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Home My WebLink AboutSW6210905_O&M Agreement/Plan_20210927[W%'OUAU'W:bFJd11 OVAUP1 ORmaraiowingbUIVI(s). .nce record shall be kept in log in:a known set locatl Any def.icient,:SC.M elements noted in the inspectio will'be:c . :: .. � I. .. n o.ftc.ted-, repa red, or replaced: immediately. Thes deficiencies can affect theintegrity of structures',S8 . .. 1. repaired, - .. I immediately. _p deficiencies ..fetyQf the publia, andthwpollutant rernovate efficiency of the.SOM(g), T"e':5CM1s1 on this: project include (oheqk:aII:that :a Infiltration. Basin lnfllt.atlon. Trench sioretention C611 Wet Pond StormwaterMetland Peftneabli Pavement Sand Filter Rainwater Harvesting. Green Roof: navel: Spreader - Filter: Strip Proprietary System TreatmerTt Swale :Dry Pond Disconnected Impervious Surface User Defined SCM Low bensity. I acknowledge and. agree by my signature. below that I am responsible for the performance. of the maintenanceprocedures listed for each SCM above, and attAdh6d O&M t0ibles. I i6qr6e: to notify: NCDFO: ofany:problems: withthe system or prior to any changes to :the system:or responsible: party: .......... .................. .......... 4 ........ -... Title & City , Y, Phone r Si Date; Date: .M_JY I Notary Public fbi: the State: of 4, County of. d. IWI"\ daheireby certify that : Personally appeared before me this day of before .. .. .. . and acknowledge the due execution of Operations and Maintenance A greemen Witness My Jgwd«aoo official: seal, ............ 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. The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground pond erosive gullies have cover and water until it is established. Provide lime and a one - formed. time fertilizer application. The inlet pipe is clogged Unclog the pipe. Dispose of the sediment off -site. (if applicable). The inlet pipe is cracked or otherwise damaged (if Repair or replace the pipe. The inlet device applicable). Erosion is occurring in the Regrade the swale if necessary and provide erosion control swale (if applicable). devices such as reinforced turf matting or riprap to avoid 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. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, 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. Algal growth covers over Consult a professional to remove and control the algal growth. The main treatment area 50% of the area. Cattails, phragmites or Remove the plants by wiping them with pesticide (do not other invasive plants cover spray). 50% of the basin 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. 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. A tree has started to grow Consult a dam safety specialist to remove the tree. The embankment 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 Repair or replace the outlet device. damaged. Weeds or volunteer trees Remove the weeds or trees. a re 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. 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 ► in+. Pond Diagran FOREBAY MAIN POND WET POND ID WET POND 1 Pretreatment other No than forebay? Has Veg. Filter? No Permanent Pool El. 264.5 Temporary Pool El: 266 Clean Out Depth: 4.5 Sediment Removal El 260 Bottom Elevation: 260 ATTACH ADDITIONAL SHEETS IF NECESSARY Permanent Pool El. 264.5 Temporary Pool El: 266 Clean Out Depth: 4.5 Sediment Removal El 260 Bottom Elevation: 260