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Silver Lake Plaza <br />Minimum Requirement # 8: Wetland Protection <br />No known wetlands exist within the general area of the site or between the site and the <br />closest downstream receiving water (Silver Lake). <br />Minimum Requirement # 9: Operation and Maintenance <br />Table V-4.5.2(3) Maintenance Standards - Closed Detention Systems <br />(Tanks/Vaults) <br />Results Expec <br />Maintenance <br />Conditions When Maintenance is <br />ted When <br />Component <br />Defect <br />Needed <br />Maintenance <br />is Performed <br />Plugged Air <br />One-half of the cross section of a vent <br />Vents open and <br />Vents <br />is blocked at any point or the vent is <br />functioning. <br />damaged. <br />Accumulated sediment depth exceeds <br />10% of the diameter of the storage area <br />for 1/2 length of storage vault or any <br />All sediment <br />Debris and Sed- <br />point depth exceeds 15% of diameter. <br />and debris <br />iment <br />(Example: 72-inch storage tank would <br />removed from <br />require cleaning when sediment <br />storage area. <br />reaches depth of 7 inches for more than <br />1/2 length of tank.) <br />Any openings or voids allowing mater- <br />All joint <br />Joints Between <br />ial to be transported into facility. <br />between <br />Storage Area <br />Tank/Pipe Sec- <br />tank/pipe sec- <br />tion <br />(Will require engineering analysis to <br />tions are <br />determine structural stability). <br />sealed. <br />Any part of tank/pipe is bent out of <br />Tank/pipe <br />Tank Pipe Bent <br />shape more than 10% of its design <br />repaired or <br />Out of Shape <br />shape. (Review required by engineer to <br />replaced to <br />determine structural stability). <br />design. <br />Vault replaced <br />Cracks wider than 1/2-inch and any <br />or repaired to <br />evidence of soil particles entering the <br />design spe- <br />deldesii <br />Vault Structure <br />structure through the cracks, or main- <br />tions and <br />Includes Cracks <br />tenance/inspection personnel determ- <br />is ci structurally <br />in Wall, Bottom, <br />ines that the vault is not structurally <br />sound. <br />Damage to <br />sound. <br />No cracks more <br />Frame and/or <br />Cracks wider than 1/2-inch atthe joint <br />than 1/4-inch <br />Top Slab <br />of any inletloutlet pipe or any evidence <br />wide at the joint <br />of soil particles entering the vault <br />of the inletlout- <br />through the walls. <br />let pipe. <br />Manhole <br />Cover Not in <br />Cover is missing or only partially in <br />Manhole is <br />place. Any open manhole requires <br />closed. <br />Place <br />maintenance. <br />2014 Stormwater Management Manual for Western Washington <br />Volume V - Chapter 4 - Page 835 <br />WESTERN ENGINEERS, INC. 34 PROJECT: 15-1415-A <br />