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r <br /> R <br /> 5.0 Conclusions and Recommendations <br />' On behalf of Caltrans, IT conducted site investigation activities on February 13 and 14, 2002 to <br />' assess petroleum hydrocarbon impacts to groundwater at the project site Based on the <br /> laboratory results of ITs investigation, current regulatory guidelines, and the professional <br /> judgement of IT, the following conclusions and recommendations are offered <br /> •r <br /> Two boring locations were evaluated for unreported utility clearance using <br /> geophysical methods No anomalies were found near the boring locations <br /> • TPHg, toluene, ethylbenzene, and total xylenes were detected in groundwater <br /> samples collected from boring SC-1 None of these contaminants were detected at <br /> concentrations exceeding their respective State of California Primary MCLS <br /> • The constituents n-Propylbenzene, tert-Butylbenzene, and 1,2,4-Tnmethylbenzene <br /> were detected in groundwater samples collected from boring SC-1 <br /> • Benzene was detected in groundwater samples SC-1-90' and SC-1-100' at <br /> concentrations exceeding the State of California Primary MCL of 1 µg/l <br /> • The estimated contaminant mass for the three potential water bearing zones is <br /> presented in Table 2 <br /> • Based on results from this investigation, IT recommends that a Remedial Action <br /> Plan be prepared in order to perform remedial activities to clean up the site <br /> r <br /> r <br /> r <br /> r <br /> r <br /> r <br /> r <br /> r <br /> WO—D-7-admioq lr SACRFPIICOMMONlsacDP20"finR,MWU772m doe 5-1 <br /> a14Mz <br />