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Silver Lake Plaza Table V-4.5.2(5) Maintenance Standards - Catch Basins (continued) Results Maintenance Defect Conditions When Maintenance is Expected When Main - Component Needed tenance is performed Frame not sitting flush on top slab, i.e., sep- ting flush on the riser rings aration of more than 3/4 inch of the frame or top slab from the top slab. Frame not securely and firmly attached attached. Basin Maintenance person judges that structure is replaced or unsound. repaired to Fractures or Grout fillet has separated or cracked wider design stand - Cracks in Basin Walls/ than 1 /2 inch and longer than 1 foot at the ards. Bottom joint of any inlet/outlet pipe orany evidence Pipe is of soil particles entering catch basin through regrouted cracks. and secure at basin wall. Basin Settlement/ If failure of basin has created a safety, func- replaced or repaired todesign Misalignment tion, or design problem. stand- ards. No veget- ation block - Vegetation growing across and blocking more than 10% of the basin opening. ing opening to basin. Vegetation Vegetation growing in inlet/outlet pipe joints No veget- that is more than six inches tall and less ation or root than six inches apart growth present. Contamination See "Detention Ponds" (No. 1). No pollution and Pollution present. Cover is missing or only partially in place. Catch basin Cover Not in Any open catch basin requires main- cover is Catch Basin Place tenance. closed Cover Locking Mech- Mechanism cannot be opened by one main- Mechanism anism Not tenance person with propertools. Bolts into opens with 2014 Stormwater Management Manua! for Western Washington Volume V - Chapter 4 - Page 839 WESTERN ENGINEERS, INC. 38 PROJECT: 15-1415-A