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Beacon Station No 419 August 2, 1996 <br /> . Stockton,California Assessment Report <br /> bgs in boring SB-4 Gasoline hydrocarbons were detected in soil samples from boring SB-5 <br /> with the highest concentrations being 4 1 ppm TPHg and 0 44 ppm benzene in the soil <br /> sample collected at 55 feet bgs MTBE was not present above the laboratory reporting limits <br /> in any of the soil samples analyzed. Laboratory results are summarized in Table 1 <br /> Laboratory analytical reports and COC forms are included in Appendix E <br /> Groundwater Samples <br /> Groundwater samples collected from groundwater monitoring wells MW-4 through MW-6 <br /> was submitted to WEST under COC Groundwater samples were analyzed for TPHg, <br /> BTEX, and MTBE by modified EPA methods 3550180151602 These laboratory results are <br /> summarized in Table 2 Gasoline hydrocarbons were detected in the water samples collected <br /> from wells MW-5 and MW-6 with reported concentrations of 70 parts per billion (ppb) and <br /> 88 ppb, respectively BTEX and MTBE were not present above the laboratory reporting <br />• limits in any of the water samples Laboratory analytical reports and COC forms for the <br /> groundwater samples are included in Appendix E <br />• 1419 11-RPT 6 HORIZON ENVIRONMENTAL INC <br />