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6.0 CONCLUSIONS AND=RECOMMENDATIONS <br /> Data developed during the investigatiorn:of this site include subsurface soil and groundwater <br /> analytical data, quarterly groundwater monitoring, lithologic borehole logs, a water well survey, i <br /> development of a site conceptual m6del and a RBCA assessment. Based on the cumulative <br /> project analytical results, the San Joaquin Catholic Cemetery site appears to meet the following. <br /> criteria for case closure: <br /> 1 The leak has been stopped and rerr►aining petroleum hydrocarbons and fuel oxygenates <br /> "o <br /> appear to be insufficient to constituent and ongoing source. <br /> 2 The site has been adequately bh6racterized to a degree that has identified the lack of <br /> L) potential preferential pathways,:,ar d;the risk the site poses to sensitive receptors in the area. <br /> 3 The contaminant plume in groundwater has been demonstrated to be stable and declining in 4 <br /> concentration over more than five'years of groundwater monitoring. <br /> 4 No other waters of the state,,water.supply wells or other sensitive receptors are likely to be. <br /> gtiii. <br /> impacted by impacted soil and�groundwater at the site. <br /> L) <br /> 5 Based on a RBCA assessment;the site does not represent a significant risk to human health <br /> and safety. <br /> The site conceptual model and case closure analysis indicate that reasonable cleanup and <br /> EP t..ft l(y 1'�-1 f CLU}1!La fq <br /> abatement was.completed at the:site,,and that it is no longer technologically or economically <br /> feasible or necessary to continue corrective actions and monitoring. Although the current <br /> it, !.!: '. - hof' fir �dld* t <br /> concentration of MTBE in groundwater.exceeds water quality goals, it is projected to reduce to J <br /> L) levels protective of beneficial uses within a reasonable period of time. <br /> Based on these conclusions, Ramage Environmental recommends that the San Joaquin County <br /> EHD and RWQCB close this case,.and.issue a"No Further Action Required" letter. <br /> cis 1 <br /> I i <br />! s 25 I <br /> E � i <br /> f <br />