9212 HOLLY DR 2018-01-02 MF Import

I 1 I 1 1 1 1 1 A properly functioning system will remove solids from water by trapping particulates in the porous stnicture of the filter media. The flow through the system will naturally decrease as more and more solids are trapped. Eventually the flow through the system will be low enough to require replacement of the cartridges. It may be possible to extend the usably span of the cartridges by removing secionant from upstream trapping devices on an as -needed basis in order to prevent material from beirg re -suspended and discharged to the system. Site conditions greatly influence maintenance requirements. StormFilter units located in areas with erosion or active construction should be inspected and maintained more often than those in fully stabilized areas. The maintenance frequency may be adjusted as additional monitoring information becomes available during the inspection program. Areas that develop known problems should be inspected 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 StormFilter system. It is recommended that the maintenance agency develop a database to properly manage StormFilter maintenance programs. Prior to the development of the maintenance database, the following maintenance frequencies should be followed: Inspection/minor maintenance • One time per year • After Major Storms Major maintenance • One time per year • In the event of a chemical spill Frequencies should be updated as required. The recommended initial frequency for inspection/minor maintenance is two times per year for precast units. StormFilter units should be inspected after all major storms. Sediment removal and cartridge replacement on an annual basis is recommended until further knowledge is gained about a particular system. Once an understanding of site characteristics has been established, maintenance may not be needed for one to two years, but inspection is warranted. Maintenance Methods Inspection/Minor Maintenance The primary goal of a maintenance inspection is to assess the condition of the cartridges relative to the level of sediment loading. It may be desirable to conduct this inspection during a storm to observe the relative flow through the filter cartridges. If the submerged cartridges are severely plugged, large amounts of sediments will be present and very little flow will be discharged from the drainage pipes. If this is the case, it is likely that the cartridges need to be replaced. Warning: In the case of a spill, the worker should abort maintenance activities until the proper guidance is obtained. Notify the local hazard control agency and CONTECH Stormwater Solutions immediately. To conduct an inspection and/or minor maintenance: Important: Maintenance muse be performed by a utility worker familiar with StormFilter units. 1. If applicable, set up safety equipment to protect pedestrians from fall hazards due to open vault doors or when work is being done near walkways or roadways. 2. Visually inspect the external condition of the unit and take notes concerning defects/problems. 02006 CONTECH Storrnwater Solutions Toll -free: 800.548.4667p�-may-P 4of0 1 wntectistorr watercom Vault. CIP and Linear StonnFiteroperation and Maintenance Guidelines