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14 <br /> Maintenance Decision Tree <br /> The need for maintenance is typically based on results of the <br /> inspection. The following Maintenance Decision Tree should be used as <br /> J a general guide.(Other factors,such as Regulatory Requirements, may <br /> =.;. need to be considered) <br /> 1. Sediment loading on the vault floor. <br /> a. If >4"of accumulated sediment, maintenance is <br /> req u i red. <br /> 2. Sediment loading on top of the cartridge. <br /> a. If >1/4"of accumulation, maintenance is required. <br /> 3. Submerged cartridges. <br /> :44. a. If >4"of static water above cartridge bottom for more <br /> than 24 hours after end of rain event, maintenance <br /> • is required. (Catch basins have standing water in the <br /> cartridge bay.) <br /> Inspection Procedures <br /> 4. Plugged media. <br /> The primary goal of an inspection is to assess the condition of a. If pore space between media granules is absent, <br /> the 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 inspection 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 during an average rain fall <br /> are severely plugged,then typically large amounts of sediments event and StormFilter 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 is required. <br /> and the cartridges need to be replaced. <br /> 6. Hazardous material release. <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 is 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 ? 1/4"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 /> StormFilter treatment unit. <br /> 1. If applicable, set up safety equipment to protect and notify <br /> surrounding vehicle and pedestrian traffic. <br /> 2. Visually inspect the external condition of the unit and take f <br /> notes concerning defects/problems. "4 <br /> 3. Open the access portals to the vault and allow the system <br /> vent. <br /> 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 <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. <br /> 7. Remove safety equipment. <br /> 8. If appropriate, make notes about the local drainage area <br /> relative to ongoing construction, erosion problems, or high <br /> loading of other materials to the system. <br /> 9. Discuss conditions that suggest maintenance and make <br /> decision as to weather or not maintenance is needed. <br />