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