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TABLE 1 HISTORICAL GR( DWATER DATA r Former Discovery Chevrolet r 1.615 11's Street Tracy,California Well. No./ Date Total Depth to Groundwater Floating Chlorinated Elev.' Sampled Depth' Water' Elevation Product TPHg Benzene Toluene Ethylbenzene Xylenes MTBE TPHd O&G Halocarbons _ (ft.) -(ft.) (ft.) (ft.) (pph) (ppb) - (ppb)..... (ppb) (ppb) (ppb) (ppb) (ppb) ppb) 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 45.59 03/08/95 19.5 10.65 34.94 ---- <50 <0.5 <0.5 <0.5 <0.5 na 200 <1,000 na 05/17/95 19.5 10.66 34.93 ---- <50 <0.5 <0.5 <0.5 <2 na <50 <1,000 na 08/07/95 19.5 11.53 34.06 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 <1,000 na 02/20/96 19.5 10.18 35.41 ---- <50 <0.5 <0.5 <0.5 <0.5 na 60 na nd 05/13/96 19.5 10.51 35.08 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 na nd 08/13/96 19.5 11.48 34.11 ---- na na na na na na 60 na nd 11/21/96 19.5 10.46 35.13 ---- na na na na na <5 <50 na nd 03/18/97 19.5 10.33 35.26 ---- <50 <0.5 <0.5 <0.5 <0.5 <5 <50 na na 06/12/97 19.5 10.58 35.01 ---- monitored only; groundwater sample not collected 09/17/97 19.5 10.72 34.87 ---- monitored only; groundwater sample not collected 12/18/97 19.5 10.42 35.17 ---- monitored only; groundwater sample not collected 03/06/98 19.5 9.78 35.81 ---- na <0.5 <0.5 <0.5 <2 na <50 na na 06/05/98 19.5 10.37 35.22 ---- monitored only; groundwater sample not collected 09/08/98 20.0 11.00 34.59 -- <50 <0.50 <0.50 <0.50 <0.50 <2.5 na na na MW-4/ 04/04/97 20.0 10.75 34.81 ---- 415 1.1 0.5 10.9 35.5 na na na na 45.56 06/12/97 20.0 10.89 34.67 ---- <50 05 <0.5 2.0 3.7 <5 na na na 09/17/97 20.0 11.06 34.50 ---- <50 <0.5 <0.5 <0.5 <0.5 <52 na na na 12/18/97 20.0 10.72 34.84 ---- <50 <0.5 <0.5 0.6 <2 <52 na na na 03/06/98 20.0 10.12 35.44 ---- <50 0.8 1.1 1.2 4 <5 na na na 06/05/98 20.0 10.69 34.87 ---- <50 <0.5 <0.5 <0.5 <2 <5 na na na 09/08/98 20.0 11.32 34.24 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.5 na na na MW-5/ 04/04/97 20.0 I0.21 34.93 ---- <50 <0.5 <0.5 <0.5 <0.5 na na na na 45.14 06/17/97 20.0 10.40 34.74 ---- <50 <0.5 <0.5 <0,5 <0.5 <5 na na na 09/17/97 20.0 10.55 34.59 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.5 na na na 12/18/97 20.0 10.22 34.92 ---- <50 <0.5 <0.5 <0.5 <2 <52 na na na 03/06/98 20.0 9.58 3556 ---- <50 <0.5 0.6 <0.5 <2 <5 na na na 06/05/98 20.0 10.16 34.98 ---- <50 <0.5 <0.5 <0.5 <2 <5 na na na 09/08/98 20.0 10.67 34.47 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.5 na na na DW 06/05/98 85.0 4.85 ---- ---- <50 <0.5 <0.5 <0.5 <2 <5 na na na Refer to page 3 for Explanation. 8146.04-7 Page 2 of 3