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- k l <br /> Commingled Plume#35 <br /> Chevron 9-4275/ARCO#2133 <br /> Site Conceptual Model <br /> September 1,2006 <br /> Page 9 <br /> 50 feet bgs at maximum concentrations of 72 pg/L and 7 pg/L, respectively. Grab groundwater <br /> sample results are included in Table:9. <br /> 4.2 ARCO 2133 Soil Borings <br /> Three soil borings (AS-8, AS-9, and AS-10) were advanced at the ARCO facility and one offsite <br /> soil boring (AS-11) was advanced east of the ARCO facility.. The onsite,soil borings were <br /> advanced between approximately 63 and 67.5 feet bgs. Soil samples were collected from each <br /> of the borings and submitted for laboratory analysis. TPHg was detected in all four soil borings <br /> above 23 feet bgs. The maximum concentration of TPHg was 1,000 mg/kg in AS-10 at 10.5 <br /> feet bgs. Benzene and toluene were detected in the soil sample collected from AS-10 at 23 feet <br /> bgs at concentrations of 0.0069 mg/kg and 0.20 mg/kg, respectively. Table 8 presents the soil <br /> analytical data. <br /> Groundwater samples were also collected from the bottom of each of the soil borings. TPHg, <br /> ethylbenzene, and xylenes were only detected in AS-10 at maximum concentrations of <br /> 320 pg/L, 2.9 pg/L, and 36 pg/L, respectively. MtBE was detected in both AS-9 and AS-10 at <br /> maximum concentrations of 36 pg/L and 1.8 pg/L, respectively. TBA and 1,2-DCA were only <br /> detected in the sample from AS-9 at a concentrations of 61 pg/L and 1.2 pg/L, respectively. <br /> Groundwater sample results are presented in Table 9. <br /> C <br /> 94275-ARCO 2133 SCM 9-2006 9 <br />