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Silver Lake Plaza Table V-4.5.2(3) Maintenance Standards - Closed Detention Systems (Tanks/Vaults) (continued) Results Expec Maintenance Conditions When Maintenance is ted When Component Defect Needed Maintenance is Performed Mechanism cannot be opened by one Locking Mech- maintenance person with proper tools. Mechanism anism Not Work- Bolts into frame have less than 112 inch opens with ing of thread (may not apply to self-locking proper tools. lids). Cover can be One maintenance person cannot removed and Cover Difficult to remove lid after applying normal lifting reinstalled by Remove pressure. Intent is to keep cover from one main - sealing off access to maintenance. tenance per- son. Ladder meets design stand - Ladder is Ladder is unsafe due to missing rungs, ards. Allows Unsafe misalignment, not securely attached to maintenance structure wall, rust, or cracks. person safe access. Catch Basins See" Catch Bas- See' Catch Basins' (No. 5). See "Catch Basins" (No. 5). ins" (No. 5) Table V-4.5.2(4) Maintenance Standards - Control Structure/Flow Restrictor Maintenance Component Defect Condition When Main- tenance is Needed Results Expected When Maintenance is Performed Trash and Material exceeds 25% of Control structure orifice is not Debris sump depth or 1 foot below blocked. All trash and debris (Includes orifice plate. removed. Sediment) General Structure is not securely Structure securely attached to attached to manhole wall. wall and outlet pipe. Structural Structure is not in upright Structure in correct position. Damage position (allow up to 10% Connections to outlet pipe are from plumb). watertight; structure repaired Connections to outlet pipe or replaced and works as 2014 Stormwater Management Manual for Western Washington Volume V - Chapter 4 - Page 836 WESTERN ENGINEERS, INC. 35 PROJECT: 15-1415-A