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i TABLE FOUR Summary of Chemical Analysis of GROUNDWATER Samples 574 West Grant Line Road, Tracy, California All results in ug/L DATE TPH Ethyl Total Other Well I D SAMPLED Gasoline Benzene Toluene Benzene Xylenes MTBE TAME TBA Compounds MW-5 10/12/00 2 600 < 0 5 <0 5 11 1 6 84 <0 5 52 ND 1/31/01 350 <0 5 <0 5 062 <0 5 15 <0 5 7 6 ND 4/11/01 1 000 <0 5 <0 5 <0 5 <0 5 28 <0 5 26 ND 5/23/01 920 <05 <0 5 3 8 <0 5 66 <0 5 79 ND 7/31/01 240 <0S <05 <0S <05 Z4 <05 35 ND 10/30/01 510 < 0 5 <0 5 <0 5 <0 5 33 <0 5 25 ND 1/29/02 <50 < 05 <05 <0S <05 17 <05 61 NO 4/30/02 130 <05 <05 <05 <05 14 <05 10 ND 7/31/02 280 <05 <05 <0S <05 17 <05 13 ND 9/11/02 160 <0S <05 <05 <05 1s <05 15 ND 10/16/02 110 <05 <05 <05 <05 16 <05 17 ND 10/31/02 97 <05 <05 <05 <05 19 <05 21 NO 12/3/02 51 <05 <05 <05 <05 15 <05 19 ND 1/30/03 99 <05 <05 <05 <05 19 <05 30 ND 4/30/03 91 <05 <05 <05 <05 13 <05 1s N❑ 7/30/03 <50 <05 <O5 <0S <05 13 <05 10 ND 10/29/03 <50 <05 <05 <05 <05 11 <05 11 ND 1/26/04 <50 <05 <05 <05 <05 72 <05 97 ND 4/27/04 74 <05 <05 <05 <05 14 <05 31 ND 7/30/04 <50 <05 <05 <05 <05 49 <05 68 ND 10/28/04 <50 <05 <O5 <05 <05 52 <05 <50 ND I/31/05 87 <05 <05 <05 < 10 89 <05 21 ND 4/29/05 120 <0 5 <0 5 <0 5 < 1 0 10 <0 5 25 ND 8/12/05 <50 <05 <05 <05 <05 32 <05 81 ND 10/28/05 <SO <05 <05 <05 <05 095 <05 <50 ND 1/26/06 <50 <050 <050 <050 <050 093 <050 <50 ND 1 !._ MW 8/24/01 67 <05 <05 <05 <0S 14 <05 <50 ND 1/29/02 <50 <05 <0S <05 <05 077 <05 <50 ND 4/30/02 < 50 <05 <05 <05 <05 <C5 <0S <50 ND 7/31/02 <50 <05 <05 <05 <05 <0S <05 <50 ND 9/11/02 <50 <0S <05 <05 <05 <05 <05 <50 ND 10/16/02 <50 <05 <05 <05 <05 <05 <05 <50 ND 10/31/02 <50 <05 <05 <05 <05 <05 <05 <50 ND 12/3/02 65 1 4 71 1 5 76 <05 <05 <50 ND 1/30/03 <50 <05 <05 <05 <05 <05 <05 <50 ND C!� 4/30/03 <50 <05 <05 <05 <05 <05 <0S <50 ND 7/30/03 <50 <05 <05 <05 055 <05 <05 <50 ND 10/29/03 <50 <05 <05 <05 <05 <05 <05 <50 N0 et 1/26/04 <50 <05 <0S <05 <05 <05 <05 <50 ND Q� 4/27/04 <50 <05 <05 050 075 <05 <05 <50 ND �J(y" 7/30/04 <50 <05 <05 <05 <05 <05 <05 <50 ND 10/28/04 <50 <05 <05 <05 <05 <05 <05 <50 ND 1/31/05 <50 <05 <05 <05 < 10 <05 <05 <50 ND 4/29/05 NOT SAMPLED THIS QUARTER 8/12/05 <50 <05 <05 <05 <05 <05 <05 <50 ND 10/28/OS <50 <05 <05 <05 <05 <0S <05 <50 NO 1/26/06 <50 <050 <050 <050 <050 <0SO <050 <50 ND OHS MCL NE 1 150 700 1,750 13 NE NE VARIES Notes Non detectable concentrations are noted by the less than symbol(<) followed by the detection limit Current analytical data is in bold DHS MCL is the California Department of Health Services maximum contaminant level for dnnkmg water ND-Not Detected above laboratory detection Vimrts NE-DH5 MCLS are not established MTBE=Methyl Leri butyk ether TAME-Tert amyl methyl ether TBA=Tert Butanol =Ethyl t butyl ether(ETRE)detected