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Table 6 <br /> Grab Groundwater Analytical Results Summary' <br /> Chevron-Historical Pipeline Portfolio <br /> Pombo Property-1755 West 11th Street <br /> Tracy,California <br /> Concentrations in micrograms per liter(pg/L) <br /> Sample DTW Ethyl- <br /> Boring ID Sample ID Date (feet bgs) TPHd TPHdsg Benzene Toluene benzene Xylenes PAHs <br /> S13-1 SB-1-GW 11/5/2003 7.2 370 190. <0.5 <0.5. <0.5 <1.5 Phenanthrene 0.4 <br /> SB-2 SB-2-GW 11/5/2003 7.1 170 190 <0.5 <0.5 <0.5 <1.5 <0.1 <br /> SB-3 SB-3-GW 11/5/2003 8.8 190 140 <0.5 <0.5 <0.5 <1.5 <0.1 <br /> SB-4 SB-4-GW 11/5/2003 8.0 <57 NA <0.5 <0.5 <0.5 <1.5 <0.1 <br /> SB-5 SB-5-GW 11/5/2003 8.3 88 140 <0.5 <0.5 <0.5 <1.5 <0.1 <br /> SB-6 SB-6-GW 11/5/2003 9.1 110 210 <0.5 <0.5 <0.5 <1.5 <0.1 <br /> SB-7 SB-7-GW 2/25/2004 7.3 170 <50 <0.72 <0.72 <0.72 <22 <0.1 <br /> SB-8 SB-8-GW 2/25/2004 7.1 120 <50 <0.72 <0.72 <0.72 <22 <0.I <br /> SB-9 SB-9-GW 2/25/2004 6.2 <50 <50 <0.72 <0.72 <0.72 <22 <0.1 <br /> SB-10 SB-10-GW 2/25/2004 8.5 220 <50 <0.72 <0.72 <0.72 <22 <0.I <br /> SB-11 SB-11-GW 2/25/2004 11.0 160 <50 <0.72 <0.72 <0.72 <22 <0.1 <br /> Abbreviations: <br /> <=Analyte not detected above the laboratory reporting limit shown <br /> bgs=below ground surface <br /> DTW=Depth to water <br /> NA=Not analyzed <br /> PAHs=Polynuclear aromatic hydrocarbons <br /> TPI-Id=Total petroleum hydrocarbons quantified as diesel(Go-C25) <br /> TPHdsg=Total petroleum hydrocarbons quantified as diesel with a silica gel preparation porcedure <br /> Notes: <br /> Detected concentrations are noted in bold face type. <br /> 1. Samples were collected by SAIC and analyzed by Freidman and Bruya,Inc.for TPHd by EPA Method 8015M;for benzene,toluene,ethylbenzene,and <br /> total xylenes(BTEX)by EPA Method 802113;and for polynuclear aromatic hydrocarbons(PAHs)by EPA Method 8270C with selective ion monitoring(SIM <br /> 2. Reporting limits are raised due to excessive amounts of sediment present in the samples. <br />