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HomeMy WebLinkAboutSW4210702_O&M Agreement/Plan_20210729Operation & Maintenance Agreement Project Name: Southern Alamance Aigh School Additions and Renovations Project Location:1631 Southern High School Road 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 & cor Infiltration Basin Quantity: Infiltration Trench Quantity: Bioretention Cell Quantity: Wet Pond Quantity: Stormwater Wetland Quantity: Permeable Pavement Quantity: Sand Filter Quantity: Rainwater Harvesting Quantity: Green Roof Quantity: Level Spreader - Filter Strip Quantity: Proprietary System Quantity: Treatment Swale Quantity: Dry Pond Quantity: Disconnected Impervious Surface Present: User Defined SCM Present: Low Density Present: 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 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: Facilities County of Y �` personally appeared before me this (1 k12.nc.us , a Notary , do hereb! - day of acknowledge the due execution of the Operations and Maintenance Agreement Witness my hand and official seal, Q&. Sue F. Longe Notary Publi Randolph Coun North Carolin Sea! My commission expires Q Z0 2d 2 STORM. EZ 726/202 Version 1 5 O&M Agreement Page 1 of Wet Pond _Aaintenance R, ,equiirements.. 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 dram 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 1.6 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 erosive gullies have cover and water until it is established. Provide lime and a one - pond 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 Provide additional erosion protection such as reinforced turf Erosion has occurred. 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 (Cont nueoj 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 /o- of the area. Cattails, phragmites or other invasive plants cover Remove the plants by wiping them with pesticide (do not 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. 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. are growing on the mat. a Floating wetland island The anchor cable is (if applicable) damaged, disconnected or Restore the anchor cable to its design state missing. Wet' Pond_ Maintenance Re ulrements 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. Discharges from the wet The receiving water pond are causing erosion Contact the local NCDEQ Regional Office or sedimentation in the receiving water. Wet _Detention Pond Mtign Summary m WET POND ID Pond 1 Pretreatment other No than forebay? Has Vag. Filter? Yes Permanent Pool El. 604 Temporary Pool El: 605.5 Clean Out Depth: 4 Sediment Removal E 600 Bottom Elevation: 599 Permanent Pool El. 604 Temporary Pool El: 605.5. Clean Out Depth: 4 Sediment Removal E 600 Bottom Elevation: 599