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y TABLE FOUR Summary of Chemical Analyoi5 of GROUNDWATER 5ample5 574 West Grant Line Road, Tracy, California All reoult5 in ug/L DATE TPH Ethyl Total Other Well I.D. SAMPLED Gasoline benzene Toluene Benzene Xylenes MTBE TAME TBA Compounds MW-4 10112100 260 17 <0.5 5.0 7,5 140 6.0 <5.0 NI-) 1131101 380 37 <0.5 43 4.3 140 5.8 <5.0 ND 4/11101 680 69 <0.5 36 3.4 280 13 9.8 ND 5123/01 290 31 <0.5 6.4 <0.5 260 14 24 NO 7131/01 210 15 <0.5 3.0 <0.5 200 11 28 NO 10/30/01 810 49 <0.5 29 0.93 290 . 22 9.0 0.54" 1/29102 630 84 <2.0 32 <2.0 510 19 <20 NO 4/30102 290 25 <2.0 <2.0 <2.0 540 25 <20 ND 7/31/02 420 30 <1.0 50 1.6 390 19 <10 NO 9111/02 61 1.2 <0.5 <0.5 <0,5 62 2.6 6.1 ND 10/16/02 <50 <0.5 <0.5 <0.5 <0,5 51 1.3 <5.0 ND 10/31/02 <50 <0.5 <0.5 <0.5 <0.5 59 <0.50 <5.0 ND 1213102 <50 0.53 <0.5 <0.5 <0.5 50 2.1 5.8 ND 1130103 72 2.0 <0.5 <0.5 <0.5 31 1.7 13 ND 4/30/03 <50 <0.5 <0.5 <0.5 <0.5 17 <0.5 <0.5 ND MW-5 10112100 2,600 <0.5 <0.5 11 1.6 84 <0.5 52 ND 1131101 350 <0.5 <0.5 0.62 <0.5 15 <0.5 7.6 ND 4/11/01 1,000 <0.5 <0,5 c0.5 <0.5 28 <0.5 26 ND 5/23/01 920 <0.5 <0.5 3.8 <0.5 66 <0.5 79 ND 7/31101 240 <0,5 <0.5 <0.5 <0.5 24 <0.5 35 ND 10/30/01 510 <0.5 <0.5 <0.5 <0,5 33 <0.5 25 ND 1129/02 <50 <0.5 <0.5 <0,5 <0.5 17 <0.5 6.1 ND 4/30/02 130 <0.5 <0.5 <0,5 <0.5 14 <0,5 10 ND y 7131/02 280 <0,5 <0.5 <0.5 <0,5 17 <0,5 13 ND li 9/11102 160 <0.5 <0.5 c0.5 <0.5 15 <0.5 15 ND 10116102 110 <0.5 <0.5 <0,5 <0.5 16 <0.5 17 ND 10131102 97 <0.5 <0.5 <0,5 <0.5 19 <0.5 21 ND 12/3/02 51 <0,5 <0.5 <0.5 <0.5 15 <0.5 19 ND 1/30103 99 <0.5 <0.5 <0.5 <0.5 19 <0.5 30 ND 4130/03 91 <0.5 <0.5 <0.5 <0.5 13 <0.5 15 ND MW-6 8124/01 67 <0.5 <0.5 <0.5 <0.5 1.4 <0.5 <5.0 ND 1/29102 <50 <0.5 <0.5 <0.5 <0.5 0.77 <0.5 <5.0 ND 4/30/02 <50 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <5.0 ND 7/31102 <50 <0.5 <0.5 c0.5 <0.5 <0.5 <0.5 <5.0 NO 9111102 <50 <0.5 <0.5 <0.5 <0.5 <0,5 <0.5 <5.0 ND 10/16/02 <50 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <5.0 ND 10/31/02 <50 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <5.0 ND 12/3102 65 1.4 7.1 1.5 7.6 <0.5 <0.5 <5.0 ND } 1/30/03 <50 <0.5 <0.5 <05 <0.5 <0.5 <0.5 <5.0 NO 4130/03 <50 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <5.0 ND Nate': Non-detectable concentrations are roted by the less than symbol(<) followed by the detecVon limit. Current analytical data io in bold. DH5 MCL i5 the California Departmert of Health services maximum contaminant level for drinking water. ND=Not Detected above laboratory detection limits. NE=DH5 MCLS are not estaKohed. MTDE=Methyl tert-butyl-ether TAME=Tert-amyl methyl ether TBA=Tert Dutarol "=Ethyl-t-butyi ether(E73E)detected.