12728 19TH AVE SE BASE FILE 2025-07-29

Types of Maintenance Presently, procedures have been developed for two levels of maintenance: inspection/minor maintenance and major maintenance. Inspection/minor maintenance activities are combined since minor maintenance does not require'special equipment and typically little or no materials are in need of disposal. inspection/minor maintenance typically involves inspection of the vault itself and removal of vegetation and debris. Major maintenance typically includes cartridge recharging. Major maintenance may involve disposal of materials that require consideration of regulatory guidelines. Depending on the particular unit configuration and equipment used, major maintenance may require an understanding of OSHA rules. Table 1 summarizes the primary activities associated with StormFilter maintenance. • Table 1. Primary StormFilter maintenance activities Type Maintenance Facility Component Signs that a Expected Facility Activity Requiring Maintenance Activity Performance After Maintenance, is Required Maintaining Minor Trash and debris StormFilter cartridges. Floatable objects or other Unsightly debris is removal and containment trash is present in the permanently removed structure filter.Remove to avoid from storm system. hindrance of filtration and Filtration is not hindered eliminate unsightly debris by floatable objects. and trash. • Major Cartridge StormFilter cartridges Cartridges are occluded Refreshed cartridges are replacement and and containment with omi sesediment; heavy visiblent is abller .to effectively treat sediment removal structure unifon cartridge tops. Maintenance Activity Timing Two scheduled inspections/maintenance activities should take place during the year. First, an inspection/minor maintenance activity should be done. During the minor maintenance activity (routine inspection, debris removal),the need for major maintenance should be determined and, if disposal during major maintenance will be required, samples of the sediments and media should be obtained. Second, if required, a major maintenance activity (replacement of the filter cartridges and associated sediment removal) should be performed. In addition to these two scheduled activities, it is important to check the condition of the StormFilter unit after major storms for damage caused by high flows and for high sediment accumulation that may be caused by localized erosion in the drainage area. It may be necessary to adjust the maintenance activity schedule depending on the actual operating conditions encountered by the system. In general, minor maintenance activities will occur late in the rainy season, and major maintenance will occur in late summer to early fall when flows into the system are not likely to be present. The months indicated in Table 2 below show the recommended times of year for maintenance activities to occur in the Pacific Northwest.