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. s TABLE 1 HISTORICAL GROUNDWATER DATA Former D19cavery Chevrolet 1615 Ilia Shred Tracy,California Well. No./ Date Total Depth to Groundwater Mating Chlorinated ' Etev.r Sampled Depth` Water' Elevation product TPH9 Benzene Toluene EthylbfflMe Xylarrw MTBE TPHd O&G Halocarbons (ft ) (ft.) (ft.) (ft.) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb! (pph) MW-3/ 09/16/94 19.5 10.49 35.10 - <SO <0.5 <0.5 <0.5 <0.5 Da <50 10,00 m 45.59 03/08/95 19.5 10.65 34.94 - <50 <0.5 <0.5 <0.5 <0.5 na 200 <1,00 Da + 05/17/95 19.5 10.66 34.93 - <50 <0.5 <0.5 <0.5 <2 m <50 <1,00 na ! 08/07/95 19.5 11.53 34.06 - <50 <0.5 <0.5 <0.5 <0.5 na <50 <1.00 na 02/20/96 19.5 10.18 35.41 - <50 <0.5 <0.5 <0.5 <0.5 na 60 na od 05113/96 19.5 10.51 35.08 - <SO <0.5 <0.5 <0.5 <0.5 Da <50 na ad 08/13/96 19.5 11.48 34.11 - na na as na na at 60 Da ad 11/21/96 19.5 10.46 35.13 - na na na na as <5 <50 Da ad 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 Dot collected MW4/ 04/04/97 20.0 10.75 34.81 - 415 1.1 0.5 10.9 35.5 as na na oa 45.56 06/12/97 20.0 10.89 34.67 -- <50 0.5 <0.5 2.0 3.7 <5 na as m 09/17/97 20.0 11.06 34.50 - <50 <0.5 <0.5 <0.5 <0.5 <51 na as OR 12/18/97 20.0 10.72 34.84 -- <50 <O.S <0.5 0.6 <2.0 <S' na na na MW-5/ 04/04/97 20.0 10.21 34.93 - <50 <0.5 <0.5 <0.5 <0.5 na na rra an ` 45.14 06/17/'97 20.0 10.40 34.74 - <50 <0.5 <0.5 <0.5 <0.5 <5 na Da m 09/17/97 20.0 10.55 34.59 -- <50 <0.5 <0.5 <0.5 <0.5 <5z Da Da na 12/18/97 20.0 10.22 X92 - <50 <O.5 <0.5 <0.5 <2.0 <52 as na Da Trip Blank 06/12/97 - - - -- <50 <0.5 <0.5 <0.5 <0.5 <5 na as Da 09/17/97 -. - - - <50 <0.5 <0.5 <0.5 <0.5 <5 na na na Refer to page 3 for Explanation. it46.Q43 Pap 2 of 3