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� . <br /> ( . . <br /> A properly functioning system will remove The recommended initial frequency tor <br /> � � solids from water by trapping particulates in inspection/minor maintenance is two times <br /> the porous structure of the filter medla. The per year for the precast unit. StormFilter <br /> flow through the system wili naturaliy unils should be inspected after all major <br /> decrease as more and more solids are storms. Sediment removal and cartridge <br /> ( trapped. Eventually the flow through the replacement on an annual basis is <br /> ! system will be Iow enough to require recommended until further knowledge is <br /> replacement of the cartridges. !t may be gained about a particular system. <br /> ' possible to extend the usabie span of the <br /> cartridges by removing sediment from Once an understanding of site <br /> upstream trapping devices on an as-needed characteristi , has been astablished, <br /> I ' 6asis in order to prevent material from being maintenance may not be needed for one to ' <br /> re-suspended and discliarged to the two years, but inspection is warranted. <br /> system. <br /> � � � Maintenance Methods <br /> Site conditions greatly infiuence <br /> maintenance requirements. StormFilter InspectionlMinor Maintenance <br /> � � units located in areas with erosion or active <br /> i construc:ion should be inspected and The primary goal of a maintenanre <br /> maintained more often than those in fully inspection is to assess the condition of the <br /> � , stabilized areas. cartridges relative to the level of sediment <br /> The maintenance frequency may be �oading. It may be desirable to conduct this <br /> � � adjusted as additional monitoring �nspection during a storm to observe the <br /> information becomes available during the relative flow through the filter ca�tridges. if <br /> the submerged cartridges are saverely <br /> inspection program. Areas that develop p�ugged, large amounts of sedime,its will be <br /> I known probiems should be inspected more present and very little flow wiil bF; <br /> frequently than areas that demonstrate no discharged from the drainage pipe;•. If this <br /> � problems, particuiarly a8er larc�e storms. is the case, it is likely that the cartridges <br /> • Ultimalely, Inspection and maintenance need to be replaced. <br /> activities should be scheduled based on the yyarning: In ths case of a splll, the worker <br /> 1 historic records and characlerislics of an shouid abort maintenance activities until the <br /> individual StormFilter systern. It �s p�oper guidance is obtained. Noti(y the <br /> recommended that tho maintenance ac�ency iocal hazard controt agency a�d Stormwaler <br /> � develop a dalabase to proparty manage Management inc. immediately. <br /> SlormFiiter maintenance programs. <br /> Prior to the deveiopment of the To conduct an inspection and/or minor <br /> � maintenance database, the following maintenance: <br /> � maintenance frequencies should be <br /> followed: Important: Maintenance must be pe�formed <br /> � by a utility worker familiar with StormFilter <br /> Inspection/minor maintenance units. <br /> • One time per year <br /> • After Majur Storms 1. If applicable, set up safety equipment to <br /> j . protect pedestrians from fall hazards <br /> Major maintenance due to open vault doors or when work is <br /> • One time per year 6eing done near walkways ur roadways. <br /> • In the event of a chemical spill 2, b'isually inspect the externa� condition of � <br /> F lhe unit and take notes concerning <br /> Frequen^les should be updaled as required. cefecis;problems. ; <br /> � Stormwater Managomenl, Inc.002004 SlormFlltor Operation and Maintenance Guide�(nes 4 of 9 � � <br /> =i <br />