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