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A properly functioning system will remove The recommended initial frequency for <br /> solids from water by trapping particulates in inspection /minor maintenance is two times <br /> the porous structure of the filter media. The per year for precast units. StormFilter units <br /> flow through the system will naturally should be inspected after all major storms. <br /> decrease as more and more solids are Sediment removal and cartridge <br /> trapped. Eventually the flow through the replacement on an annual basis is <br /> system will be low enough to require recommended until further knowledge is <br /> replacement of the cartridges. It may be gained about a particular system. <br /> possible to extend the usable span of the <br /> cartridges by removing sediment from Once an understanding of site <br /> upstream trapping devices on an as- needed characteristics has been established, <br /> basis in order to prevent material from being maintenance may not be needed for one to <br /> re- suspended and discharged to the two years, but inspection is warranted. <br /> system. <br /> Maintenance Methods <br /> Site conditions greatly influence <br /> maintenance requirements. StormFilter Inspection /Minor Maintenance <br /> units located in areas with erosion or active <br /> construction should be inspected and The primary goal of a maintenance <br /> maintained more often than those in fully inspection is to assess the condition of the <br /> stabilized areas. cartridges relative to the level of sediment <br /> loading. It may be desirable to conduct this <br /> The maintenance frequency may be inspection during a storm to observe the <br /> adjusted as additional monitoring relative flow through the filter cartridges. If <br /> information becomes available during the the submerged cartridges are severely <br /> inspection program. Areas that develop plugged, large amounts of sediments will be <br /> known problems should be inspected more present and very little flow will be <br /> frequently than areas that demonstrate no discharged from the drainage pipes. If this <br /> problems, particularly after large storms. is the case, it is likely that the cartridges <br /> need to be replaced. <br /> Ultimately, inspection and maintenance <br /> activities should be scheduled based on the Warning: In the case of a spill, the worker <br /> historic records and characteristics of an should abort maintenance activities until the <br /> individual StormFilter system. It is proper guidance is obtained. Notify the <br /> recommended that the maintenance agency local hazard control agency and CONTECH <br /> develop a database to properly manage Stormwater Solutions immediately. <br /> StormFilter maintenance programs. <br /> Prior to the development of the To conduct an inspection and /or minor <br /> maintenance database, the following <br /> maintenance: <br /> maintenance frequencies should be Important: Maintenance must be performed <br /> followed: by a utility worker familiar with StormFilter <br /> Inspection /minor maintenance units. <br /> • One time per year <br /> • After Major Storms 1. If applicable, set up safety equipment to <br /> protect pedestrians from fall hazards <br /> Major maintenance due to open vault doors or when work is <br /> • One time per year being done near walkways or roadways. <br /> • In the event of a chemical spill 2. Visually inspect the external condition of <br /> the unit and take notes concerning <br /> Frequencies should be updated as required. defects /problems. <br /> ©2006 CONTECH stormwater Solutions Toll -free: 600.548.4667 4 of 9 <br /> contechstormwater.com Vault, CIP and Linear StormFilter Operation and Maintenance Guidelines <br />