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L � u Table B-4 LHistoric Groundwater Analytical Results Western Oil and Spreading,Inc.,Acampo Plant Site,Acampo,California dug of Sample Location Sample Date TPHDZ TPHK3 TPHG4 B5 T5 E5 X5 MTBES MW-6 9/19/07 240 NA NA NA NA NA NA NA (cont'd) 12/28/07 210 NA NA NA NA. NA NA NA 3/27/08 840 NA NA NA NA NA NA NA 6/25/08 370 NA NA NA NA NA NA NA 4 9/16/08 430 NA NA NA NA NA NA NA 12/17/08 200 NA <50 <0.50 <0.50 <0.50 1 <0.50 NA w/silica gel cleanup 12/17/08 <50 NA not subjected to silica gel cleanup NA 3/3/09 130 NA <50 <0.50 <0.50 <0.50 <0.50 NA w/silica gel cleanup 3/3/09 <50 NA not subjected to silica gel cleanup NA 6/4/09 110 NA NA NA NA NA NA NA w/silica gel cleanup 6/4/09 <50 NA NA NA NA NA NA NA 1/19/10 85 NA NA NA NA NA NA NA w/silica gel cleanup 1/19/10 <50 NA NA NA NA NA NA NA { MW-7 9/18/06 <62 NA NA <0.5 <0.5 <0.5 <0.5 NA �• 12/18/06 <50 NA NA <0.5 <0.5 <0.5 <0.5 NA 3/30/07 47 NA NA NA NA NA NA NA 6/28/07 <47 NA NA NA NA NA NA NA 9/19/07 <47 NA NA NA NA NA NA NA 12/28/07 <48 NA NA NA NA NA NA NA 3/27/08 <48 NA NA NA NA NA NA NA 6/25/08 <47 NA NA NA NA NA NA NA 9/16/08 <48 NA NA NA NA NA NA NA f 12/17/08 <50 NA <50 <0.50 <0.50 <0.50 <0.50 NA (r. 3/3/09 <50 NA <50 <0.50 <0.50 <0.50 <0.50 NA 6/4/09 <50 NA NA NA NA NA NA NA 1/19/10 <50 NA NA NA NA NA NA NA 1. ug/L: micrograms per liter 2. TPHD: Total Petroleum Hydrocarbons as Diesel . TPHK: Total Petroleum Hydrocarbons a Kerosene . TPHG: Total Petroleum Hydrocarbons as Gasoline 5. B:Benzene,T:Toluene,E:Ethylbenzene,X:total Xylenes,and MTBE: Methyl Tertiary-Butyl Ether 6. <: "less than"the stated method reporting limit . NA: Not Analyzed 8. NS: Not Sampled 1 \\Eureka\Projects\2007\007152-WOS\PUBS\data\ SHN Consulting Engineers i 20100324-IstHalf2010HistoricData.xls\B-4 B-14 &Geologists,Inc.