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HomeMy WebLinkAboutSW3220301_O&M Agreement/Plan_20220420Operation & Maintenance Agreement Mini Storage USA, Inc - Mini Warehouse Project Wingate, NC UNION County Prepared By: Kevin E. Herring PE, Kevin E. Herring Engineering MM Maintenance records Mat he kept on the foilowing BMP(s). This maintenance record shag be kept in a in a known set kx etion. 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 & Bioretention Cell Quantity: Dry Detention Basin Quantity: Grassed Swale Quantity: Green Roof Quantity: Infiltration Basin Quantity: Infiltration Trench Quantity: Level SpreaderNFS Quantity: Permeable Pavement Quantity: Proprietary System Quantity: Rainwater Harvesting Quantity: Sand Filter Quantity: Stor nwater Wetland Quantity: Wet Detention Basin Quantity: Disconnected Impervious Area Present: Soll Amendments Present: 101i 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: Signature: Daniel H. Jordan - -- Preaklent, Mini Storap USA, Inc 4724 Old Monrce•Marahvllle Rd MaratnrlHe, NC 28103 7"1,8619 Dan ATIPI-1199mall.com , a Notary Public for the State of _ do hearby certify that `�& iC- L L ' -J rn. County of ��r1 t �i-� -- —t— before me this 4 — day of -, Y:U . �and personally appeared acknowledge the due execution of the Operations and LAainten n Agreement. Witness my hand and official seal, -- ELIZABETH B HE ER Notary Public Union Co., North Carol a y Commission Expires Feb. 6, 2023 My commission expires h 4 1 Date: Yti �-- 12/2=21 3TOWA-EZ O&M Manual Page 1 of 1 Version 1.4 Sand Filter Maintenance Requirements Important operation and maintenance procedures: - Manage the drainage area to reduce the sediment load to the sand filter. - Clean out the sedimentation chamber or forebay whenever sediment depth exceeds six inches. - 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. 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: Entire sand filter Trash/debris is present. Remove the trash/debris. Adjacent pavement (if Sediment is present on the Sweep or vacuum the sediment as soon as possible. applicable) pavement surface. 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 perimeter of the sand formed. time fertilizer application. filter Vegetation is too short or Maintain vegetation at an appropriate height. too long. The structure is clogged. Unclog the structure and dispose of sediment in a location where The flow diversion it will not cause impacts to streams or the SCM. The structure is damaged. Make any necessary repairs or replace if the damage is too much structure (if applicable) for repair. The inlet pipe is clogged (if Unclog the pipe and dispose of sediment in a location where it will applicable). not cause impacts to streams or the SCM. The inlet pipe is cracked or otherwise damaged (if Repair or replace the pipe. applicable). Erosion is occurring in the Regrade the swale if necessary and provide erosion control The inlet device devices such as reinforced turf matting or riprap to avoid future swale (if applicable). problems with erosion. Stone verge is clogged or Remove sediment and clogged stone and replace with clean covered in sediment (if stone. applicable). Sediment has accumulated Search for the source of the sediment and remedy the problem if to a depth of greater than possible. Remove the sediment and dispose of it in a location six inches. where it will not cause impacts to streams or the SCM. Sediment chamber (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 a pesticide is used, wipe it on the plants rather than spraying. Sand Filter Maintenance Reauirements (continued) SCM element: Potential problem: How to remediate the problem: Sand chamber and Water is ponding on the Check to see if the collector system is clogged and flush if underdrain collection surface for more than 24 necessary. If water still ponds, remove the top few inches of filter system hours after a storm. bed media and replace. If water still ponds, then consult an appropriate professional. Clogging has occurred. gg g Clean out the outlet device and dispose of 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. Erosion or other signs of damage have occurred at Repair the damage and improve the flow dissipation structure. the outlet. Discharges from the sand The receiving water filter are causing erosion or Contact the local NCDEQ Regional Office. sedimentation in the receiving water.