SW3200401_17031-PH2 O&M EZ_20200612

Operation & Maintenance Agreement u
Project Name: Village at Granite Quarry - Phase 2
Project Location: 3040 Faith Road, Salisbury, Rowan Co, NC 28146
Cover Page 11111
Maintenance records shall be kept on the following BMP(s). This maintenance record shall 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 pollutant removal efficiency of the BMP(s).
The BMP(s) on this project include(check all that apply&corresponding O&M tables will be added automatically):
Bioretention Cell Quantity: 0 Location(s):
Dry Detention Basin Quantity: 1 Location(s): BMP#7
Grassed Swale Quantity: 3 Location(s):
Green Roof Quantity: 0 Location(s):
Infiltration Basin Quantity: 0 Location(s):
Infiltration Trench Quantity: 0 Location(s):
Level SpreaderNFS Quantity: 0 Location(s):
Permeable Pavement Quantity: 0 •Location(s):
Proprietary System Quantity: 0 Location(s):
Rainwater Harvesting Quantity: 0 Location(s):
Sand Filter Quantity: 1 Location(s): BMP#7
Stormwater Wetland Quantity: 0 Location(s):
Wet Detention Basin Quantity: 1 Location(s): BMP#8
Disconnected Impervious Area Present: No Location(s):
User Defined BMP Present: No Location(s):
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed
for each BMP above, and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any
changes to the system or responsible party.
* Responsible Party: Jeff Webb
Title&Organization: VP of Land Development I LGI Homes
Street address: 3037 Sherman Drive
City, state, zip: Lancaster, SC 29720
Phone number(s): 704-297-0693
Email: [e-mail]
Signature: Date: — n` Ci»5
1, 'RQ,y la Mar) j Isar\ , a Notary Public for the State of l Nov n Cavb t h(�
County of PAU,k.LQ-11 lout jq (A)tt, do hearby certify that Je-F+ b
personally appeared before me this `J 161 day of itin9LASi— �(j l Q and
acknowledge the due execution of the Operations and Maintenance Agreement.
/.)
Witness my hand and official seal, y,�,,Q �7, / g uI
MARIF '''�•,,
p #9,9.
/ Comm. Exp
m 09-30-2023 =U
s i�'�:, 0 2 r My commission expires 00—BO— 2023
Sealy, 4,''•• o
STOrm EZ ��s 0/ G t1CO`,,? 5/15/2019
Version 1.4 O&M Manual Page 1 of 9

Dry Detention Pond Maintenance Requirements
Important maintenance procedures:
- The drainage area will be managed to reduce the sediment load to the dry extended detention basin.
- Immediately after the dry extended detention basin is established, the vegetation will be watered twice weekly if needed
until the plants become established (commonly six weeks).
- No portion of the dry extended detention pond will be fertilized after the first initial fertilization that is required to establish
the vegetation.
- The vegetation in and around the basin will be maintained at a height of approximately six inches.
- If cracks, seepage, or woody vegetation is present, consult a dam safety expert for a dam inspection.
The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
After the dry detention basin is established, it will be inspected quarterly. Inspection activities shall be performed as follows and
any problems identified will be remediated immediately per the table below.
BMP element: Potential problem: How to remediate the problem:
The entire BMP Trash/debris is present. Remove the trash/debris.
The perimeter of the BMP Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then plant a
erosive gullies have formed. ground cover and water until it is established. Provide lime and a one-
time fertilizer application.
Vegetation is too short or too Maintain vegetation at a height of approximately six inches.
long.
The inlet device The pipe is clogged. Unclog the pipe. Dispose of the sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to smooth it over and provide erosion
swale. control devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or Remove sediment and replace with clean stone.
covered in sediment(if
applicable).
The forebay Trash/debris is present. Remove the trash/debris.
Erosion has occurred or Provide additional erosion protection such as reinforced turf matting or
riprap is displaced. riprap if needed to prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by hand. If pesticides are used, wipe
them on the plants rather than spraying.
STORM-EZ 8/23/2019
Version 1.4 O&M Manual Page 3 of 10

Dry Detention Pond Maintenance Requirements (continued)
BMP element: Potential problem: How to remediate the problem:
The main treatment area Sediment has accumulated Search for the source of the sediment and remedy the problem if
and reduced the depth to 75% possible. Remove the sediment and dispose of it in a location where it
of the original design depth will not cause impacts to streams or the BMP. Revegetate disturbed
(per pond design data sheet) areas immediately with sod (preferred)or seed protected with securely
staked erosion mat.
Water is standing more than Check outlet structure for clogging. If it is a design issue, consult an
5 days after a storm event. appropriate professional.
Weeds and noxious plants Remove the plants by hand or by wiping them with pesticide (do not
are growing in the main spray).
treatment area.
The embankment Shrubs or trees have started Remove shrubs or trees immediately.
to grow on the embankment.
Grass cover is unhealthy or Restore the health of the grass cover—consult a professional if
eroding. necessary.
Signs of seepage on the Consult a professional.
downstream face.
Evidence of muskrat or Use traps to remove muskrats and consult a professional to remove
beaver activity is present. beavers.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs repair.
The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural
damage have occurred at the Resources Regional Office.
outlet.
STORM-EZ 8/23/2019
Version 1.4 O&M Manual Page 4 of 10

Dry Detention Pond Design Summary
Dry Pond Diagram
DRY POND ID FOREBAY MAIN POND
BMP#8 Temporary Pool El: 736.72 Temporary Pool El: 736.72
Clean Out Depth: 3.72 Clean Out Depth: 3.72
Pretreatment Yes Sediment Storage El: 733 Sediment Storage El: 733
Has Veg. Filter Yes Bottom Elevation: 733 Bottom Elevation: 733
STORM-EZ 8/23/2019
Version 1.4 O&M Manual Page 5 of 10

