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Home My WebLink AboutSW3221101_O&M Agreement/Plan_20230816 Operation & Maintenance Agreement Project Name: Parkwood Substation Project Location: 5915 Lancaster Highway, Union County, NC 28112 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: 1 Location(s): Lat 34.88806, Long 80.63389 Infiltration Trench Quantity: Location(s): Bioretention Cell Quantity: Location(s): Wet Pond Quantity: Location(s): Stormwater Wetland Quantity: Location(s): Permeable Pavement Quantity: Location(s): Sand Filter Quantity: Location(s): 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: Yes Type: Vegetated swales/roadside ditches 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: Gregory S.Andress Title &Organization: Executive VP and General Mgr, Union Power Cooperative Street address: 1525 N Rocky River Rd. City, state, zip: Monroe, NC 28110 Phone number(s): 704.289.3145 Email: Matt.Baucom@union-power.com Signature: / ----- - — Date: fif I, eqe 5 . Y\omP5O , a Notary Public for the State of NO( CO-( OU c(.- County of Vik(1\U , do hereby certify that G,feriVi S. Vt(-CIV-e-SS personally appeared before me this 10 day of \tA) . - -- , a and acknowledge the due execution of the Operations and Maintenance Agreement . Witness my hand and official seal,09.6a96— ANGEL S. THOMPSON NOTARY PUBLIC Union County State of North Carolina -My Commission Expires December 15,2026 STORM-EZ 8/10/2023 Version 1.5 O&M Agreement Page 1 of 6 Seal My commission expires STORM-EZ 8/10/2023 Version 1.5 O&M Agreement Page 2 of 6 Infiltration Basin Maintenance Requirements Important operation and maintenance procedures: - The drainage area will be carefully managed to reduce the sediment load to the infiltration basin. No portion of the infiltration basin will be fertilized after the initial fertilization that is required to - establish the vegetation. Lime may be allowed if vegetation is planted on the surface of the infiltration basin and a soil test shows that it is needed. - The vegetation in and around the basin will be maintained at a height of four to six inches. After the infiltration basin 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 infiltration basin 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 erosive gullies have cover and water until it is established. Provide lime and a one- The grass filter strip or formed. time fertilizer application. other pretreatment area Sediment has Search for the source of the sediment and remedy the problem accumulated to a depth of if possible. Remove the sediment and dispose of it in a location greater than three inches. where it will not cause impacts to streams or the SCM. The structure is clogged, Unclog the conveyance and dispose of any sediment in a The flow diversion location where it will not cause impacts to streams or the SCM. structure (if applicable) Make any necessary repairs or replace if damage is too much The structure is damaged. for repair. The inlet pipe is clogged (if Unclog the pipe and dispose of any sediment in a location applicable). where it will not cause impacts to streams or the SCM. The inlet pipe is cracked or otherwise damaged (if Repair or replace the pipe. applicable). The inlet device Regrade the swale if necessary and provide erosion control Erosion is occurring in the swale (if applicable). devices such as reinforced turf matting or riprap to avoid future erosion problems. Stone verge is clogged or Remove sediment and clogged stone and replace with clean covered in sediment (if stone. applicable). More than four inches of Search for the source of the sediment and remedy the problem sediment has if possible. Remove the sediment and dispose of it in a location accumulated. where it will not cause impacts to streams or the SCM. Erosion of the basin The basin Provide additional erosion protection such as reinforced turf surface has occurred or matting or riprap if needed to prevent future erosion problems. riprap is displaced. Water is standing more Replace the top few inches of soil to see if this corrects the than three days after a standing water problem. If not, consult an appropriate storm event. professional for a more extensive repair. Infiltration Basin Maintenance Requirements (continued) SCM element: Potential problem: How to remediate the problem: Shrubs or trees are growing on the Remove shrubs and trees immediately. embankment. The embankment An annual inspection by an appropriate professional shows that Make needed repairs immediately. the embankment needs repair. Clogging has occurred. Clean out the outlet device and dispose of 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 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 infiltration basin are causing erosion or Contact the local NCDEQ Regional Office. sedimentation in the receiving water. Low Density Maintenance Requirements Important maintenance procedures: The drainage area to the vegetated conveyance or vegetated receiving area will be carefully managed to reduce the sediment load to the vegetated conveyance or vegetated receiving area. After the initial fertilization to establish the grass in the vegetated conveyance or the vegetated receiving area, fertilizer will not be applied to the vegetated receiving areas. The vegetated conveyance or vegetated receiving area will be inspected quarterly. 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. SCM element: Potential problem: How to remediate the problem: Vegetation is too short or Maintain grassed vegetation such that the swale or vegetated Vegetation too long. area does not erode during the peak flow from the 10-year storm Trash/debris is present. Remove the trash/debris. Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re- Vegetated receiving erosive gullies have sod (or plant with other appropriate species) and water until areas formed. established. Provide lime and a one-time fertilizer application. Trees and/or other woody Remove the trees and woody vegetation from the swale, vegetation are present in regrade the swale if necessary and re-establish grass as the swale. shown on the approved plans. Trash/debris is present. Remove the trash/debris. Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re- erosive gullies have sod (or plant with other appropriate species) and water until formed. established. Provide lime and a one-time fertilizer application. Sediment covers the grass at the bottom of the Remove sediment and dispose in an area that will not impact Vegetated conveyances / swale. streams or SCMs. Re sod if necessary. swales / roadside Regrade the slopes to the permitted configuration per the ditches (other than curb The side slope is steeper than the approved approved plan and reestablish vegetation. If as-built or existing outlet swales) pp conditions do not allow the slopes to be regraded, contact the configuration. applicable permitting agency. Determine the source of the problem: soils, hydrology, Grass is dead, diseased disease, etc. Remedy the problem and replace plants. or dying. Provide a one-time fertilizer application to establish the ground cover if necessary. Trees and/or other woody Remove the trees and woody vegetation from the vegetated vegetation are present in the vegetated conveyance, regrade the vegetated conveyance if necessary conveyance. and re-establish grass as shown on the approved plans. Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site. The outlet device (if applicable) The outlet device is damaged Repair or replace the outlet device. 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 site are causing erosion or Contact the local NCDEQ Regional Office. sedimentation in the receiving water.