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r <br /> CAMBRIA <br /> xylenes Complete results of the UST removal are documented in the Fugro West, Inc , April <br /> 19, 1995 Underground Storage Tank Closure Report <br /> During February 1996, Enviros, Inc (Enviros) drilled two GeoProbe borings (GP-1 and GP-2) <br /> in the vicinity of the UST complex to investigate the extent of petroleum hydrocarbons <br /> detected during the December 1994 tank removal activities Enviros drilled one angled <br /> boring beneath the UST complex and one vertical boring adjacent to the UST complex Soil <br /> samples collected from both borings did not contain detectable concentrations of petroleum <br /> hydrocarbons, but did contain MTBE at concentrations ranging from 2 2 to 29 ppm This <br /> investigation is summarized in Enviros' May 8, 1996 Sod Borings Installation Report <br /> INVESTIGATION RESULTS <br /> Personnel Present Geologist Aubrey Cool directed the field sampling, working <br /> under the supervision of California Professional Engineer <br /> Diane Lundquist <br /> Permit Boring permit #017903 was obtained from the SJCPHS <br /> (Appendix A) <br /> Drilling Company Gregg Drilling, Inc of Martinez, California (C57 License <br /> #485165) <br /> Drilling Dates• January 14 and 15, 1999 <br /> Drilling Methods 4- and 6-inch hollow-stem augers <br /> Sampling Methods Soil Irthology was logged using the Unified Soil Classification <br /> System and the Munsell Color chart Encountered lithology is <br /> described on the exploratory boring logs presented in <br /> Appendix B Soil samples were collected at 5-foot intervals <br /> from the borings for lithologic description, potential chemical <br /> analysis, and head-space analysis Soil samples were screened <br /> for the presence of organic vapors using a photo-ionization <br /> detector (PID) PID readings are recorded on the boring logs <br /> • Number of Borings Five borings (SB-1 through S13-5) Boring specifications are <br /> described on Table 1 and locations are shown on Plate 2 <br /> 241-0955 2 <br />