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TABLE 2 Groundwater-Cumulative Analyses Chevron-Historical Pipeline Portfolio Pombo Property-1755 West 11th Street. Tracy,California Concentrations in micrograms per liter(ftg/L) Ethyl- Sample ID Date TPHg TPHd TPHdsg Benzene Toluene benzene Xylenes MtBE PAHs' GMX-6-GGW' 9/22/1999 NA NA NA <0.5 <0.5 <0.5 <0.5 <1 Flunr~ 0.2 Ph-thmw 03 GMX-25-GGW' 5/16/2000 <50 86 <50 <0.5 <0.5 <0.5 <0.5 NA <0.1 GMX-29-GGW' 10/12/2000 140 660/3603 160 0.6 2.6 1.6 4 NA 0.1 Phe-th-- 0.1 GMX-30-GGW' 10/12/2000 <50 300 <50 <0.5 0.8 <0.5 1.1 NA <0.1 GMX-3I-GGW' 10/12/2000 <50 560 <50 <0.5 <0.5 <0.5 1.9 NA <0.1 GMX-33-GGW' 10/13/2000 <50 140 <50 <0.5 <0.5 <0.5 <0.5 NA <0.1 SB-1-GW 11/5/2003 NA 370 190 <0.5 <0.5 <0.5 <1.5 NA Ph-ih- 0.4 SB-2-GW 11/5/2003 NA 170 190 <0.5 <0.5 <0.5 <1.5 NA <0.1 SB-3-GW4 11/5/2003 NA 190 140 <0.5 <0.5 <0.5 <1.5 NA <0.1 SB4-GW 11/5/2003 NA <57 NA <0.5 <0.5 <0.5 <1.5 NA <0.1 SB-5-GW4 11/5/2003 NA 88 140 <0.5 <0.5 <0.5 <1.5 NA <0.1 SB-6-GW6 11/5/2003 NA 110 210 <0.5 <0.5 <0.5 <1.5 NA <0.1 SB-7-GW' 2/25/2004 NA 170 <50 <0.75 <0.75 <0.75 J25 NA <0.1 SB-8-GW4 2/25/2004 NA 120 <50 <0.75 <0.75 <0.75 <25 NA <0.1 SB-9-GW 2/25/2004 NA <50 <50 <0.75 <0.75 <0.75 <25 NA <0.1 SB-10-GW4 2/25/2004 NA 220 <50 <0.75 <0.75 . <0.75 <25 NA <0.1 SB-II-GW° 2/25/2004 NA 160 <50 <0.75 <0.75 <0.75 <25 NA <0.1 Water Quality Objectives: (WQOs) 21 56-140 56-140 l 150 300 1,750 13 Abbreviations <=Analyte not detected above the laboratory reporting limit shown MtBE=methyl tert-butyl ether NA=Not analyzed PAHs=Polynuclear aromatic hydrocarbons TPHc=Total petroleum hydrocarbons quantified as crude oil(C,o-C16) TPHd=Total petroleum hydrocarbons quantified as diesel(C,o-Cr,) TPHdsg=Total petroleum hydrocarbons quantified as diesel with a silica gel preparation porcedure TPHg--Total petroleum hydrocarbons quantified as gasoline(C6-C�,) Notes: Detected concentrations are noted in bold face type. 1. Samples were collected by Geomatrix Consultants,Inc.and analyzed by Friedman and Bruya,Inc.for TPHg,TPHd,and TPI-lc by EPA Method 8015 modified;for benzene,toluene,ethylbenzene,and total xylenes(BTEX)and MtBE by EPA Method 802613; and for PAH by EPA Method 8270C SIM. 2. Only Detected PAHs are shown(fluorene and phenanthrene) 3. Unfiltered/filtered sample result. The filtered sample was passed through a 0.7-micron glass fiber filter by the laboratory prior to extraction and analysis. 4. Samples were collected by SAIC and analyzed by Freidman and Bruya,Inc.for TPHd by EPA Method 8015M;for benzene,toluene,ethylbenzetic,and total xylenes(BTEX)by EPA Method 8021B;and for polynuclear aromatic hydrocarbons(PAHs)by EPA Method 8270C with selective ion monitoring(SIM). 5. Reporting limits are raised due to excessive amounts of sediment present in the samples. Sources: Geomatrix,2000. Report of Additional Soil and Groundwater Investigation,Pombo Property,Tracy,California,December. SAIC,2005. Soil and Groundwater Investigation Report,Pombo Property,Tracy,California,January.