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Everett LDS Parking Lot Expansion <br />Storm Drainage Report <br />Storm Convevance and Detention System Maintenance <br />NO.3 - CLOSED DETENTION SYSTEMS (PIPES/TANKS) <br />Maintenance Defect <br />Conditions When Maintenance is Needed <br />Results Expected When <br />Component <br />Maintenance is Performed <br />Storage Area Plugged Air Vents <br />One-half of the cross section of a vent is blocked at <br />Vents free of debris and <br />any point with debris and sediment <br />sediment <br />Debris and <br />Accumulated sediment depth exceeds 10% of the <br />All sediment and debris <br />Sediment <br />diameter of the storage area for % length of storage <br />removed from storage area. <br />vamt or any point depth exceeds 15% of diameter. <br />Example: 72-inch storage tank would require cleaning <br />when sediment reaches depth of 7 inches for more <br />than % length of tank. <br />Joints BeNjeen <br />Any crack allowing material to be transported into <br />All joint between tank /pipe <br />Tank/Pipe Section <br />facility <br />sections are sealed <br />Tank Pipe Bent Out <br />Any part of tank/pipe is bent out of shape more than <br />Tank/ pipe repaired or replaced <br />of Shape <br />10% of it's design shape <br />to design. <br />Manhole Cover Not in Place <br />Cover is missing or only oartially in place. Any open <br />Manhole is closed. <br />manhole requires maintenance. <br />Locking <br />Mechanism cannot be opened by one maintenance <br />Mechanism opens with proper <br />Mechanism Not <br />person with proper tools. Bolts into frame have less <br />tools. <br />Working <br />than %'nch of thread (may not apply to self-locking <br />lids.) <br />Cover Difficult to <br />One maintenance person cannot remove lid after <br />Cover can be removed and <br />Remove <br />apr- ;ring 80lbs of lift. Intent is to keep cover from <br />reinstalled by one maintenance <br />sealing off access to maintenance <br />person. <br />Ladder Rungs <br />King County Safety Office and/or maintenance person <br />Ladder nieets design standards <br />Unsafe <br />judges that ladder is unsafe due to missing rungs, <br />allows maintenance person safe <br />misalignment, rust, or cracks. <br />access. <br />Catch Basins <br />See "Catch Basins' Standards No. 5 <br />See "Catch Basins' Standards <br />No. 5 <br />P:12006106113 Everett Los Parkin, LOnTexnstorm Reports106113 Drainage Report Revertant 01.10.09.doc Page 30 of 36 <br />