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NMI =II MN NMI EN 111111 — iI NM I <br /> CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Catch Basins <br /> Date <br /> Drainage <br /> System Maintenance Activities and Conditions <br /> Frequency Feature ✓ ✓ ✓ I Problem Conditions to Check For That Should Exist <br /> A General "Dump no Stencil or stamp should be visible and easily Warning signs(e.g.,"Dump No Waste-Drains <br /> pollutants"Stencil read to Stream")shall be painted or embossed on <br /> or stamp not visible or adjacent to all storm drain inlets. <br /> M,S General Trash and Debris Trash or debris which is located immediately in No trash or debris located immediately in <br /> front of the catch basin opening or is blocking front of catch basin or on grate opening. <br /> inletting capacity of the basin by more than 10 <br /> percent. <br /> M General Trash and Debris Trash or debris(in the basin)that exceeds 60 No trash or debris in the catch basin. <br /> percent of the sump depth as measured from <br /> the bottom of basin to invert of the lowest pipe <br /> into or out of the basin, but in no case less than <br /> a minimum of 6 inches clearance from the debris <br /> surface to the invert of the lowest pipe. <br /> M General Trash and Debris Trash or debris in any inlet or outlet pipe Inlet and outlet pipes free of trash or debris. <br /> blocking more than one-third of its height. <br /> M General Trash and Debris Dead animals or vegetation that could generate No dead animals or vegetation present within <br /> odors that could cause complaints or dangerous the catch basin. <br /> gases(e.g., methane). <br /> M General Sediment Sediment(in the basin)that exceeds 60 percent No sediment in the catch basin <br /> of the sump depth as measured from the bottom <br /> of basin to invert of the lowest pipe into or out of <br /> the basin, but in no case less than a minimum of <br /> 6 inches clearance from the sediment surface to <br /> the invert of the lowest pipe. <br /> A General Structure Damage Top slab has holes larger than 2 square inches Top slab is free of holes and cracks. <br /> to Frame and/or or cracks wider than one-fourth inch(intent is to <br /> Top Slab make sure no material is running into basin). <br /> Appendices <br /> F-14 <br />