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Verizon Communications-Stormwater Site Plan Everett,WA <br /> X. Maintenance and Operation Requirements <br /> Proper maintenance is important for adequate functioning of the stormwater facilities. The <br /> following maintenance program is recommended for this project: <br /> NO. 1 — CATCH BASINS <br /> Maintenance Defect or Problem Conditions When Maintenance is Needed Results Expected When <br /> Component Maintenance is performed <br /> General Trash&Debris Trash or debris of more than 1/2 cubic foot which No Trash or debris located <br /> (Includes Sediment) is located immediately in front of the catch basin immediately in front of catch basin <br /> opening or is blocking capacity of the basin by opening. <br /> more than 10% <br /> Trash or debris(in the basin)that exceeds 1/3 the No trash or debris in the catch basin. <br /> depth from the bottom of basin to invert the <br /> lowest pipe into or out of the basin. <br /> Trash or debris in any inlet or outlet pipe blocking Inlet and outlet pipes free of trash or <br /> more than 1/3 of its height. debris. <br /> Dead animals or vegetation that could generate No dead animals or vegetation <br /> odors that could cause complaints or dangerous present within the catch basin. <br /> gases(e.g.,methane). <br /> Deposits of garbage exceeding 1 cubic foot in No condition present which would <br /> volume. attract or support the breeding of <br /> insects or rodents. <br /> Structure Damage to Corner of frame extends more than% inch past Frame is even with curb. <br /> Frame'and/or Top curb face into the street(If applicable). <br /> Slab <br /> Top slab has holes larger than 2 square inches Top slab is free of holes and cracks. <br /> or cracks wider than '/a inch(intent is to make <br /> sure all material is running into basin). <br /> Frame not sitting flush on top slab,i.e.,separation Frame is sitting flush on top slab. <br /> of more than 3/4 inch of the frame from the top <br /> slab. <br /> Cracks in Basin Cracks wider than inch and longer than 3 feet, Basin replaced or repaired to design <br /> Walls/Bottom any evidence of soil particles entering catch basin standards. <br /> through cracks,or maintenance person judges that <br /> structure is unsound. <br /> Cracks wider than'/ inch and longer than 1 foot at No cracks more than r inch wide at <br /> the joint of any inlet/outlet pipe or any evidence of the joint of inlet/outlet pipe. <br /> soil particles entering catch basin through cracks. <br /> Settlement/ Basin has settled more than 1 inch or has rotated Basin replaced or repaired to design <br /> Misalignment more than 2 inches out of alignment. standards. <br /> Fire Hazard Presence of chemicals such as natural gas,oil and No flammable chemicals present. <br /> gasoline. <br /> Vegetation Vegetation growing across and blocking more than No vegetation blocking opening to <br /> 10%of the basin opening. basin. <br /> Vegetation growing in inlet/outlet pipe joints that is No vegetation or root growth present. <br /> more than 6 inches tall and less than 6 inches <br /> apart. <br /> PACLAND Job#50183001 Page 26 <br />