9929 EVERGREEN WAY HORIZON BANK 2018-01-01 MF Import

_ � MAINTENANCE GUIDELINES STORMWi4TER M MAN.�GEMENT INC. Maintenance Guidelines The primary purpose of the StormFilter is to filter out and prevent pollutants from entering our waterways. Like any effective filtration system, periodically these pollutanls must be removed to restore the StormFilter to its full efficiency and effectiveness. Maintenance reyuirements and frequency are dependent on the poliutant load characteristics of each site. Maintenance activities may be required in the event of a chemical spill or due to excessive sediment loading from site erosion or extreme storms. It is also good practice to inspect the system after severe storm events. Types of Maintenance Presently, procedures h�ve been developed for two levels of maintenance: • Inspectionlminor maintenance • Major maintenance. Inspectionlminor maintenance activities are ccmbined since minor maintenance does not require special equipment and t,�pically little or no materials are in need of disposal. Inspection/minor maintenance typically involves: • Inspection of the vault itself • Removal of vegetation and trash and debris. Major maintenance typically includes: • Cartridge repiacement . Sediment removal Important: Applicable safety (OSHA) and disposal regulations should be foilowed during all maintei�ance activities. Maintenance Activity Timing Two scheduled inspectionslmaintenance 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 disposai 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 fiiter 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 hi�h 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 maior maintenance will occur in I�te summer to early fali when flows into the system are not likely to be present. Maintenance Activity Frequency The primary factor controiling timing of maintenance for the StormFiller is sedimentation. S�onnwaler Management, Ina C�2004 StormFilter Operation and Maintenance Guideline^ 3 of 9 3y