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January 10, 1996 <br /> Page 3 <br /> SCOPE OF WORK / <br /> To further investigate soil conditions at the site, the following scope of work was <br /> performed , <br /> Soil Boring Installation. PACIFIC drilled five soil borings (B-1 <br /> through B-5) on September 22, 1995 The borings were drilled to <br /> investigate soil conditions in the vicinity of the current USTs and <br /> former product islands (Figure 1) Boring B-3 was not completed <br /> due to drilling refusal, it appeared that this refusal was caused by <br /> something metallic in nature, possibly former product piping Two <br /> additional boring locations near Boring B-3 were attempted Both of <br /> these borings were also terminated at a depth of 4 feet due to drilling <br /> refusal <br /> Soil Analysis. Selected soil samples were submitted to a California <br /> State-certified laboratory and analyzed for the presence of TPPH-g, <br /> and benzene, toluene, ethylbenzene, and xylenes (BTEX compounds) <br /> FINDINGS <br /> Subsurface Conditions <br /> Soils underlying the site (based on drilling) were as anticipated and consisted of inter- <br /> bedded clays, sands, and silts Clays and sands were generally between 10 and <br /> 14-112 feet bgs These were underlain by a clayey silt to the total depth explored of <br /> 20-112 feet bgs <br /> Groundwater was not encountered in the borings <br /> r <br /> Soil Analytical Results <br /> Hydrocarbons as gasoline were not detected in soil samples with the exception of <br /> Boring B-3 at 2 feet bgs (56 ppm) Benzene was not detected in any samples Soil <br /> analytical data are presented in Table 1 <br /> Conclusions <br /> Based on the results of this investigation of the former product islands and the area <br /> upgradient to Monitoring Well MW-2, the source for hydrocarbons in Well MW-2 has \ <br /> not been identified <br /> i <br /> 3201351 AXREPORT <br />