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HomeMy WebLinkAboutSW6210503_O&M Agreement Form_20210518Operation & Maintenance Agreement Project Name: Project Location: Townsend Eastates Townsend Road, Hoke County, North Carolina 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 & cc Infiltration Basin Quantity: Infiltration Trench Quantity: Bioretention Cell Quantity: Wet Pond Stormwater Wetland Permeable Pavement Sand Filter Rainwater Harvesting Green Roof Level Spreader - Filter Strip Proprietary System Treatment Swale Dry Pond Disconnected Impervious Surface User Defined SCM Low Density Quantity: Quantity: Quantity: Quantity: Quantity: Quantity: Quantity: Quantity: Quantity: Quantity: Present: Present: Present: 'resoonair g O&M sheets will Location(s): Location(s): Location(s): Location(s): Location(s): Location(s): Location(s): Location(s): Location(s): Location(s): Location(s): Location(s): Location(s): Location(s): Location(s): Type: ae aaaea automaticai INoth side of site I 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: Title & Organization: Street address: City, state, zip: Phone number(s): Email: Signature County of personally appeared before me this Mubarak Shahbain Manager - Raeford Development Company, LLC 645 Laurinburg Highway Raeford, NC 28376 910-638-6102 jamal@jandkbuilders.com , a Notary Public for the State of , do hereby certify that day of acknowledge the due execution of the Operations and Maintenance Agreement . Witness my hand and official seal, Date: and Seal STORM-EZ Version 1.5 My commission expires O&M Agreement 5/18/2021 Page 1 of 1 Wet Pond Maintenance Requirements Important operation and 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 pond should be fertilized after the initial fertilization that is required to establish the plants on the vegetated shelf. Stable groundcover will be maintained in the drainage area to reduce the sediment load to the wet pond. If the pond must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain will be minimized as much as possible. At least once annually, a dam safety expert will inspect the embankment. Any problems that are found will be repaired immediately. 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 wet pond is established, it 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 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 wet pond 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 erosive gullies have cover and water until it is established. Provide lime and a one - wet pond formed. time fertilizer application. The inlet pipe is clogged applicable). (ifThe Unclog the pipe. Dispose of the sediment off -site. inlet pipe is cracked or otherwise damaged (if Repair or replace the pipe. The inlet device applicable). Regrade the swale if necessary and provide erosion control Erosion is occurring in the devices such as reinforced turf matting or riprap to avoid swale (if applicable). future problems with erosion. 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 depth for sediment location where it will not cause impacts to streams or the SCM storage. The forebay Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Remove the weeds, preferably by hand. If pesticide is used, Weeds are present. wipe it on the plants rather than spraying. 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 Algal growth covers over area 50% of the area. Consult a professional to remove and control the algal growth. p g Cattails, phragmites or other invasive plants Remove the plants by wiping them with pesticide (do not cover 50% of the basin spray). surface. Best professional practices show that pruning is needed to Prune according to best professional practices. maintain optimal plant health. Determine the source of the problem: soils, hydrology, The vegetated shelf Plants are dead, diseased disease, etc. Remedy the problem and replace plants. Provid or dying. a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Remove the weeds, preferably by hand. If pesticide is used, Weeds are present. 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 Consult a dam safety specialist to remove the tree. grow on the embankment. An annual inspection by an appropriate professional shows that Make all needed repairs immediately. the embankment needs repair. Clogging has occurred. gg g Clean out the outlet device and dispose of any sediment in a location where it will not cause impacts to streams or the SCM The outlet device The outlet device is damaged. Repair or replace the outlet device. Weeds or volunteer trees are growing on the mat. Remove the weeds or trees. Floating wetland island (if applicable) The anchor cable is damaged, disconnected Restore the anchor cable to its design state. or missing. Wet Pond Maintenance Requirements (Continued) SCM element: Potential problem: How to remediate the problem: 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 wet pond are causing erosion Contact the local NCDEQ Regional Office. or sedimentation in the receiving water. Wet Detention Pond Design Summary Wet Pond Diagram WET POND ID 1 Pretreatment No other than Has Veg. Filter? FOREBAY Permanent Pool El. 205.5 Temporary Pool El: 207.5 Clean Out Depth: 4.5 Sediment Removal E 201 Bottom Elevation: 199.7 ATTACH ADDITIONAL SHEETS IF NECESSARY MAIN POND Permanent Pool El. 205.5 Temporary Pool El: 207.5 Clean Out Depth: 4.5 Sediment Removal E 201 Bottom Elevation: 200