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Geological Technics, Inc. Project# 1030.2 <br /> 3780 West Linne Road, Tracy, California <br /> Tracy, Califomia - <br /> PRELIMINARY PRELIMINARY <br /> TEG Project#70524F <br /> BTEX, MTBE, & TPH- asoline EPA method 82608 Analyses of SOIL VAPOR in u k of Va or <br /> SAMPLE NUMBER: Probe SG-7 SG-7. SG-7 SG-8 SG-9 SG-9 <br /> Blank dup t <br /> SAMPLE DEPTH(feet): 5.0 5.0 5.0 5.0 5.0 5.0 <br /> PURGE VOLUME. 1 3 7 1 1 1 <br /> COLLECTION DATE. 5!23/07 5/23/07 SQ3/07 5/23/07 5/23/07 5123/07 5M/07' <br /> COLLECTION TIME: 10:32 11:01 11:22 11:45 12:35 12:56 13:40 <br /> DILUTION FACTOR(VOCs): i 1 1 1 1 1 1 <br /> RL <br /> Benzene 0.08 nd nd nd nd nd nd nd <br /> Toluene 0.10 nd 0.19 0.16 0.13 0.13 0,14 0.14 <br /> Ethylbenzene. 0.10 . nd nd nd nd nd nd nd <br /> m,p-Xylene 0.10 nd 0.19 0.20 0.16 0.13 0.19 0.14 <br /> o-Xylene 0.10 nd nd. nd nd. nd nd nd <br /> Methyl-t-butyl ether(MTBE) 0.10 nd nd nd nd nd nd nd <br /> TPH(gasoline range) 5.0 nd nd nd nd 7.6 7.6 8.1 <br /> 1,1 Diftouroethane(leak check) 10 nd nd nd nd -nd nd nd <br /> Surrogate Recovery: <br /> DBFM 99% 107% 109% 104% 132% - 106% 107% <br /> 1,4-BFB 94% 105%' 99% 101% 122% 93% 99% <br /> nd' Indicates not detected at listed reporting limits <br /> 'RL' Indicates reporting limit at a dilution factor of 1. <br /> Analyses performed in TEG-Northern California's lab <br />