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GEOMATRIX <br /> TABLE2 <br /> HISTORICAL AND RECENT GRAB GROUNDWATER ANALYTICAL RESULTS' <br /> Pombo Property <br /> 1755 West 11th Street <br /> Tracy, California <br /> Concentrations in micrograms per liter(pg/1) <br /> TPHd TPHd <br /> Sample (without silica (with silica gel Ethyl- <br /> Sample ID Date TPHg gel procedure) procedure) Benzene Toluene benzene Xylenes MTBE PAHs <br /> GMX-6-GGW 9/22/99 NA NA NA <0.5 <0.5 <0,5 <05 <1 Flr 0.2 <br /> Phu 0.3 <br /> GMX-25-GGW 5/16/00 <50 86 <50 <0.5 <0.5 <0.5 <0.5 NA <0.1 <br /> GMX-29-GGW 10/12/00 140 660/360' 160 0.6 2.6 1.6 4 NA Fir 0.1 <br /> Phn 0.111 <br /> GMX-30-GGW 10/12/00 <50 300 <50 <0.5 0.8 <0.5 1.1 NA <0.1 <br /> GMX-31-GGW 10/12/00 <50 560 <50 <0.5 <0.5 <0.5 1.9 NA <0.1 <br /> GMX-33-GGW 10/13/00 <50 140 <50 <0.5 <0.5 <0.5 <0.5 NA <0.1 <br /> Notes: <br /> Samples collected by Geornatrix Consultants,Inc.and analyzed by Friedman and Bmya,Inc. for total petroleum hydrocarbons(TPH)quantified as <br /> gasoline(TPHg),and TPH quantified as diesel(TPHd)by EPA Method 8015 Modified;benzene,toluene,ethylbenzene,and total xylenes(BTEX); <br /> and methyl tertiary butyl ether(MTBE)by EPA Method by 826013;and for polynuclear aromatic hydrocarbons(PAHs)by EPA Method 8270SIM_ <br /> Only detected PAHs shown here.TPHd analysis was performed both with and without a silica gel preparation procedure on sample extracts(EPA <br /> Method 3630),prior to analysis. <br /> ' Unfiltered/filtered sample result. The filtered sample was passed through a 0.7-micron glass fiber filter by the laboratory prior to extraction <br /> and analysis. <br /> Abbreviations: <br /> NA=Not Analyzed <br /> Fir=Fluorene <br /> Plan=Phenanthrene <br /> tdcc_sa(eW00os%447.0031pombo table i-2-3xis <br />