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12/30/2003 16:30 4257780409 THE FiCIJAUGHTON GROUP <br />Table 2. RQcommended maintenancc timas for tlio Paciflc Northwast <br />Soason <br />W ET <br />L�1L�1 <br />Month � JAN �EI3 MAR APR MAY JUN I �UL AUG SEP <br />Y. X X I XX XX XX <br />WET <br />OCT NOV DEC <br />X= Schedule minor mainlenunce inspecllon end medla sampling during one of Ihese monlhs <br />XX = Schedule maJor mAfnlenance during one oi lhese months <br />Maintenance Activity Frequency <br />PAGE 07 <br />The primary factor controlling timing of maintenance for the StormFiller Is sedimenlalion. A properly <br />functioning system will remove solids from waler by trapping particulates in the porous struclure of <br />lhe filter media. The ilow throuc�h the system �vil) natufally d�acrease �s more and more solids are <br />trapped. Eventually che flow through the system will bo low enough tc, requfre replacement of the <br />carlridges. It may be possihle to extend the usable span of Ute cartridges by removing sedimsnt irom <br />upstream trapping devices on an as-needed basis in order to prevent material from being r�- <br />suspended and discharged io lhe syslem. <br />Site conditions greally infiuence maintenance requiremenls. StorrnFilter units located ln areas with <br />erosion or active construcifon sl�ouid be inspected and maintained more often than those in fully <br />stabilized areas. lhe maintonance freyuency may be adJ�sted as additional monitoring infomlaliun <br />becomos available during the inspeclion program. Areas that develop known problems siiould bo <br />inspected more frequently than arc�as lhat demonslrate no problems, particularly after larye storms. <br />Ultimately, inspeclion and maintenance activities shouid be scheciuled based on the historlc records <br />and characterislics of an fndividual StormFUler syslem. It (s recommended that lhe mainlenance <br />agency develop a database lo pmporly rnanage StormFilter mainlenance ptograrns. <br />Prior to ihe development of Ihe maintenance database, the following mainlenance frequencies should <br />ba followed: <br />Inspectionlminor mnh�tenance <br />(timealyoar) <br />1 tand a(ter major slonns) <br />Majur maintonance <br />(timaslyeer) <br />1(excrpt in case of a spIIQ <br />Frequencies should Ue updated as reyuired. The rocommended inilial frequency for inspection/minor <br />mainlenance Is two times por ye�.r (or the precast uNt. StormFiiter unils should be inspecled a(ter all <br />major stonns. Sediment removal and cartridge replacement on an annual basis is recommend,:d <br />unti! fL+rti�er knowledge Is gained obout a parlicular sys(em. <br />T f300.54[�.4667 F 000.5G1.1271 W www.s[ormwaterinc.com 6 <br />1 <br />