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III <br /> Preliminary Stormwater Site Plan Everett, WA <br /> I <br /> Maintenance and Operations Requirements <br /> The owner or operator of the project shall be responsible for maintaining the stormwater <br /> facilities in accordance with local requirements. Proper maintenance is important for <br /> 111 adequate functioning of the stormwater facilities. The following maintenance program is <br /> recommended for this project: <br /> I <br /> Frequency Drainage <br /> Maintenance Checklist for Catch Basins and Inlets <br /> Problem Conditions To Check For Conditions That Should Exist <br /> System_ <br /> Feature <br /> M,S General Trash,debris,and Trash or debris in front of the No trash or debris located <br /> I sediment in or on catch basin opening is blocking immediately in front of catch <br /> basin capacity by more than 10%. basin opening. Grate is kept <br /> clean and allows water to <br /> enter. <br /> I M Sediment or debris(in the basin) No sediment or debris in the <br /> that exceeds 1/3 the depth from catch basin. Catch basin is <br /> the bottom of basin to invert of the dug out and clean. <br /> lowest pipe into or out of the <br /> I M,S basin. <br /> Trash or debris in any inlet or pipe Inlet and Outlet pipes free of <br /> blocking more than 1/3 of its trash or debris. <br /> height. <br /> M Structural damage Corner of frame extends more than Frame is even with curb. <br /> to frame and/or top 3A inch past curb face into the <br /> slab street(if applicable). <br /> M Top slab has holes larger than 2 Top slab is free of holes and <br /> square inches or cracks wider than cracks. <br /> I <br /> 1/4 inch(intent is to make sure all <br /> material is running into the basin). <br /> M Frame not sitting flush on top slab, Frame is sitting flush on top <br /> i.e.,separation of more than 3/4 slab. <br /> inch of the frame from the top <br /> slab. <br /> A Cracks in basin Cracks wider than 1/2 inch and Basin replaced or repaired to <br /> walls/bottom longer than 3 feet,any evidence of design standards. Contact a <br /> I <br /> soil particles entering catch basin professional engineer for <br /> through cracks,or maintenance evaluation. <br /> person judges that structure is <br /> unsound. <br /> A Cracks wider than 1/2 inch and No cracks more than 1%inch <br /> I longer than 1 foot at the joint of wide at the joint of <br /> any inlet/outlet pipe or any inlet/outlet pipe. Contact a <br /> evidence of soil particles entering professional engineer for <br /> catch basin through cracks. evaluation. <br /> A Settlement/ Basin has settled more than 1 inch Basin replaced or repaired to <br /> misalignment or has rotated more than 2 inches design standards. Contact a <br /> out of alignment. professional engineer for <br /> evaluation. <br /> M,S Fire hazard of other Presence of chemicals such as No color,odor,or sludge. <br /> I <br /> pollution natural gas,oil,and gasoline. Basin is dug out and clean. <br /> Obnoxious color,odor,or sludge <br /> noted. <br /> M,S Outlet pipe is Vegetation or roots growing in No vegetation or root growth <br /> clogged with inlet/outlet pipe joints that is more present. <br /> vegetation than 6 inches tall and less than 6 <br /> inches apart. <br /> If you are unsure whether a problem exists, please contact a Professional Engineer. <br /> 1 Comments: <br /> A = Annual (March or April, preferred) <br /> I <br /> M = Monthly(see schedule) <br /> S = After major storms (use 1-inch in 24 hours as a guideline) <br /> 111 <br /> PACLAND Job# 50175001 Page 18 <br />