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Table 2. Recommended rr"aintenance times for the Pacific Northwest <br /> Season WET i DRY I WET <br /> Month JAI FES MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br /> Maintenance <br /> Required I X X X XX XX XX <br /> X=Schedule minor maintenance inspection and media sampling during one of these months <br /> XX= Schedule major maintenance during one of these months <br /> Maintenance Activity Frequency <br /> The primary factor controliing timing of maintenance for the StormFilter is sedimentation. A properly <br /> functioning system will remove solids from water by trapping particulates in the porous structure of the <br /> filter media. The flow through the system will naturally decrease as more and more solids are <br /> trapped. Eventually the flow through the system will be low enough to require replacement of the <br /> cartridges. It may be possible to extend the usable span of the cartridges by removing sediment from <br /> upstream trapping devices on an as-needed basis in order to prevent material from being re- <br /> suspended and discharged to the system. <br /> Site conditions greatly influence maintenance requirements. StormFilter units located in areas with <br /> erosion or active construction should be inspected and maintained more often than those in fully <br /> stabilized areas.The maintenance frequency may be adjusted as additional monitoring information <br /> becomes available during the inspection program. Areas that develop known problems should be <br /> inspected more frequently than areas that demonstrate no problems, particularly after large storms. <br /> Ultimately, inspection and maintenance activities should be scheduled based on the historic records <br /> and characteristics of an individual StormFilter system. It is recommended that the maintenance <br /> agency develop a database to properly manage StormFilter maintenance programs. <br /> Prior to the development of the maintenance database,the.following maintenance frequencies should <br /> be followed: <br /> Inspection/minor maintenance Major maintenance <br /> (times/year) (times/year) <br /> 1 (and after major storms) 1 (except in case of a spill) <br /> Frequencies should be updated as required. The recommended initial frequency for inspection/minor <br /> maintenance is two times per year for the precast unit. StormFilter units should be inspected after all <br /> major storms. Sediment removal and cartridge replacement on an Annual basis is recommended until <br /> further knowledge is gained about a particular system. <br />