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( . <br /> I <br /> No. 5—Catch Basins <br /> i <br /> � Maintenance Detect Conditions When Maintenance is Needed Results Expected When <br /> � Component Maintenance is <br /> performed <br /> I� General Trash 8 Trash or debns which is lor.ated immediately No Trash or debris located <br /> Debris in front of the catch basin opening or is immediately in froM of <br /> blocking inletting capaciry ot the basin by catch basln or on grale <br /> I more ihan 10%. openina, <br /> Trash nr debris(in the basin)that exceeds 60 No trash or debris in the <br /> percent of the sump depth as measured trom catch basin. <br /> the bottom o(basin to invert of the lowest <br /> I pipe into or out of the basin, but in no case <br /> less than a minimwn of six inches clearance <br /> Gom Ihe debris surface to the invert of the <br /> lowest pipe. <br /> � Tresh or debris in any inlet or outlet pipe Inlet and outlet pipes free <br /> blocking more than 1/3 of ils height. of lrash or de6ris. <br /> Dead animals or vegetation lhat could No dead animals or <br /> I genera�e odors that could cause complaints vegelation present wilhin <br /> or dangerous gases(e.g., methane). the catch basin. <br /> Sedimenl Sedimenl(in ihe�asin)thal exceeds 60 No seAiment in ihe catch <br /> L percent of lhe sump deplh as measured(rom basin <br /> ( the botlom of basin lo imert of the lowest <br /> pipe in�o or out ot lhe basin, bul in no case <br /> Iess lhan a minimum of 6 inches clearance <br /> from Ihe sediment suRace lo the invert of the <br /> � lowest pipe. <br /> � <br /> Slruclure Top slab has holes larger lhan 2 square Top slab is free of holes <br /> I Damage lo inches or cracks wider Ihan 1!4 inch and cracks. <br /> Frame and/or <br /> Top Slab (Inlent is lo make sure no material is running <br /> into basin). <br /> ( Frame nol sit�ing flush on top slab, i.e., Frame is silting flush on <br /> � separalion of more lhan 3/4 inch of the(rame �he nser nngs or top slab <br /> fmm lhe top sla6. Frame not securely and firmly attached. <br /> ; attached <br /> � Fractures or Maintenance person judges thal structure is Basin replaced or repaired <br /> Cracks in unsound. lo design standards. <br /> Basin Walls/ <br /> j Bottom <br /> Grout fillel has separated or cracked wider Pipe is regrouted and <br /> than 1/2 inch and longer than 1 toot at the secure at basin wall. <br /> joint of any in�eUoutlet pipe or any evidence of <br /> soil partides entering catch basin through <br /> cracks. <br /> Seltlement/ If failure o(basin has created a safety, Basin replaced or repaired <br /> Misalignment (unction,or design prohlem. to design standards. <br /> Vegetation Vegetation growing across and blocking more No vegetation blocking <br /> than 109b o(Ihe basin opening, opening to basin. <br /> Vegetation growing in inleUouUet pipe joinls No vegetation or root <br /> that is more than six indies tall and less than growlh present. <br /> six inches apart. <br /> ' Zb <br /> i 4-56 Volume V—RunoNTreatment E3MPs August 2001 <br />