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SUBSURFACE SOIL AND GROUNDWATER ASSESSMENT REPORT <br /> Deltech Geotechnical Inc performed the UST removal Ground Zero Analysts, Inc conducted <br /> ' the required soil sampling All removal and soil sampling activities were observed by and <br /> completed under the direction of Mr Michael Kift and Mr Vidal Pedraza of San Joaquin County <br /> Environmental Health Division(SJCEHD) <br /> ' <br /> PREVIOUSLY DETECTED PETROLEUM HYDROCARBONS IN SOIL <br /> ' Soil samples were collected beneath the northern and southern ends of the tank at 13 feet below <br /> ground surface (bgs) Additional soil samples were obtained from stockpiled soil No <br /> groundwater was encountered dunng tank removal activities Laboratory analysis of soil samples <br /> detected concentrations of MTBE beneath the tank and in the stockpiled soil The SJCEHD <br /> requested soil samples be analyzed for total purgeable petroleum hydrocarbons as gasoline <br /> UPHG), benzene, toluene, ethylbenzene and xylene (BTEX), MTBE, di-isopropyl ether (DIPS) <br /> ethyl tertiary butyl ether(ETBE),tertiary amyl methyl ether(TAME),and tertiary butanol (TBA) <br /> Soil samples collected from the bottom of the UST pit contained detectable levels of MTBE <br /> Laboratory analytical results are summarized below in Tables I and 2 <br /> TABLE 1 <br /> (SHERWOOD LABS) <br /> RESULTS OF SOIL SAMPLES COLLECTED ON APRIL 7, 2000(PARTS PER BILLION) <br /> SAMPLE SITE TPHG BENZENE TOLUENE ETHYL- XYLENE MTBE <br /> BENZENE <br /> DTU-T1 N-13' <1 0 <3 0 <30 <3 0 25 16000 <br /> ' DTU-T1 S-13' <1 0 <30 <3 0 <30 <3 0 15300 <br /> DTU-SP-A11A2 <1 0 <30 <30 <3 0 <30 133 <br /> (composite) <br /> ' DTU-SPB <1 0 <3 0 <3 0 <3 0 4 89 <br /> DTU-SPC <1 0 <30 <30 <3 0 7 12200 <br /> TPHg= Total petroleum hydrocarbons as gasoline <br /> MTBE=Methyl tertiary butyl ether(analyzed using EPA method 8020) <br /> <1 0=concentration less than indicated laboratory reporting limit <br /> 1 <br /> Subsurface Soil and Groundwater Assessment ESA1200252 <br /> 1081 W Mendocino Avenue,Stockton,California 2 August 25,2000 <br /> J <br />