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HomeMy WebLinkAboutSW5200602_O&M Agreement_20200622Project Name: Wake Electric Project Location: 228 Park Ave Youngsville, Franklin County, NC 27596 Maintenance records shall be Kept on the following t4Mt'(S). I hIS 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 &comes 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: Stormwater Wetland Quantity: Wet Detention Basin Quantity: Disconnected Impervious Area Present: User Defined BMP Present: onding O&M tables wil 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): 2 1 0 No No I be adtled automaticall and 1, and 2 and 1-southeast corner of ro'ect site 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. Signature: Responsible Party: Title &Organization: Street address: City, state, zip: Phone number(s): Email: Chris Wright Manager of Engineering 228 Park Ave. Youngsville, NC 27596 979-863-6385 919.418-5709 Chris.Wrig ht@wemc.com ����. �, !'ir���gn � , a Notary Public for the State of County of in/.4kE , do hearby certify that �R/J kJR/6lfi personally appeared before me this D r day of �%I/NE and acknowledge the due execution of the Operations nd Maint once Agreement . Witness my_ official seal, y aLXBt►� �Ta9y .«» Version 1.4 My commission expires /�" '•/ice ` �02 f � siaizo2o Page 1 of 6 Important maintenance procedures - The drainage area will be managed to reduce the sediment load to the dry extended detention basin. - Immediately after the dry extended detention basin is established, the vegetation will be watered twice weekly if needed until the plants become established (commonly six weeks). - No portion of the dry extended detention pond will be fertilized after the first initial fertilization that is required to establish the vegetation. The vegetation in and around the basin will be maintained at a height of approximately six inches. If cracks, seepage, or woody vegetation is present, consult a dam safety expert for a dam inspection. 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 dry detention basin is established, it will be inspected quarterly. Inspection activities shall be performed as follows and any problems identified will be remediated immediately per the table below. BMP element: Potential problem: How to remediate the problem: The entire BMP Trash/debris is present. Remove the trash/debris. The perimeter of the BMP Areas of bare soil and/or Regrade the soil if 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 Regrade the swale if necessary to smooth it over and provide erosion Swale. control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Stone verge is clogged or Remove sediment and replace with clean stone. covered in sediment (if applicable). The forebay Trash/debris is present. Remove the trash/debris. Erosion has occurred or Provide additional erosion protection such as reinforced turf matting or riprap is displaced. riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticides are used, wipe them on the plants rather than spraying. STORM-EZ 6/8/2020 Version 1.4 O&M Manual Page 3 of 6 BMP element: Potential problem: How to remediate the problem: The main treatment area Sediment has accumulated Search for the source of the sediment and remedy the problem if and reduced the depth to 75 % possible. Remove the sediment and dispose of it in a location where it of the original design depth will not cause impacts to streams or the BMP. Revegetate disturbed (per pond design data sheet) areas immediately with sod (preferred) or seed protected with securely staked erosion mat. Water is standing more than Check outlet structure for clogging. If it is a design issue, consult an 5 days after a storm event. appropriate professional. Weeds and noxious plants Remove the plants by hand or by wiping them with pesticide (do not are growing in the main spray). treatment area. The embankment Shrubs or trees have started Remove shrubs or trees immediately. to grow on the embankment. Grass cover is unhealthy or Restore the health of the grass cover — consult a professional if eroding. necessary. Signs of seepage on the Consult a professional. downstream face. Evidence of muskrat or Use traps to remove muskrats and consult a professional to remove beaver activity is present. beavers. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off -site. The outlet device is damaged 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. STORM-EZ 6/8/2020 Version 1.4 O&M Manual Page 4 of 6 Dry Detention Pond Design Summary_ Pretreatment Has Vag. Filler Pretreatment Has Vag. Filler Temporary Pool El: Clean Out Depth: Yes Sediment Storage EI: No Bottom Elevation: Temporary Pool EI: Clean Out Depth: Yes Sediment Storage EI: No Bottom Elevation: 442 2 444 442 442 2 444 442 Temporary Pool El: Clean Out Depth: Sediment Storage El: Bottom Elevation: Temporary Pool EI: Clean Out Depth: Sediment Storage EI: Bottom Elevation: 442 1.5 443.5 442 442 1.7 443.7 442 STORM-EZ 6/8/2020 Version 1.4 O&M Manual Page 5 of 6 Sand Filter Maintenance Requirements Important maintenance procedures: - The drainage area will be carefully managed to reduce the sediment load to the sand filter. The sedimentation chamber or forebay will be cleaned out whenever sediment depth exceeds six inches. Once a year, sand media will be skimmed. The sand filter media will be replaced whenever it fails to function properly after maintenance. The sand filter shall 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 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. BMP element: Potential problem: How to remediate the problem; Entire BMP 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. Perimeter of sand filter Areas of bare soil and/or Regrade the soil if 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 an appropriate height. long. Flow diversion structure The structure is clogged. Unclog the conveyance and dispose of any sediment offsite. The structure is damaged. Make any necessary repairs or replace if damage is too large for repair. 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 Regrade the swale if necessary to smooth it over and provide erosion swale. control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Stone verge is clogged or Remove sediment and replace with clean stone. covered in sediment (if applicable). Forebay or pretreatment Sediment has accumulated to Search for the source of the sediment and remedy the problem if area a depth of greater than six possible. Remove the sediment and stabilize or dispose of it in a inches. location where it will not cause impacts to streams or the BMP. 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. Filter bed and underdrain Water is pending on the Check to see if the collector system is clogged and flush if necessary. collection system surface for more than 24 If water still ponds, remove the top few inches of filter bed media and hours after a storm. replace. If water still ponds, then consult an expert. The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off -site. The outlet device is damaged 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. STORM-EZ 6/6/2020 Version 1.4 O&M Manual Page 6 of 6