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TABLE 1 <br /> HISTORICAL GROUNDWATER DATA <br /> Former Discovery Chevrolet <br /> 1635 11th Street <br /> Tracy, California <br /> Well. No./ Date Total Depth to Groundwater Floating Chlorinated <br /> Elev.l Sampled Depths Waters Elevation Product TP13g Benzene Toluene Ethylbenzene Xylenes MTBE TPHd O&G Halocarbons <br /> (ft.) (ft.) (ft.) (ft.) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW-2/ 12/18/97 19.5 9.92 35.06 ---- 980 173 17.8 71.8 203 <52'5 na na na <br /> 44.98 03/06/98 19.5 9.25 35.73 ---- 1,000 160 22 80 240 10 na na na <br /> 06/05/98 19.5 9.85 35.13 ---- 80 12 1.0 4.4 14 <5 na na na <br /> MW-3/ 09/16/94 19.5 10.49 35.10 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 10,00 na <br /> 45.59 03/08/95 19.5 10.65 34.94 ---- <50 <0.5 <0.5 <0.5 <0.5 na 200 <1,00 na <br /> 05/17/95 19.5 10.66 34.93 ---- <50 <0.5 <0.5 <0.5 <2 na <50 <1,00 na <br /> 08/07/95 19.5 11.53 34.06 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 <1,00 na <br /> 02/20/96 19.5 10.18 35.41 ---- <50 <0.5 <0.5 <0.5 <0.5 na 60 na nd <br /> 05/13/96 19.5 10.51 35.08 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 na nd <br /> 08/13/96 19.5 11.48 34.11 ---- na na na na na na 60 na nd <br /> 11/21/96 19.5 10.46 35.13 ---- na na na na na <5 <50 na nd <br /> 03/18/97 19.5 10.33 35.26 ---- <50 <0.5 <0.5 <0.5 <0.5 <5 <50 na na <br /> 06/12/97 19.5 10.58 35.01 ---- monitored only; groundwater sample not collected <br /> 09/17/97 19.5 10.72 34.87 ---- monitored only; groundwater sample not collected <br /> 12/18/97 19.5 10.42 35.17 ---- monitored only; groundwater sample not collected <br /> 03/06/98 19.5 9.78 35.81 ---- na <0.5 <0.5 <0.5 <2 na <50 na na <br /> 06/05/98 19.5 10.37 35.22 - -- monitored only; groundwater sample not collected <br /> MW-4/ 04/04/97 20.0 10.75 34.81 ---- 415 1.1 0.5 10.9 35.5 na na na na <br /> 45.56 06/12/97 20.0 10.89 34.67 ---- <50 0.5 <0.5 2.0 3.7 <5 na na na <br /> 09/17/97 20.0 11.06 34.50 ---- <50 <0.5 <0.5 <0.5 <0.5 <52 na na na <br /> 12/18/97 20.0 10.72 34.84 ---- <50 <0.5 <0.5 0.6 <2 <5, na na na <br /> 03/06/98 20.0 10.12 35.44 ---- <50 0.8 1.1 1.2 4 <5 na na na <br /> 06/05/98 20.0 10.69 34.87 ---- <50 <0.5 <0.5 <0.5 <2 <5 na na na <br /> MW-5/ 04/04/97 20.0 10.21 34.93 ---- <50 <0.5 <0.5 <0.5 <0.5 na na na na <br /> 45.14 06/17/97 20.0 10.40 34.74 ---- <50 <0.5 <0.5 <0.5 <0.5 <5 na na na <br /> 09/17/97 20.0 10.55 34.59 ---- <50 <0.5 <0.5 <0.5 <0.5 <52 na na na <br /> Refer to page 3 for Explanation. <br /> 8146.04-5 Page 2 of 3 <br />