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f <br /> Former Beacon Station No 419 February 17, 1999 <br /> Stockton California Additional Subsurface Investigation <br /> Laboratory analytical results reported no detectable gasoline hydrocarbons in the soil <br /> samples collected from borings SB-7, SB-9, MW-7 and MW-8 The soil samples collected <br /> from boring SB-6 indicated detectable concentrations of TPHg and BTEX, while the soil <br />' samples collected from boring SB-9 only indicated detectable concentrations of BTEX and <br /> no detectable concentrations of TPHg No detectable concentrations of the seven <br /> oxygenated fuel additive compounds were reported from the 33 soil samples analyzed, <br /> except for a low concentration of 0 41 ppm of ethanol detected in soil sample S-41-SB6 <br />' The results of the laboratory soil analyses are summarized in Table 1 Laboratory analytical <br /> data and COC reports are included in Appendix F <br />' Groundwater Samples <br /> The groundwater samples from wells AS-1, MW-7 through MW-10, and boring SB-6 were <br /> submitted to Kiff under COC Requested analyses were TPHg and BTEX by EPA Methods <br /> 8015/8020/8260B, and the seven oxygenated fuel additive compounds MTBE, DIPE, ETBE, <br /> TAME, TBA, methanol, and ethanol by modified EPA Method 8260 <br /> Laboratory results for the groundwater samples reported TPHg in each of the five wells and <br /> the SB-6 HydroPunch8' sample BTEX compounds were detected in four of the five wells <br /> (not in well MW-7) and the SB-6 HydroPunch® sample The oxygenated fuel additive <br /> compounds MTBE, TBA, and ethanol were detected in each of the groundwater samples <br /> collected from the five wells, but not in the SB-6 HydroPunch'�' sample Laboratory results <br /> for the groundwater samples are summarized in Table 2 Laboratory analytical data and <br /> COC reports are included in Appendix G <br /> I <br /> 1419-12 rpt 9 HORIZON ENVIRONMENTAL INC. <br />