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Wet Detention Basin <br /> Location : PIN 9864-39-4358 <br /> The wet detention basin system is defined as the wet detention basin, preAreatment including forebays and the vegetated filter if one is <br /> provided. <br /> These systems do not incorporate vegetated filters at the outlets . <br /> These systems do not incorporate pre-treatment other than a forebays . <br /> Important maintenance procedures : <br /> • Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin shall be <br /> watered twice weekly if needed, until the plants become established (commonly 6 weeks) . <br /> • No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to establish the <br /> plants on the vegetated shelf. <br /> • Stable groundcover shall be maintained in the drainage area to reduce the sediment load to the wet detention basin . <br /> • If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency <br /> drain shall be minimized to the maximum extent practical . <br /> • Once a year, a dam safety expert shall inspect the embankment. <br /> After the wet detention pond is established, it shall be inspected once a month and within 24 hours after every storm event greater <br /> than 1 . 0 inches . Records of operation and maintenance shall be kept in a known set location on the project site and shall be made <br /> available upon request . <br /> Inspection activities shall be performed as follows . Any problems that are found shall be repaired immediately . <br /> SCM Element : Potential Problem : How Property Owner Will Remediate the <br /> Problem . <br /> The Entire SCM Trash/Debris is present. Remove the trash/debris <br /> The Perimeter of the Wet Areas of bare soil and/or erosive gullies Re-grade the soil if necessary to remove the <br /> Detention Basin have formed . gully, and then plant a ground cover and water <br /> until it is established. Provide lime and a one- <br /> time fertilizer application , <br /> Vegetation is too short or too long . Maintain vegetation at a height of <br /> approximately 6 inches . <br /> The Inlet Device : Pipe or Swale The pipe is clogged. Unclog the pipe . Dispose of the sediment off- <br /> site . <br /> The pipe is cracked or otherwise Replace the pipe , <br /> damaged, <br /> Erosion is occurring in the swale . Re-grade the swale if necessary to smooth it <br /> over and provide erosion control devices such <br /> as reinforced turf matting or riprap to avoid <br /> future problems with erosion . <br /> The Forebay Sediment has accumulated to a depth Search for the source of the sediment and <br /> greater than the original design depth for remedy the problem if possible . Remove the <br /> sediment storage (see diagrams below) . sediment and dispose of it in a location where it <br /> will not cause impacts to streams or the SCM . <br /> Erosion has occurred. Provide additional erosion protection such as <br /> reinforced turf matting or riprap if needed to <br /> revent future erosion problems . <br /> Weeds are present . Remove the weeds , preferably by hand. If <br /> cattails or other weeds become invasive and <br /> pesticide application is necessary, have a <br /> licensed aquatic pesticide applicator treat the <br /> weeds by wiping aquatic glyphosate on the <br /> leaves rather than spraying , <br /> Page 2 of 4 <br />