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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Wet Ponds <br /> Date <br /> Drainage <br /> System Maintenance Activities and Conditions <br /> Frequency Feature ✓ ✓ ✓ ✓ Problem Conditions to Check For That Should Exist <br /> M General Water level First cell is empty, doesn't hold water. Line the first cell to maintain at least 4 feet of <br /> water.Although the second cell may drain, <br /> the first cell must remain full to control <br /> turbulence of the incoming flow and reduce <br /> sediment resuspension. <br /> M Trash and Debris Accumulation that exceeds 1 cubic foot per Trash and debris removed from pond <br /> 1000 square feet of pond area. <br /> M Inlet/Outlet Pipe Inlet/Outlet pipe clogged with sediment and/or No clogging or blockage in the inlet and <br /> debris material outlet piping. <br /> M Sediment Sediment accumulations in pond bottom that Sediment removed from pond bottom. (If <br /> Accumulation in exceeds the depth of sediment zone plus 6 sediment contamination is a potential <br /> Pond Bottom inches, usually in the first cell. problem, sediment should be tested regularly <br /> to determine leaching potential prior to <br /> disposal.) <br /> M Oil Sheen on Water Prevalent and visible oil sheen. Oil removed from water using oil-absorbent <br /> pads or vactor truck. Source of oil located <br /> and corrected. If chronic low levels of oil <br /> persist, plant wetland plants such as Juncus <br /> effusus (soft rush)which can uptake small <br /> concentrations of oil. <br /> A Erosion Erosion of the pond's side slopes and/or Slopes stabilized using proper erosion control <br /> scouring of the pond bottom that exceeds 6 measures and repair methods. <br /> inches, or where continued erosion is <br /> prevalent. <br /> A Settlement of Pond Any part of these components that has settled 4 Dike/berm is repaired to specifications <br /> Dike/Berm inches or lower than the design elevation, or <br /> inspector determines dike/berm is unsound. <br /> A Internal Berm Berm dividing cells should be level. Berm surface is leveled so that water flows <br /> evenly over entire length of berm. <br /> Appendices <br /> F-25 <br />