: Cary, North Carolina,27519
Phone number(s): 919-798-0429
Email: [e-mail]
Signature: ` ✓Z Date: l"mil t /2U Z
l I` ►� �• Hl. lk1C(C,AO j , a Notary Public for the State of ( tC.-
County of a IdJ2 , do hereby certify that ' rY- Ck 2,m
personally appeared before me this day of [ kQ( bar- 2 and
acknowledge the due execution of the Op rati s and intenance Agreem t.
Witness my;ha„darid official seal, .
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STORM-EZ 12/11/2023
Version 1.5 O&M Agreement Page 1 of 5

Wet Detention Pond Design Summary
WET POND ID FOREBAY MAIN POND
SCM-1 Permanent Pool El. 812 Permanent Pool El. 812
Temporary Pool El: 813.31 Temporary Pool El: 813.31
Pretreatment other No Clean Out Depth: 2 Clean Out Depth: 2.5
than forebay? Sediment Removal E 810 Sediment Removal EL 809.5
Has Veg. Filter? Yes Bottom Elevation: 809.5 Bottom Elevation: 809
WET POND ID FOREBAY MAIN POND
SCM-2 _J Permanent Pool El. 806 Permanent Pool El. 806
Temporary Pool El: _ 807.41 Temporary Pool El: 807.41
Pretreatment other No Clean Out Depth: 2 Clean Out Depth: 2.5
than forebay? Sediment Removal E 804 Sediment Removal E 803.5
Has Veg. Filter? Yes Bottom Elevation: 803.5 Bottom Elevation: 803
WET POND ID FOREBAY MAIN POND
SCM-3 Permanent Pool El. 808 Permanent Pool El. 808
Temporary Pool El: 809.62 Temporary Pool El: 809.62
Pretreatment other No Clean Out Depth: 2 Clean Out Depth: 2.5
than forebay? Sediment Removal E 806 Sediment Removal E 805.5
Has Veg. Filter? Yes Bottom Elevation: 805.5 Bottom Elevation: 805
WET POND ID FOREBAY MAIN POND
SCM-4 Permanent Pool El. 813 Permanent Pool El. 813
Temporary Pool El: 815.67 Temporary Pool El: 815.67
Pretreatment other No Clean Out Depth: 1 Clean Out Depth: 2.5
than forebay? Sediment Removal E. 812 Sediment Removal E 810.5
Has Veg. Filter? Yes Bottom Elevation: 811.5 Bottom Elevation: 810
WET POND ID FOREBAY MAIN POND
SCM-5 Permanent Pool El. 811 Permanent Pool El. 811
Temporary Pool El: 812.33 Temporary Pool El: 812.33
Pretreatment other No Clean Out Depth: 2 Clean Out Depth: 3.5
than forebay? Sediment Removal EL 809 Sediment Removal E 807.5
Has Veg. Filter? Yes Bottom Elevation: 808.5 Bottom Elevation: 807
ATTACH ADDITIONAL SHEETS IF NECESSARY

Wet Pond Maintenance Requirements (Continued)
SCM element: Potential problem: How to remediate the problem:
Sediment has
accumulated to a depth Search for the source of the sediment and remedy the problem
greater than the original if possible. Remove the sediment and dispose of it in a
design sediment storage location where it will not cause impacts to streams or the SCM.
depth.
The main treatment area Algal growth covers over Consult a professional to remove and control the algal growth.
50% of the area.
Cattails, phragmites or Remove the plants by wiping them with pesticide (do not
other invasive plants cover
50% of the basin surface. spray).
Best professional
practices show that
pruning is needed to Prune according to best professional practices.
maintain optimal plant
health.
The vegetated shelf Determine the source of the problem: soils, hydrology,
Plants are dead, diseased disease, etc. Remedy the problem and replace plants. Provide
or dying. a one-time fertilizer application to establish the ground cover if
a soil test indicates it is necessary.
Weeds are present. Remove the weeds, preferably by hand. If pesticide is used,
wipe it on the plants rather than spraying.
Shrubs have started to Remove shrubs immediately.
grow on the embankment.
Evidence of muskrat or Consult a professional to remove muskrats or beavers and
beaver activity is present. repair 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 shows that Make all needed repairs immediately.
the embankment needs
repair.
Clogging has occurred. Clean out the outlet device and dispose of any sediment in a
gg g location 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.
Weeds or volunteer trees Remove the weeds or trees.
are growing on the mat.
Floating wetland island
(if applicable) The anchor cable is
damaged, disconnected or Restore the anchor cable to its design state.
missing.