9600 SHARON DR EXPLORER MIDDLE SCHOOL 2016-05-27

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