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HomeMy WebLinkAboutSW3230605_O&M Agreement/Plan_20231011 Operation & Maintenance Agreement Project Name: Rogers Pond Project Location: Old Waxhaw Monroe Rd, Waxhaw, NC 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: Location(s): _ Infiltration Trench Quantity: Location(s): Bioretention Cell Quantity: Location(s): _ Wet Pond Quantity: 2 Location(s): central-eastern and southeastern part of sit Stormwater Wetland Quantity: Location(s): _ Permeable Pavement Quantity: Location(s): Sand Filter Quantity: 1 Location(s): northeast portion of site Rainwater Harvesting Quantity: Location(s): _ Green Roof Quantity: Location(s): _ Level Spreader- Filter Strip Quantity: Location(s): Proprietary System Quantity: Location(s): Treatment Swale Quantity: Location(s): Dry Pond Quantity: 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: John Brunner Title & Organization: Vice President of Land Development, SDH Charlotte LLC Street address: 4297 NC Highway 24/27 E, Suite B City, state, zip: Midland, NC 28107 Phone number(s): 704-575-7328 C)Aet) Email: jjbrunner@smithdouglas.com Signature: ( Date: yJ`ZDj I, RcXCQ, �oath/ , , a Notary Public for the State of I'\Cç(\ Nitno\ County of \ jfn10-)n , do hereby certify that T6h4 13YU0nc,l - personally appeared before me this MiAll day of MaO, and acknowledge the due execution of the 0 erations and Maintenance Agreement . Witness my hand and official seal, ?KA fl Man hit . Rachel Tomlin NOTARY PUBLIC Union County North Carolina My Commission Expires Jul/28,2027 Seal My commission expires 111 9' i a)aq STORM-EZ 3/15/2023 Version 1.5 O&M Agreement Page 1 of 7 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. 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. 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 ^I-* Pond Diagram WET POND ID FOREBAY MAIN POND 1 Permanent Pool El. 632.5 Permanent Pool El. 632.5 Temporary Pool El: 633.93 Temporary Pool El: 633.93 Pretreatment other Clean Out Depth: 5.5 Clean Out Depth: 5.5 than forebay? No Sediment Removal El 627 Sediment Removal El 627 Has Veg. Filter? Bottom Elevation: 626.5 Bottom Elevation: 626.5 WET POND ID FOREBAY MAIN POND 2 Permanent Pool El. 594.5 Permanent Pool El. 594.5 Temporary Pool El: 595.99 Temporary Pool El: 595.99 Pretreatment other Clean Out Depth: 5.5 Clean Out Depth: 5.5 than forebay? No Sediment Removal El 589 Sediment Removal El 589 Has Veg. Filter? Bottom Elevation: 588.5 Bottom Elevation: 588.5 ATTACH ADDITIONAL SHEETS IF NECESSARY Sand Filter Maintenance Requirements Important operation and maintenance procedures - Manage the drainage area to reduce the sediment load to the sand filter. I�ICd1I VUL LIIC JCUIIIICIILdLIVI I UIId111UCl UI IVICUdy WIICIICVCI JCUIIIICIIL Ut )LII CAUCCUJ - At least once a year, skim the sand media - Replace the sand filter media whenever it fails to function properly after maintenance. After the sand filter is established, it 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 shall be kept in a known set location and shall be available upon request. ,ection activities shall be performed as follows. Any problems that are found shall be repaired immediately. SCM element: Potential problem: How to remediate the problem: Entire sand filter I IdJII�uCL,11J lb Remove the trash/debris. Adjacent pavement Sediment is present Sweep or vacuum the sediment as soon as possible. (if applicable) on the pavement Areas of bare soil Regrade the soil if necessary to remove the gully, and/or erosive gullies plant ground cover and water until it is established. The perimeter of the have formed. Provide lime and a one-time fertilizer application. sand filter Vegetation is too short or too long. Maintain vegetation at an appropriate height. The structure is Unclog the structure and dispose of sediment in a The flow diversion clogged. location where it will not cause impacts to streams or structure (if applicable) The structure is Make any necessary repairs or replace if the damage damaged. is too much for repair. The inlet pipe is Unclog the pipe and dispose of sediment in a location clogged (if where it will not cause impacts to streams or the SCM. I He II IICL cracked or otherwise damaged (if Repair or replace the pipe. annlirahlcl The inlet device Erosion is occurring in Regrade the swale if necessary and provide erosion the swale (if control devices such as reinforced turf matting or applicable). riprap to avoid future problems with erosion. JLVIIC VCILye lb clogged or covered in Remove sediment and clogged stone and replace sediment (if with clean stone. annlirahlcl Sediment has Search for the source of the sediment and remedy the accumulated to a problem if possible. Remove the sediment and depth of greater than dispose of it in a location where it will not cause six inches. impacts to streams or the SCM. Sediment chamber Provide additional erosion protection such as (forebay) Erosion has occurred. reinforced turf matting or riprap if needed to prevent future erosion problems. Remove the weeds, preferably by hand. If a pesticide Weeds are present. is used, wipe it on the plants rather than spraying. Sand Filter Maintenance Requirements (continued) SCM element: Potential problem: How to remediate the problem: Water is ponding on Check to see if the collector system is clogged and Sand chamber and the surface for more flush if necessary. If water still ponds, remove the top underdrain collection system than 24 hours after a few inches of filter bed media and replace. If water storm. still ponds, then consult an appropriate professional. Clogging has Clean out the outlet device and dispose of sediment in a location where it will not cause impacts to occurred. The outlet device streams or the SCM. The outlet device is Repair or replace the outlet device. damaged. Erosion or other signs Repair the damage and improve the flow dissipation of damage have occurred at the outlet. structure. The receiving water Discharges from the sand filter are causing erosion or Contact the local NCDEQ Regional Office. sedimentation in the receiving water.