MCU16/0012 Attach B Engineering report & SMP

                                                             SECTION 2


                  RECOMMENDED MAINTENANCE AND EXPECTED PERFORMANCE

2.1       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 the minor maintenance
does not require special equipment and typically little or no materials are in need of disposal.
Inspection/minor maintenance typically involves opening the flow restricting valves (to pre-set levels) and
cleanup 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: StormFilter

     Facility Component               Maintenance                    When Maintenance Activity                  Expected Facility Performance
   Requiring Maintenance                Activity                           Is Required                                After Maintaining

StormFilter Cartridges and   Trash and Debris Removal         Floatable objects or other trash is          Permanent removal from storm
Containment Structure                                          present in the filter. Remove to avoid       system.
                                                               hindrance of filtration and eliminate
                                                               unsightly debris and trash.



                              Cartridge Replacement and        1. Media has been contaminated by            1. New media is able to effectively
                              Sediment Removal                 high levels of pollutants, such as after a   treat stormwater.
                                                               spill.



Drainage System Piping        Flushing With Water              Drainage system is obstructed by debris      Outflow is not restricted.
                                                               or sediment.




2.2       MAINTENANCE ACTIVITIES

2.2.1     Maintenance Activity Timing

Two scheduled inspections/maintenance activities should take place during the year. During the minor
maintenance activities (routine inspection, debris removal), the type of major maintenance required is
determined and, if required for disposal, samples of the sediments and media are obtained. The next
scheduled date is to perform major maintenance activities (replacement of the filter cartridges and associated
sediment removal). In addition to the scheduled activities, it is important to check the condition of the filter
after major storms to check for damage caused by high flows and to check for high sediment accumulation,
which may be caused by localised erosion in the drainage area. It may be necessary to adjust maintenance
activity scheduling depending on the actual operating conditions encountered by the system.




2.2.2     Maintenance Activity Frequency


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