Loading...
HomeMy WebLinkAboutSW5120201_O&M Agreement_20120315Permit Number: S WS/2c��/ (to he prouidcd by DIVQ) Drainage Area Number: Bioretention Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will 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 removal efficiency of the BMP. Important operation and maintenance procedures: — Immediately after the bioretention cell is established, the plants will be watered twice weekly if needed until the plants become established (commonly six weeks). - Snow, mulch or any other material will NEVER be piled on the surface of the bioretention cell. Heavy equipment will NEVER be driven over the bioretention cell. Special care will be taken to prevent sediment from entering the bioretention cell. Once a year, a soil test of the soil media will be conducted. After the bioretention cell is established, I will inspect it 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 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 roblems: How l will remediate the roblem: The entire BMP Trash/debris is present. Remove the trash/debris. The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to bioretention cell erosive gullies have formed, remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the stone verge or swale applicable). sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged (if applicable). Erosion is occurring in the Regrade the swale if necessary to swale (if applicable). smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Stone verge is clogged or Remove sediment and clogged covered in sediment (if stone and replace with clean stone. applicable). Form SW401-Bioretention O&M-Rev.3 Page 1 of4 BMP element: The pretreatment area The bioretention cell: vegetation The bioretention cell: soils and mulch Potential problems: Plow is bypassing pretreatment area and/or gullies have formed. Sediment has accumulated to a depth greater than three inches. Erosion has occurred Weeds are present. Best professional practices show that pruning is needed to maintain optimal plant health. Plants are dead, diseased or dying. Tree stakes/wires are present six months after planting. Mulch is breaking down or has floated away. Soils and/or mulch are clogged with sediment. An annual soil test shows that pH has dropped or heavy metals have accumulated in the soil media. How I will remediate the problem: Regrade if necessary to route all flow to the pretreatment area. Restabilize the area after grading. Search for the source of the sediment and remedy the problem if possible. Remove the sediment and restabilize the pretreatment area. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Remove the weeds, preferably by hand. Prune according to best professional practices. Determine the source of the problem: soils, hydrology, disease, etc. 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. Remove tree stake/ wires (which can kill the tree if not removed). Spot mulch if there are only random void areas. Replace whole mulch layer if necessary. Remove the remaining much and replace with triple shredded hard wood mulch at a'maximum depth of three inches. Determine the extent of the clogging - remove and replace either just the top layers or the entire media as needed. Dispose of the spoil in an appropriate off -site location. Use triple shredded hard wood mulch at a maximum depth of three inches. Search for the source of the sediment and remedy the problem if possible. _ Dolomitic lime shall be applied as recommended per the soil test and toxic soils shall be removed, disposed of properly and replaced with new pIanting media. Form SW401-Bioretention O&M-Rev.3 Page 2 of 4 BMP element: Potentialproblems: How I will remediate theproblem: The underdrain system Clogging has occurred. Wash out the underdrain system, if applicable) The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of the sediment off -site. The drop inlet is damaged Repair or replace the drop inlet. The receiving water Erosion or other signs of Contact the NC Division of Water damage have occurred at the Quality 401 Oversight Unit at 9"19- outlet. 733-1786. Form SW40 I -Bioretention O&M-Rev.3 ["age 3 of 4 Permit Number: SW51 7-0 Za 1 Oo he provided by DIVQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. 1 agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name. -Dollar General - Spring Hope BA41' drainage area nun7her Print name:Georj�,e T. Barnes. Jr. Title:member-m Address:' 900 Merton Drive. Suite 210 Raleiah. NC 27609 Phon+ Signa Date: Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. 1, d /E"i/J/1/N zk/- c= xi , a Notary Public for the State of IK)J r"N Q9xd ,y19 , County of W(z&16;r �, do hereby certify that ar (o eF /7,P�1/F�Sa i� personally appeared before me this day of &� zZlAkfs , o.),/)zd , and acknowledge the due execution of the forgoing bioretention maintenance requirements. Witness my hand and official seal, .``%I�'PNN N 8s100 N w y "UBOG �Q� V SEAL My commission expires '2-10-4a/G Form SW401-Bioretention I&M-Rev. 2 Page 4 of 4