Laserfiche WebLink
Commingled Plume#35 S E C ® R <br /> Chevron 9-4275/ARCO#2133 <br /> Site Conceptual Model M <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 /> 42 ARCO 2133 Soil Borings <br /> Three soil borings (AS-8, AS-9, and AS-10) were advanced at the ARCO facility and one offslte <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 /> k <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 /> 94275-ARCO 2133 SCM 9-2006 9 <br />