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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> Oab <br /> Qrslnage <br /> Syatem Malntenr.nce Aetivitlee and Condltlons <br /> Frequency Feature � � ✓ � Problem Condltlons to Check�or 7hat Should EKist <br /> M Manhole/ Trasy and Dabns Trash or debns(in the basin)thet ezceeds 6� No trash or debns in the catch basin. <br /> Chamber parcent oi tbe sump depth as measured hom <br /> the bottom of basin to invert of the lowest pipe <br /> into or out of the basin,but in no�ase less lhan <br /> a minimum of 6 inches clearance hom the debris <br /> surface ta the invert of the loweet pipe. <br /> M Manholel Trash and Dehris Trash or debris in any inlet or outlet pipe Inlet and outlet pipes free of tresh or debris. <br /> Chamber blodcing more then orw-MiM of its height. <br /> M Menholel Trasb and Debns DeeC animels or vegetetion t�et could generate No deaG animals or vegetation present withi� <br /> Chamber odors that could cauae compleints ar dangeious the catch basin. <br /> gases(e.g.,methane,. <br /> M Manhalel Sedimenl Sediment(in the basin)that exceeds 60 percent No se0iment In the catch basin. <br /> Chamber ol tha sump depth as measured fram <br /> � the botlom of basin to invert of the lowest pipe <br /> into or out of Me besin, but in no case less lhan <br /> a minimum of 8 Inches dearance hom the <br /> sediment sur(ace ro the invert of the lowest pipe. <br /> A Manholei Structure Damnge Top slab has holes larger than 2 square inches Top slab Is free o!holes and cracks. <br /> Chamber lo Frame and/or or cracks wider than one-fourth inch(intent is ta <br /> Top Slab meke sure no material is running inlo basin). <br /> A Manholel Strudure Demagn Frame nol sitting flush on tap slab,i.e., Frame is sitting flush on the riser rings or top <br /> Chamber to Frame and/or separation oi more Ihan three-fourth inch of the slab and firmly atlached. <br /> Top Slab freme from the top slab.Freme not securely <br /> attacF�ed <br /> A Manholel Fradures or Cracks Maintenance person jutlges that strudure is Besin replaced or repaired to design <br /> Cham6er in Basin Wallsl unsound. slandards. <br /> Bottom <br /> A Manholel Fradures or Grout fillet has separated or r,r,cRed wider than Pipe is reyrouled antl secure at basin wall. <br /> Chamber Cracks in Basin one�elf•inch end longer than 1 i�+ot at the joint <br /> Wallsl Bottom of any inleVouUel pipe or any evidance c�f soil <br /> particles entenng catch basin thmugh c�adcs. � <br /> Appendices <br /> F-19 <br /> , •--. <br />