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Beacon Station No 641 June 13, 2000 Stockton California Results of Additional Subsurface Investigation _l of Byron, California and disposed to TPS Technologies Inc (TPS) of Richmond, California • The TPS Non-Hazardous Soils manifest is contained in Appendix E The monitoring wells were developed and sampled in accordance with Horizon's Field Methods and Procedures included in Appendix B Field purge and sample data were recorded on the Monitoring Well Data Sheets contained in Appendix F A well head survey was performed to establish the top-of-casing (TOC) elevations of the monitoring wells relative to the existing site wells The TOC elevation survey field data are contained Appendix G Initial groundwater samples were collected from monitoring wells MW-6, MW-7 and MW-8 on December 16, 1999 The groundwater samples were submitted to Kiff and analyzed for TPHg, BTEX and the seven oxygenates by EPA Method 8260B Groundwater analytical results for monitoring wells MW-6, MW-7 and MW-8 are summarized in Tables 2 and 3 Table 3 summarizes quarterly monitoring groundwater data collected since November 1996 CONCLUSIONS Five soil samples collected from soul boring B3 at depths ranging from 25 to 60 feet bsg were selected for analysis Analytical results indicate a TPHg concentration of 8 7 ppm and BTEX compounds ranging from 0 14 to 1 5 ppm m one sample collected at 35 feet bsg A benzene concentration of 0 016 ppm was reported in the 25-foot sample Concentrations of 0 017 ppm benzene and 0 0094 toluene were reported in the 45-foot sample A trace toluene concentration of 0 0053 ppm was reported in the 60-foot sample Concentrations of MTBE ranging from 4 2 to 0 021 ppm were reported in the five soil boring B3 samples The highest MTBE concentration was reported for the 35-foot sample and decreased with depth to 0 039 ppm at 60 feet bsg A 0 061ppm concentration of the fuel oxygenate TBA was reported in the 35-foot smaple No other TPHg, BTEX or fuel oxygenate concentrations were reported in the soil samples from soil boring B3 641AddSbsrfc1vest5-00 doc 6 HORIZON ENVIRONMENTAL INC. 164114