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Table 2-Groundwater Chemical Analytical Data Former Unocal Service Station#0187 437 East Miner Avenue Stockton,California Sample Sample TOC DTW GWE TPHg Benzene Toluene Ethylbenzene Xylenes MtBE TBA ETBE DIPE TAME No Date (feet MSL) (feet) (feet MSL) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) U-10(28')"1 617100 1164 2449 -1285 <50 076 3 3 <0 50 30 4 717 7"' <100 <2 0 <2 0 <2 0 (Z U-10(114')131 617100 1164 2449 -12 85 <50 072 2 7 <0 50 26 2 912 3"' <100 <2 0 <2 0 <2 0 '1.0_?pis U-11 6!7/00 12 55 25 76 -1321 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <100 <2 0 <2 0 <2 0 U-12(30')1�1 617100 1241 2592 -13 51 440141 64 5 1 4 5 7 0 2313 51i' <100 <2 0 <2 0 <2 0 110 11 1!1 <100 <2 0 <2 0 <2 0 U-12(114')13/ 6/7100 12 41 25 92 -13 51 390458 5 1 3 4 6 9 1613 l _ U-13(28')1�1 617100 1228 25 53 -1325 60014' 200 17 21 71 5013 911 <100 <2 0 <2 0 <2 0 U-13(69')1'1 617100 1228 25 53 -13 25 8001st 430 21 1 3 87 1101<2 01i1 <100 <2 0 <2 0 <2 0 1 rip Blank 617100 ---- ---- ---- <50 <0 50 <0 50 <0 50 <0 50 <2 5 ---- ---- ---- ---- Exnlanaeian. Analytical Method TPHg=Total Petroleum Hydrocarbons as gasoline TPHg,BTEX,and MtBE by DHS LUrT Method BTEX=Benzene Toluene Ethylbenzene Xylenes Oxygenates by EPA Method 8260A MtBE=Methyl tert butyl ether I TRA=Tert butyl alcohol "MtBE by EPA Method 8260A ET BE ett-butyl ether 121 Sample collected using disposable bailer from top of water column ET BE Ethyl tE=Di Ethyl t opyl ether 13'Sample collected using bomb sampler from bottom of water column "'Chromatogram pattern gasoline C6 C12 TAME=Tent-amyl methyl ether TOC=Top of casing 151Chromatogram pattern gasoline C6 C 12 and unidentified hydrocarbons<C6 DTW=Depth to water GWE=Groundwater elevation Analytical Labocatory MSL—Mean sea level Sequoia Analytical(ELAP k 127 1) I ppb=parts per billion i 24004205-1