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Sediment removal and cartridge replacement on an as needed 7.Remove safety equipment. <br /> basis is recommended unless site conditions warrant. 8.If appropriate, make notes about the local drainage area <br /> Once an understanding of site characteristics has been relative to ongoing construction, erosion problems, or high <br /> established, maintenance may not be needed for one to three loading of other materials to the system. <br /> years, but inspection is warranted and recommended annually. 9.Discuss conditions that suggest maintenance and make <br /> decision as to weather or not maintenance is needed. <br /> Inspection Procedures Maintenance Decision Tree <br /> The primary goal of an inspection is to assess the condition of The need for maintenance is typically based on results of the <br /> the cartridges relative to the level of visual sediment loading as inspection. The following Maintenance Decision Tree should be used as <br /> it relates to decreased treatment capacity. It may be desirable to a general guide. (Other factors,such as Regulatory Requirements,may <br /> conduct this inspection during a storm to observe the relative need to be considered) <br /> flow through the filter cartridges. If the submerged cartridges <br /> are severely plugged,then typically large amounts of sediments <br /> will be present and very little flow will be discharged from the ' ' "' t <br /> drainage pipes. If this is the case,then maintenance is warranted ?', I� <br /> and the cartridges need to be replaced. <br /> Warning: In the case of a spill,the worker should abort - 3 <br /> inspection activities until the proper guidance is obtained. <br /> Notify the local hazard control agency and CONTECH .. <br /> Construction Products immediately. <br /> To conduct an inspection: <br /> Important: Inspection should be performed by a person who <br /> 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 J�' <br /> surrounding vehicle and pedestrian traffic. <br /> 2.Visually inspect the external condition of the unit and take 1.Sediment loading on the vault floor. <br /> notes concerning defects/problems. a. If>4"of accumulated sediment, maintenance is <br /> required. <br /> " ' to • 2.Sediment loading on top of the cartridge. <br /> a. If>1/4" of accumulation, maintenance is required. <br /> 3.Submerged cartridges. <br /> a. If>4"of static water in the cartridge bay for more <br /> 444 <br /> that 24 hours after end of rain event, maintenance is <br /> required. <br /> y Y <br /> =" ►� 4. Plugged media. <br /> a. If pore space between media granules is absent, <br /> ' ' maintenance is required. <br /> • <br /> 5. Bypass condition. <br /> a. If inspection is conducted during an average rain fall <br /> event and StormFilter remains in bypass condition <br /> x <br /> yT ��,.• <br /> (water over the internal outlet baffle wall or submerged <br /> cartridges), maintenance is required. <br /> 3.Open the access portals to the vault and allow the system vent. 6.Hazardous material release. <br /> 4.Without entering the vault,visually inspect the inside of the a. If hazardous material release(automotive fluids or other) <br /> unit,and note accumulations of liquids and solids. is reported, maintenance is required. <br /> 5. Be sure to record the level of sediment build-up on the floor of 7. Pronounced scum line. <br /> the vault,in the forebay,and on top of the cartridges. If flow a. If pronounced scum line(say >_ 1/4"thick) is present <br /> is occurring, note the flow of water per drainage pipe. Record above top cap, maintenance is required. <br /> all observations, Digital pictures are valuable for historical <br /> documentation. 8.Calendar Lifecycle. <br /> 6.Close and fasten the access portals. a. If system has not been maintained for 3 years <br /> maintenance is required. <br /> 3 <br />