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A properly functioning system will remove <br />solids irom water by trapping paRiculates in <br />the porous structure of the filter media. The <br />flow through the system will naturally <br />decrease as more and more solids are <br />trapped. Eventually the (low through the <br />system will be low enough to require <br />replacement of the cartridges. It may be <br />possible to extend the usable span of the <br />cartridges by removing sediment from <br />upstream trapping devices on an as-needed <br />basis in order to prevent material from being <br />re-suspended and discharged to the <br />system. <br />Site conditions greatly infiuc�ce <br />maintenance requirements. StormFilter <br />units located in areas with erosion or active <br />construction should be inspected and <br />maintained more often than those in fully <br />stabilized areas. <br />The maintenance frequency may be <br />adjusted as additionai moniloring <br />iniormation becomes available during the <br />inspection program. Areas that develop <br />known probiems should be inspecled more <br />frequenlly than areas that demonstrate no <br />problems, particularly after large storms. <br />Ultimalely, inspection and maintenance <br />activities should be scheduled based on the <br />historic records and characteristics of an <br />individual StormFilter system. It is <br />recommended that lhe maintenance agency <br />develop a database to properly manage <br />StormFilter maintenance programs. <br />Prior to the development o( the <br />maintenance database, the following <br />maintenance frequencies should be <br />followed: <br />Inspectionlminor maintenance <br />• One time per year <br />. After Major Storms <br />Major maintenance <br />. One time per year <br />• In the event o( a chemical spill <br />Frequencies should be updated as required. <br />The recommended initial fre:quency for <br />inspectionlminor rceintenance i:, two times <br />per year for the pre�ast unit. StormFiiter <br />unils should be inspected after ali major <br />storms. Sediment removal and cartridge <br />replacement on an annual basis is <br />recommended until further knowledge is <br />gained about a particular system. <br />Once an understanding of site <br />characteristics has been established, <br />mainteiiance may not be needed for one to <br />two years, but inspection is warranted. <br />Maintenance Methods <br />InspectionlMinor Maintenance <br />The primary goal of a maintenance <br />inspection is to assess the condition of the <br />cartridges relative to the level oF sediment <br />loading. It may be desirable to conduct this <br />inspection duri�g a storm to observe the <br />relative flow through the filter cartridges. If <br />the submerged cartridges are severely <br />plugged, large amounts of sediments will be <br />present and very little ilow will be <br />discharged from the drainage pipes. I( this <br />is the case, it is likely that the cartridges <br />need to be replaced. <br />Warning: In the case of a spill, the worker <br />should abort maintenance activities until the <br />proper guidance is obtained. Notify the <br />local hazard control agency and Stormwater <br />Management Inc. immediately. <br />To conduct an inspection andlor minor <br />maintenance: <br />Important: Maintenance must be performed <br />by a utility worker familiar wilh StormFilter <br />u�its. <br />I( appiicable, set up safety equipment to <br />protect pedestrians from fall hazards <br />due to open vault doors or when work is <br />beir,g done near walkways or roadways. <br />Visuaily inspect the extemal condition o( <br />the unit and take notes concerning <br />defects/problems. <br />Stormwater Managemenl, Inc. �2004 StormFiltar Operation and Maintenance Guidelines 4 of 9 <br />