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HomeMy WebLinkAboutSigned O&MOperation & Maintenance Agreement Project Name: DaVita Spencer Project Location: Spencer NC Cover Page Maintenance records shall be kept on the following BMP(s). This maintenance record shall be kept in a log in a known set location. Any deficient BMP 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 BMP(s). The BMP(s) on this project include (check all that apply & corresponding O&M tables wi Bioretention Cell Quantity: Location(s): Dry Detention Basin Quantity: Loostion(s): Grassed Swale Quantity: Location(s): Green Roof Quantity: Location(s): Infiltration Basin Quantity: Location(s): Infiltration Trench Quantity: Location(s): Level SpreaderNFS Quantity: Location(s): Permeable Pavement Quantity: Location(s): Proprietary System Quantity: Location(s): Rainwater Harvesting Quantity: Location(s): Sand Filter Quantity: Location(s): Stormwater Wetland Quantity: Location(s): Wet Detention Basin Quantityl 1 Location(s): Disconnected Impervious Area Present:l No Location(s): User Defined BMP Present:l No Location(s): I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed for each BMP above, and attached O&M tables. I agree to notify NCDENR 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: Mr. Robert Langdon RHGC Spencer, LLC 223 Hwy 70 East Pointe, Suite 100 Gamer NC 27529 919.662.1001 riangdon@langdoncpa.com Signa � v Date: (�.J J / / a Notary Public for the State of AA h County of f 4� do hearty ce/pftity that /� &4 4.17 W� personally appeared before me this .'i day of ,LIe e a4)/7 and acknowledge the due execution of the ons and Mainttee/nnaa osAgreement. Witness my -hand and official seal, expires 11--26-17 822017 Page 1 of 5 Wet Detention Pond Maintenance Requirements The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. Important 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 detention pond should be fertilized after the first initial fertilization that is required to establish the plants on the vegetated shelf. _ Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. - Once a year, a dam safety expert should inspect the embankment. After the wet detention pond is established, it should be inspected once a month 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 should be kept in a known set location and must be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potential problem: How I will remediate the problem: The entire BMP Trash/debris is present. Remove the trash/debris. The perimeter of the BMP Areas of bare soil andlor Regrade the soil it necessary to remove the gully, and then plant a erosive gullies have formed. ground cover and water until it is established. Provide lime and a one- time fertilizer application. Vegetation is too short or too Maintain vegetation at a height of approximately six inches. long. The inlet device The pipe is clogged. Unclog the pipe. Dispose of the sediment off-site. The pipe is cracked or Replace the pipe. otherwise damaged. Erosion is occurring in the Regmde the swale if necessary to smooth it over and provide erosion swale. control devices such as reinforced turf matting or dprap to avoid future problems with erosion. Stone verge is clogged or Remove sediment and replace with clean stone. covered in sediment (d applicable). The forebay Sediment has accumulated to Search for the source of the sediment and remedy the problem if a depth greater than the possible. Remove the sediment and dispose of it in a location where if original design depth for will not cause impacts to streams or the BMP. sediment storage. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprep if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it o the plants rather than spraying. The vegetated shelf Best professional practices Prune according to best professional practices show that pruning is needed to maintain optimal plant health. Plants are dead, diseased or Determine the source of the problem: soils, hydrology, disease, etc. dying. Remedy the problem and replace plants. Provide 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. STORM -EZ 822011 Version 1.4 O&M Manual Page 3 of 5 Wet Detention Pond Maintenance Requirements (Continued) The main treatment area Sediment has accumulated to Search for the source of the sediment and remedy the problem if a depth greater than the possible. Remove the sediment and dispose of it in a location where it original design sediment will not cause impacts to streams or the BMP. storage depth. Algal growth covers over 50% Consult a professional to remove and control the algal growth. of the area. Cattails, phragmhes or other Remove the plants by wiping them with pesticide (do not spray). invasive plants cover 50% of the basin surface. The embankment Shrubs have started to grow Remove shrubs immediately. on the embankment. Evidence of muskrat or Use traps to remove muskrats and consult a professional to remove beaver activity is present. beavers. A tree has started to grow on Consult a dam safety specialist to remove the tree. the embankment. An annual inspection by an Make all needed repairs, appropriate professional shows that the embankment needs repair. (if applicable) The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site. The outlet device is d ilaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural damage have occurred at the Resources Regional Office. outlet. 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. ;TORM-FS 822017 Jemion 1.4 O&M Manual Page 4 of 5 Wet Detention Pond Design Summary STORM -EZ 82/2017 Jersion 1.4 08M Manual Page 5 of 5 We[ Pontl Diagram WET POND ID FOREBAY MAIN POND Wat Pond No 1 Permanent Pool EI. 735.5 Permanent Pool EI. Temporary Pool EI: 737.75 Temporary Pool EI: Pretreatment other No Clean Out Depth: 4.5 Clean Out Depth: M7331 than forebay7 Sediment Removal El: 732 Sediment Removal EI: Has Vag. Filter? No Bottom Elevation: 731 Bottom Elevation: STORM -EZ 82/2017 Jersion 1.4 08M Manual Page 5 of 5