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Home My WebLink AboutNCS000429_SCM O&M Plan_20220818O (!A STONI NC Place. People. Promise Municipal Stormwater Control Measures Operation and Maintenance Plan Overview The city of Gastonia owns and operates a variety of properties that are crucial to its day to day operation. The variety of properties range from: • Parks and Recreation Facilities • Gastonia Municipal Airport • Gastonia Police Department • Multiple Gastonia Fire Departments • Fleet Services Garage • The Schiele Museum of Natural History and Planetarium • Municipal Operations Center Each facility has a traditional detention basin which requires periodic maintenance. The following documents show the location of each of the SCMs that are identified on site, and also the method used to maintain these traditional stormwater control measures, as found in the SCM Inspection and Maintenance forms crafted, organized and provided by NC State University. Permit Number: (to be provided by DWQ) Drainage Area Number: Dry Extended Detention Basin 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. The dry extended detention basin system is defined as the dry detention basin, outlet structure, pretreatment including forebays and the vegetated filter if one is provided. This system (check one): ❑ does ❑ does not incorporate a vegetated filter at the outlet. This system (check one): ❑ does ❑ does not incorporate pretreatment other than a forebay. 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. — I will maintain the vegetation in and around the basin at a height of approximately six inches. — Once a year, a dam safety expert will inspect the embankment. After the dry extended detention basin is established, it will be inspected once a quarter 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: Potentialproblem: How I will remediate theproblem: The entire BMP Trash/ debris is present. Remove the trash/ debris. The perimeter of the dry Areas of bare soil and/or Regrade the soil if necessary to extended detention erosive gullies have formed. remove the gully, and then plant a basin ground cover and water until it is established. Provide lime and a one-time fertilizer application. Form SW401-Dry Detention O&M-Rev.3 Page 1 of 4 BMP element: Potentialproblem: How I will remediate theproblem: The inlet device: pipe or The pipe is clogged (if Unclog the pipe. Dispose of the 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. The forebay Sediment has accumulated Search for the source of the and reduced the depth to 75% sediment and remedy the problem if of the original design depth possible. Remove the sediment and (see diagram below). dispose of it in a location where it will not cause impacts to streams or the BMP. Erosion has occurred or Provide additional erosion riprap is displaced. protection such as reinforced turf matting or riprap if needed to revent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticides are used, wipe them on the plants rather than spraying. The main treatment area Sediment has accumulated Search for the source of the and reduced the depth to 75% sediment and remedy the problem if of the original design depth possible. Remove the sediment and (see diagram below). dispose of it in a location where it will not cause impacts to streams or the BMP. Revegetate disturbed areas immediately with sod (preferred) or seed protected with securely staked erosion mat. Water is standing more than Check outlet structure for clogging. 5 days after a storm event. If it is a design issue, consult an appropriate rofessional. Weeds and noxious plants are Remove the plants by hand or by growing in the main wiping them with pesticide (do not treatment area. spray). Form SW401-Dry Detention O&M-Rev.3 Page 2 of 4 BMP element: Potentialproblem: How I will remediate theproblem: The embankment Shrubs or trees have started Remove shrubs or trees to grow on the embankment. immediately. Grass cover is unhealthy or Restore the health of the grass cover eroding. - consult a professional if necessary. Signs of seepage on the Consult a professional. downstream face. Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove 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 NC Division of Water damage have occurred at the Quality 401 Oversight Unit at 919- outlet. 733-1786. 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. When the basin depth reads When the basin depth reads Sediment Removal feet in the main pond, the sediment shall be removed. feet in the forebay, the sediment shall be removed. BASIN DIAGRAM ill in the blanks) --------------T- m plue, Bottom Elevatioi 25 /o Sediment Storage FOREBAY Temporary Pool Elevation Pool emP D ora Sediment Removal Elevation Volume Bottom Elevation 1 25% MAIN POND Form SW401-Dry Detention O&M-Rev.3 Page 3 of 4 Permit Number: (to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name: BMP drainage area number: Print name: Title: Address: Phone: Signature: 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. I, , a Notary Public for the State of County of , do hereby certify that personally appeared before me this day of , and acknowledge the due execution of the forgoing dry detention basin maintenance requirements. Witness my hand and official seal, SEAL My commission expires Form SW401-Dry Detention O&M-Rev.3 Page 4 of 4 POND ID STREET STREET # POND TYPI BASIN MAPNO ADDRESS 10 BROAD ST 1300 CITY POND LONG 1769 1300 N BROAD ST 4 12 BROAD ST 600 CITY POND LONG 1645 600 N BROAD ST 17 CARSON RI 0 CITY POND CROWDERS 700-28 CARSON RD/ADIRONDAK DR 89 GARRISON 632 CITY POND CATAWBA 5048 632 E GARRISON BLVD 89 GARRISON 632 CITY POND CATAWBA 5048 632 E GARRISON BLVD 90 GASTON D 1126 CITY POND CROWDERS 501-240 1126 GASTON DAY SCHOOL RD 91 GASTON T1 1106 CITY POND LONG 5065 1109 GASTON TECHNOLOGY PKWY 1071 HUDSON B 900 CITY POND CROWDERS 1383 900 W HUDSON BLVD 120 LONG AVE 200 CITY POND LONG 107A-27 200 E LONG AVE 122 LONG AVE 410 CITY POND LONG 3940 410 E LONG AVE 140 NEAL HAW 1515 CITY POND CROWDERS 3563 1515 NEAL HAWKINS RD 2 383 MYRTLE SC 260 CITY POND CROWDERS 3909 260 N MYRTLE SCHOOL RD 462 ARMSTROr 900 CITY POND CATAWBA 3906 900 ARMSTRONG PARK RD 476 CARSON RI 613 CITY POND CROWDERS 3907 613 CARSON RD 493 DUKE ST 3175 CITY POND CATAWBA 6798 3175 DUKE ST 521 GARRISON 1500 CITY POND CATAWBA 2505 1500 E GARRISON BLVD 528 GASTON D 3811 CITY POND CATAWBA 2866 3811 GASTON DAY SCHOOL RD 535 WHITENER 299 CITY POND CROWDERS 300-143 299 WHITENER ST 549 MILLSTONI 2851 CITY POND DUHARTS 4228 2851 MILLSTONE DR 582 PRYOR ST 913 CITY POND LONG 2463 913 PRYOR ST 601 WELLONS 1 717 CITY POND CATAWBA 500-219 717 WELLONS DR 654 GARRISON 1500 CITY POND CATAWBA 7195 1500 E GARRISON BLVD 725 BROAD ST 1300 CITY POND LONG 82a-19 1300 N BROAD ST 4 726 BROAD ST 1300 CITY PONDI LONG 82a-19 1300 N BROAD ST 4 7271 BROAD ST 1300 CITY PONDI LONG I N/A 11300 N BROAD ST 4 7331 NEAL HAW 1515 CITY POND CROWDERS 13563 11515 NEAL HAWKINS RD 2