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Maintenance Guidelines In addition to these two activities, it is important to check <br /> The primary purpose of the Stormwater Management the condition of the StormFilter unit after major storms for <br /> potential damage caused by high flows and for high sediment <br /> StormFilter'a'is to filter out and prevent pollutants from entering accumulation that may be caused by localized erosion in the <br /> our waterways. Like any effective filtration system, periodically drainage area. It may be necessary to adjust the inspection/ <br /> these pollutants must be removed to restore the StormFilter to its maintenance schedule depending on the actual operating <br /> full efficiency and effectiveness. conditions encountered by the system. In general, inspection <br /> Maintenance requirements and frequency are dependent on the activities can be conducted at any time,and maintenance should <br /> pollutant load characteristics of each site. Maintenance activities occur, if warranted, in late summer to early fall when flows into <br /> may be required in the event of a chemical spill or due to the system are not likely to be present. <br /> excessive sediment loading from site erosion or extreme storms. It <br /> is a good practice to inspect the system after major storm events. Maintenance Frequency <br /> The primary factor controlling timing of maintenance of the <br /> Maintenance Procedures StormFilter is sediment loading. <br /> Although there are likely many effective maintenance A properly functioning system will remove solids from water by <br /> options, we believe the following procedure is efficient and trapping particulates in the porous structure of the filter media <br /> can be implemented using common equipment and existing inside the cartridges.The flow through the system will naturally <br /> maintenance protocols. A two step procedure is recommended decrease as more and more particulates are trapped. Eventually <br /> as follows: the flow through the cartridges will be low enough to require <br /> 1. Inspection replacement. It may be possible to extend the usable span of the <br /> Inspection of the vault interior to determine the need for cartridges by removing sediment from upstream trapping devices <br /> maintenance. on a routine as-needed basis in order to prevent material from <br /> being re-suspended and discharged to the StormFilter treatment <br /> 2. Maintenance <br /> system. <br /> Cartridge replacement <br /> Sediment removal Site conditions greatly influence maintenance requirements. <br /> StormFilter units located in areas with erosion or active <br /> Inspection and Maintenance Timing construction may need to be inspected and maintained more <br /> At least one scheduled inspection should take place per year with often than those with fully stabilized surface conditions. <br /> maintenance following as warranted. The maintenance frequency may be adjusted as additional <br /> First,an inspection should be done before the winter season. monitoring information becomes available during the inspection <br /> During the inspection the need for maintenance should be program.Areas that develop known problems should be <br /> determined and, if disposal during maintenance will be required, inspected more frequently than areas that demonstrate no <br /> samples of the accumulated sediments and media should be problems, particularly after major storms. Ultimately, inspection <br /> obtained. and maintenance activities should be scheduled based on the <br /> historic records and characteristics of an individual StormFilter <br /> Second, if warranted, a maintenance(replacement of the filter system or site. It is recommended that the site owner develop <br /> cartridges and removal of accumulated sediments)should be a database to properly manage StormFilter inspection and <br /> performed during periods of dry weather. maintenance programs. <br /> Prior to the development of the maintenance database,the <br /> following maintenance frequencies should be followed: <br /> u Inspection <br /> One time per year <br /> r t After major storms <br /> + ��s 0Maintenance <br /> r • As needed, based on results of inspection(The average <br /> o', .,,,_.;A-t,,,..:, <br /> , maintenance lifecycle is approximately 1-3 years) <br /> 5., Y 4 ... -` '1 ,. .-.• ; Per Regulatory requirement <br /> : . In the event of a chemical spill <br /> q i y V'• '' Frequencies should be updated as required.The recommended <br /> initial frequency for inspection is one time per year. StormFilter <br /> .,, .yy 'I+ �r A units should be inspected after major storms. <br />