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bottom of the UST excavation contained 1,000 parts per million (ppm) total petroleum <br /> hydrocarbons as gasoline (TPHg), and one soil sample collected from the northern sidewall of <br /> the dispenser excavation contained 2 7 ppm TPHg Complete results of the UST removal <br /> are documented in Fugro's April 19, 1995 Underground Storage Tank Closure Report <br /> During February 1996, Enviros, Inc (Enviros) drilled two GeoProbe borings (GP-1 and <br /> GP-2) in the vicinity of the UST complex to investigate the extent of petroleum <br /> hydrocarbons detected during the December 1994 tank removal activities Enviros drilled <br /> one angle boring beneath the UST complex and one vertical boring adjacent to the UST <br /> complex Soil samples collected from GP-1 and GP-2 did not contain detectable <br /> concentrations of petroleum hydrocarbons but did contain MTBE at concentrations of <br /> 2 2 and 29 ppm, respectively The results of this investigation are documented in Enviros' <br /> May 8, 1996 Soil Boring Installation Report <br /> During January 1999, Cambria drilled five soil borings (SB-1 through SB-5) in the vicinity of <br /> the UST complex TPHg was detected only in boring SB-1 at a concentration of 3 17 ppm <br /> No benzene was detected in any of the soil borings MTBE was detected in all borings at <br /> • concentrations ranging from 0 00807 to 92 9 ppm Groundwater samples were collected <br /> from borings SB-3 and SB-4 Groundwater samples from SB-3 contained 46,000 parts per <br /> billion (ppb) TPHg, 243 ppb benzene, and 28,400 ppb MTBE Groundwater samples from <br /> SB-4 contained 6,610 ppb TPHg, 63 6 ppb benzene, and 9,080 ppb MTBE These results are <br /> summarized in Cambria's June 9, 1999 Site Investigation Report <br /> INVESTIGATION RESULTS <br /> Personnel Present Geologist Aubrey Cool directed the field sampling, working <br /> under the supervision of California Registered Geologist Joe <br /> Neely <br /> Permit Boring permit #020837 was obtained from SJCPHS/EHD <br /> (Appendix A) <br /> Drilling Company• Gregg Drilling, Inc of Martinez, California (C57 License <br /> #485165) <br /> I <br /> Drilling Dates November 1 through 3, 1999 <br /> Drilling Methods GeoProbe and 10-inch hollow-stem auger <br /> 955 2 <br />