Laserfiche WebLink
Table V-4.5.2(5) Maintenance Standards - Catch Basins <br /> Results <br /> Maintenance Conditions When Maintenance is Expected <br /> Defect When Main- <br /> Component Needed <br /> tenance is <br /> performed <br /> No Trash or <br /> debris loc- <br /> Trash or debris which is located imme- ated imme- <br /> diately in front of the catch basin opening or diately in <br /> is blocking inletting capacity of the basin by front of catch <br /> more than 10%. basin or on <br /> Trash or debris (in the basin)that exceeds grate open- <br /> 60 percent of the sump depth as measured ing• <br /> from the bottom of basin to invert of the low- No trash or <br /> est pipe into or out of the basin, but in no debris in the <br /> Trash & case less than a minimum of six inches catch basin. <br /> Debris clearance from the debris surface to the <br /> invert of the lowest pipe. Inlet and out- <br /> let pipes free <br /> Trash or debris in any inlet or outlet pipe of trash or <br /> blocking more than 1/3 of its height. debris. <br /> General Dead animals or vegetation that could gen- No dead <br /> erate odors that could cause complaints or animals or <br /> dangerous gases (e.g., methane). vegetation <br /> present <br /> within the <br /> catch basin. <br /> Sediment(in the basin)that exceeds 60 per- <br /> cent of the sump depth as measured from <br /> the bottom of basin to invert of the lowest <br /> pipe into or out of the basin, but in no case No sediment <br /> Sediment less than a minimum of 6 inches clearance in the catch <br /> from the sediment surface to the invert of the basin <br /> lowest pipe. <br /> Structure Top slab has holes larger than 2 square Top slab is <br /> Damage to inches or cracks wider than 1/4 inch. (Intent free of holes <br /> Frame and/or is to make sure no material is running into and cracks. <br /> Top Slab basin). Frame is sit <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4-Page 838 <br />