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1 Cahforrua Department of Transportation Revised September 23, 1994 <br /> Project No. 102818-01 <br /> detected in both of the soil samples, ranging in concentration from 4 67 milligrams per <br /> kilogram (mg/kg) to 30 7 mg/kg A summary of the results of the soil analysis is presented <br /> as Table 3. The laboratory analytical report,including quality control/quality assurance data <br /> and chain of custody documentation, is presented in Appendix D <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Based upon the results of this study, the following conclusions and recommendations are <br /> offered- <br /> Groundwater is present at the site at an approximate depth of 65 feet bgs The overall <br /> general groundwater flow direction is estimated to be toward the north at an <br /> approximate gradient of 0 0033 feet per foot <br /> ° The results of the groundwater sampling and analysis program indicate concentrations <br /> of TPH as gasoline ranging from less than the detection limit to 2,570 µg/e Elevated <br /> concentrations of BTEX were also detected in groundwater samples collected TPH as <br /> diesel was not detected in concentrations greater than the detection limit in any of the <br /> groundwater samples collected <br /> ° The benzene concentrations detected in groundwater samples (range from below <br /> detection hnut to 13,000 µg/f) exceed the Federal and California primary maximum <br /> contaminant levels for drinking water which are 5 µg/f and 1 µg/e, respectively <br /> Groundwater has been significantly impacted by the release of petroleum hydrocarbons <br /> and will require remediation to meet dnnlang water standards <br /> ° The results of the soil stockpile sampling and analysis program indicate that TPH as <br /> gasoline was not detected Benzene, ethylbenzene, and xylenes were also not detected <br /> in the soil stockpiles Elevated concentrations of toluene were detected, and total lead <br /> concentrations ranged from 4 67 mg/kg to 30 7 mg/kg <br /> ° Soil cuttings generated from monitoring well lowering and abandonment procedures <br /> was transported under manifest for disposal at the Forward, Inc Landfill located in <br /> Stockton California Water generated from sampling activities was transported under <br /> manifest for disposal at the Ramos Environmental Services facility located in West <br /> Sacramento, California. <br /> ° It is recommended that when the monitoring wells are reconstructed to grade, all <br /> monitoring wells be surveyed laterally and vertically to a known benchmark using a <br /> State of California licensed surveyor <br /> i <br /> 8 <br />