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Perform Quarterly Performance Monitoring <br /> urn off extraction <br /> Review data from each well. Does chromium wells C the <br /> No Yes vicinity. Consider <br /> concentration exceed WQO(50µg/L)? <br /> additional <br /> ompliance point <br /> Is the well in question a Yes If well is an extraction well,do <br /> compliance or background well? chemical parameters indicate <br /> potential for in situ chromium Ycs <br /> reduction? <br /> No No Continue <br /> Performance <br /> Monitoring at No <br /> Compliance and <br /> Turn off Background wells <br /> extraction during each quarter Do chemical data show a reactive area/barrier either: <br /> wells in the of Performance 1) Upgradient from this well,from where treated groundwater <br /> vicinity. Monitoring at other will migrate and cause chromium reduction;or <br /> well(s). Reduce 2) Downgradient of the well,where reduction will occur as <br /> nalytical suite,a groundwater migrates? <br /> propriat <br /> Yes Has the chromium concentration has been <br /> below WQO for more than 1 year? No <br /> Yes Has more than 2 years elapsed <br /> between the most recent <br /> injection phase targeting the No <br /> area near the well and the date <br /> Is there a geochemical or hydrogeologic of sample collection? <br /> indication that concentrations will increase to <br /> above WQO? <br /> Yes <br /> <i> <br /> Does there appear to be migration of groundwater from this well <br /> with chromium concentrations above the WQO(50µg/L)toward a <br /> domestic or production well without mitigation through natural <br /> attenuation or hydraulic capture? <br /> e <br /> ce <br /> g as Implement active <br /> n the remediation <br /> P (supplemental injection or FORMER MARLEY COOLING TOWER COMPANY <br /> ue <br /> pump-and-treat)to target Yes STOCKTON,CALIFORNIA <br /> area of unmitigated <br /> nce DECISION LOGIC DIAGRAM FOR PERFORMANCE <br /> n chromium migration. MONITORING DATA EVALUATION <br /> FIGURE 5 <br />