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No. 5—Catch Basins <br /> Maintenance Defect Conditions When Mainlenanceis Needed Results Expected When <br /> Component Maintenance is <br /> performed <br /> General T2sh 8 Trash or debris which is iocated immediately No Trash or debris located <br /> Debris in hont of the catch basin opening or is immediately in fronl of <br /> blorhing inletling capacity of the basin hy catch basin or on grate <br /> more lhan 70%. opening. <br /> Trash or debris(in the basin)that exceeds 60 No t2sh or de6ris in lhE <br /> percent of the sump depth as measured from catch basin. <br /> ihe bodom o(basin to invert o(ihe lowest <br /> pipe into or oul of the basin,6ut in no case <br /> less than a minimum of six inches clearance <br /> from the debris suAace to lhe i�vert of ihe <br /> lowest pipe. <br /> Trash or debris in any inlet or outlet pipe Inlel and outlet pipes free <br /> blocking more Ihan 1!3 of its height. of irash or debris. <br /> Dead animals or vegetation lhat could No dead animals or <br /> generate odors that couid cause complainls vegetalion present wi�hin <br /> or dangerous gases(e.g.,melhane). �he wtch basin. <br /> SedimeM Sedimenl(in ihe basin)Ihat exceeds 60 No sediment in the catch <br /> percent of the sump depth as measured from basin <br /> ihe bottom ot basin�o invert of the lowesl <br /> pipe inlo or out of lhe basin,bul in no rase <br /> less than a minimum of 6 inches Gearance <br /> from the sediment suriace to lhe invert of the <br /> lowest pipe. <br /> Slructure Top slab has holes larger than 2 square Top slab is tree of holes <br /> Damage to inches or uacks wider lhan 7/4 inch and cracks. <br /> Frame and/or <br /> Top Slab (Intent is lo make sure no material is running <br /> into basin). <br /> Frame not sitling flush on top slab,i.e., Frame is sitting flush on <br /> separation of more than 3l4 inch of lhe frame lhc nser rinqs or top slab <br /> from�he top slab. Frame not securely and firmly aqached. <br /> atlached <br /> Fractures or Maii .enance person judges�hat structure is Basin replaced or repaired <br /> Cracks in unsocnd. to design slandards. <br /> Basin Wails/ <br /> Bottom <br /> Grout fillet has separaled or cracked wider Pipe is regrouled and <br /> ihan 12 inch and longer than 1 tool at ihe secure at basin wall. <br /> joinl of any inleVoullet pipe or any evidence of <br /> soil particles entering catch basin through <br /> cracks. <br /> SettlemenU If failure of basin has created a safety, Basin repiaced or repaired <br /> Misalignment function,or design problem. to design standards. <br /> Vegetation Vegetation growing across and blockmg more No vegetation blocking <br /> than 10%of the basin opening. opening lo basin. <br /> Vegetation growing in inleVoutlet pipe joints No vegetalion or root <br /> that is more than six inches tall and less than growlh presenl. <br /> six inches�part. <br /> 4-36 Volume V-Runoll Treatment BMPs February 2005 <br />