Laserfiche WebLink
ti <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 /> • 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, total xylenes, n-Propylbenzene, tert-Butylbenzene, <br /> and 1,2,4-Trimethylbenzene were detected in groundwater samples collected from <br /> boring SC-1 None of these contaminants were detected at concentrations <br /> exceeding their respective State of California Primary MCLs <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/1 <br /> • The estimated contaminant mass for the three potential water-bearing zones is <br /> presented in Table 2 <br /> • Based on these results, further investigation is not recommended <br /> azirozao2wR rwre�e�eas2n z ax 5-1 <br />