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I <br /> INTER WEST—EVERETT CONTRACTOR'S YARD SITE IMPROVEMENTS Sitts & Hill Engineers, Inc. <br /> I <br /> OPERATION AND MAINTENANCE MANUAL Job Number 18,831 <br /> I <br /> - ' _ - Maintenance Decision Tree <br /> � °' The need for maintenance is type.,I:bases on results of the <br /> • <br /> :4011 <br /> inspection. The following Maintera•ice Decision Tree should be used as <br /> i... -ter:1S,+ a general guide.(Other factors,sLcl'as Regulatory Requirements,may <br /> I <br /> * , need to be cons cored) <br /> +. '� �• 1. Sediment loading on the vau t Poor. <br /> K ,� 0 rw* �' ;"C~ 4`: a. I= :--4"of accumulated sediment,maintenance is <br /> _ • I, 2. Sediment loading on top of trio cartridge. <br /> .. �--.- _ i1 a. If>1!4"of accumulation,maintenance is required. <br /> �r..` - 3. Submerged cartridges <br /> ..t <br /> a. If:>4-of static water above cart,dge bottom for more <br /> t' than 24 hours after end of rain event,maintenance <br /> a <br /> Inspection Procedures. • is required.(Catch basins have standing water in the <br /> I <br /> ' `•' -N" ' . ,' -- cartridge bay.) <br /> 4. Plugged media <br /> The primary goal of an inspection is to assess the condition of a. If pore soace between media granules is aosent, <br /> I <br /> cartridges relative to the level of visual sediment loading as maintenance is required. <br /> it relates to decreased treatment capacity.It may be desirable to <br /> conduct this inscection during a storm to observe the relative 5. Bypass condition <br /> flow through the filter cartridges.If the submerged cartridges a. If inspection is conducted dunng an average rain fail <br /> I are severely plugged,then typically large amounts of sediments event and StorrnFilter remains in bypass condition <br /> will be present and very little flow will be discharged from the (water over the internal outlet baffle wall or submerged <br /> drainage pipes. If this is the case,then maintenance is warranted cartridges),maintenance s required. <br /> and the cartridges need to be replaced. <br /> 6. Hazardous mater al release <br /> I <br /> Warning In the case of a spill,the worker should abort a. If hazardous material release(automotive fluids or other) <br /> inspection activities until the proper guidance is obtained, is reported,maintenance s required. <br /> Notify the local hazard control agency and Contech Engineered <br /> Solutions immediately. 7. Pronounced scum line. <br /> To conduct an inspection: a. If pronounced scum line(say= '/4"thick)is present <br /> above top cap,maintenance is required. <br /> Important:Inspection should be performed by a person <br /> who is familiar with the operation and configuration of the <br /> I StormFilter treatment unit. <br /> I. If applicable,set up safety equipment to protect and notify <br /> surrounding vehicle and pedestrian traffic. __ <br /> I <br /> 2. Visually inspect the external condition of the unit and take . <br /> notes concerning defects/problems. a <br /> tothesystem ' <br /> 3. Open the access portals vault and allow the vent. , <br /> I 4. Without entering the vault,visually inspect the inside of the - , <br /> unit,and note accumulations of liquids and solids. <br /> 5. Be sure to record the level of sediment build-up on the floor - <br /> of the vault,in the forebay,and on top of the cartridges.If i <br /> ' flow is occurring,note the flow of water per drainage pipe. <br /> Record all observations.Digital pictures are valuable for <br /> historical documentation. <br /> 6. Close and fasten the access portals. 'sue :' <br /> Aikpi <br /> I 7. Remove safety equipment. <br /> 8. If appropriate,make notes about the local drainage area i. <br /> relative to ongo-rig construction,erosion problems,or high <br /> loading of other materials to the system. <br /> I 9. Discuss conditions that suggest maintenance and make <br /> decision as to weather or not maintenance is needed_ <br /> 3 <br /> I <br /> SITTS& HILL ENGINEERS, INC. 21 <br /> ITACOMA, WASHINGTON <br />