Grassed Swale Maintenance Requirements
Important maintenance procedures:
_ The drainage area of the grassed swale will be carefully managed to reduce the sediment load to the grassed
swale.
_ After the first-time fertilization to establish the grass in the swale, fertilizer will not be applied to the grassed
swale.
The grassed swale will be inspected once a quarter. 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 problem: How to remediate the problem:
The perimeter of the BMP Areas of bare soil and/or 'Regrade the soil if necessary to remove the gully, and then plant a
erosive gullies have formed. ground cover and water until it is established. Provide lime and a one-
time fertilizer application.
Vegetation is too short or too Maintain vegetation at a height of approximately six inches.
long.
The entire length of the Trash/debris is present. Remove the trash/debris.
swale Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re-sod (or
erosive gullies have formed. plant with other appropriate species) and water until established.
Provide lime and a one-time fertilizer application.
Sediment covers the grass at Remove sediment and dispose in an area that will not impact streams
the bottom of the swale. or BMPs. Re-sod if necessary.
Vegetation is too short or too Maintain vegetation at a height of approximately six inches.
long.
The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural
damage have occurred at the Resources Regional Office.
outlet.
STORM-EZ 8/23/2019
Version 1.4 O&M Manual Page 6 of 10

Sand Filter Maintenance Requirements
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 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 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 problem: How to 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 possible.
applicable) pavement surface.
Perimeter of sand filter Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then plant a
erosive gullies have formed. ground cover and water until it is established. Provide lime and a one-
time fertilizer application.
Vegetation is too short or too Maintain vegetation at an appropriate height.
long.
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.
The inlet device The pipe is clogged. Unclog the pipe. Dispose of the sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to smooth it over and provide erosion
swale. control devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or Remove sediment and replace with clean stone.
covered in sediment (if
applicable).
Forebay or pretreatment Sediment has accumulated to Search for the source of the sediment and remedy the problem if
area a depth of greater than six possible. Remove the sediment and stabilize or dispose of it in a
inches. 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.
Filter bed and underdrain Water is ponding on the Check to see if the collector system is clogged and flush if necessary.
collection system surface for more than 24 If water still ponds, remove the top few inches of filter bed media and
hours after a storm. replace. If water still ponds, then consult an expert.
The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural
damage have occurred at the Resources Regional Office.
outlet.
STORM-EZ 8/23/2019
Version 1.4 O&M Manual Page 7 of 10

Wet Detention Pond Maintenance Requirements
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if
one is provided.
Important maintenance procedures:
_ Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the
basin should be watered twice weekly if needed, until the plants become established (commonly six weeks).
_ No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to
establish the plants on the vegetated shelf.
Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention-
basin.
_ If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the
emergency drain should be minimized to the maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected 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 should be kept in a
known set location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire BMP Trash/debris is present. Remove the trash/debris.
The perimeter of the BMP Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then plant a
erosive gullies have formed. ground cover and water until it is established. Provide lime and a one-
time fertilizer application.
Vegetation is too short or too Maintain vegetation at a height of approximately six inches.
long.
The inlet device The pipe is clogged. Unclog the pipe. Dispose of the sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to smooth it over and provide erosion
swale. control devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or Remove sediment and replace with clean stone.
covered in sediment (if
applicable).
The forebay Sediment has accumulated to Search for the source of the sediment and remedy the problem if
a depth greater than the possible. Remove the sediment and dispose of it in a location where it
original design depth for will not cause impacts to streams or the BMP.
sediment storage.
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.
The vegetated shelf Best professional practices Prune according to best professional practices
show that pruning is needed
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the problem: soils, hydrology, disease, etc.
dying. 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.
Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on
the plants rather than spraying.
STORM-EZ 8/23/2019
Version 1.4 O&M Manual Page 8 of 10

Wet Detention Pond Maintenance Requirements (Continued)
The main treatment area Sediment has accumulated to Search for the source of the sediment and remedy the problem if
a depth greater than the possible. Remove the sediment and dispose of it in a location where it
original design sediment will not cause impacts to streams or the BMP.
storage depth.
Algal growth covers over 50% Consult a professional to remove and control the algal growth.
of the area.
Cattails, phragmites or other Remove the plants by wiping them with pesticide (do not spray).
invasive plants cover 50% of
the basin surface.
The embankment Shrubs have started to grow Remove shrubs immediately.
on the embankment.
Evidence of muskrat or Use traps to remove muskrats and consult a professional to remove
beaver activity is present. beavers.
A tree has started to grow on Consult a dam safety specialist to remove the tree.
the embankment.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. (if applicable)
The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural
damage have occurred at the Resources Regional Office.
outlet.
The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
STORM-EZ 8/23/2019
Version 1.4 O&M Manual Page 9 of 10

Wet Detention Pond Design Summary
Wet Pond Diagram
WET POND ID FOREBAY MAIN POND
BMP#3 Permanent Pool El. 722.5 Permanent Pool El. 722.5
Temporary Pool El: 728.45 Temporary Pool El: 728.45
Pretreatment other Yes Clean Out Depth: 6 Clean Out Depth: - 6
than forebay? Sediment Removal El: 716.5 Sediment Removal El: 716.5
Has Veg. Filter? Yes Bottom Elevation: 716 Bottom Elevation: 716
STORM-EZ 8/23/2019
Version 1.4 O&M Manual Page 10 of 10