Appendix C - Stormwater Management Plan

2.2 Maintenance activities                                                 2.2.2 Maintenance activity frequency

                                                                           The primary factor controlling timing of maintenance for the
                                                                           StormFilter is sedimentation. A properly functioning system
2.2.1 Maintenance activity timing                                          will remove solids from water by trapping these particulates
                                                                           within the porous structure of the media. The flow through
Two scheduled inspections/maintenance activities should take
                                                                           the system will naturally decrease as more and more solids
place during the year. During the minor maintenance activities
                                                                           are trapped. Eventually the flow through a system will be
(routine inspection, debris removal), the type of major
                                                                           low enough to require replacement of the cartridges. Sediment
maintenance required is determined and, if required for
                                                                           should be removed from upstream trapping devices on an
disposal, samples of the sediments and media are obtained.
                                                                           as-needed basis to prevent material from being re-suspended
The next scheduled date is to perform major maintenance                    and discharged to the system.
activities (replacement of the filter cartridges and associated
                                                                           Site conditions greatly influence maintenance requirements.
sediment removal). In addition to the scheduled activities, it
                                                                           StormFilter units located in areas with erosion or active
is important to check the condition of the filter after major
                                                                           construction should be inspected and maintained more
storms to check for damage caused by high flows and to
                                                                           often than those in fully established areas. The maintenance
check for high sediment accumulation, which may be caused
                                                                           frequency may be adjusted as additional monitoring
by localised erosion in the drainage area. It may be necessary
                                                                           information becomes available during the inspection program.
to adjust maintenance activity scheduling depending on the
                                                                           Areas that develop known problems should be inspected
actual operating conditions encountered by the system.
                                                                           more frequently than areas that demonstrate no problems,
                                                                           particularly after large storms. Ultimately, inspection and
                                                                           maintenance activities should be scheduled based on the
                                                                           historic records and characteristics of an individual filter.



2.3 Maintenance crew requirements
Table 2 lists the anticipated crew requirements for                        applicable occupational health and safety (OH&S) and disposal
maintenance operations. Removal of water and sediments                     regulations should be followed. A general description of the
during major maintenance activities can be accomplished                    maintenance activities follows.
using either a pump and water truck or a vacuum truck. All


Table 2 Anticipated Crew Requirements

                                               Inspection/Minor       Major Maintenance:          Major Maintenance:
                                               Maintenance            Sediment Removal            Cartridge Replacement

  Labourer                                     1                                                  1

  Skilled Worker                               1                      1                           1

  Vacuum/Water Truck Operator                                         1                           0/1

  Total                                        2*                     2*                          2/3*

  Special Requirements                         Knowledge of Proper    Knowledge of                Knowledge of Cartridge Removal
                                               StormFilter Function   Disposal Requirements       and Installation Procedures

* May require OH&S trained person if/when vault entry occurs.




22   Stormwater360 Operations and maintenance