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TABLE 1 HISTORICAL GROUNDWATER DATA Former Discovery Chemlet 1615 It*Street Tracy,California Well.No./ Date Total Depth to Groundwater Floating Eln.` SMWW Depth' Water` Elevation Product TPHg Bm me Toluene Ethyl Chlorinated Xylaes MTBE TPHd OdcG Halewbom (ft) th.) (ft) (tt) (nab) (ppb) (ppb) (Ppb) (PPb) (MMM (pPb) ppb) (ppb) MW-11 09/16/94 20.0 9.97 35.03 -- 640 35 40 6.8 72 as as On na t 45.00 03/09/95 20,0 10.05 34.95 - 3,900 730 510 140 430 0: na na m 05/17/95 20.0 10.02 34.98 -- 400 120 36 12 43 an na an as 08/07/95 20.0 10.98 34.02 -- 1,400 250 170 64 170 oa ' as m m 12/20/95 20.0 9.86 35.14 - 17,000 3,100 2,000 670 2,400 as na an na 02/20/96 20.0 9.25 35.75 -- 3,300 880 310 230 390 na Ma m na 05/13/96 20.0 9.94 35.06 -- 5,800 980 510 320 730 Ms as m m 08/13/96 20.0 10.83 34.17 -- 100 20 17 7.9 18 <5 as m m 11/21/96 20.0 9.87 35.13 -- 510 190 31 22 89 13 m as na 03/18/97 20.0 9.73 35.27 <50 4.0 1.1 0.5 1.8 <5 as as m 06/12/97 20.0 9.97 35.03 - 1,500 310 120 110 380 12 m as as 09/17/97 20.0 10.12 34.88 - 80 8.5 1.8 5.4 14 <52 as n Ma 12/18/97 20.0 9.81 35.19 -- 230 83 5.1 9.6 30 <e.4 m as na MW-2/ 09116/94 19.5 10.07 34.91 -- 7.600 370 ISO 260 680 m m m Ma 44.98 03/08/95 195 10.12 34.86 - 1,000 ISO 47 57 180 m m as m 05/17/95 19.5 A&M 14.90 -- 100 37 II 5.5 21 m no m Ma 08/07/95 19.5 11161119 *09 -- 60 IO 3 2 9 an RAm 12/20/95 19.0 946, 9K00 - 9,700 1,000 150 480 1,100 m m no m 02/20/96 19.5 110 - 8,600 S00 150 430 1,000 as os m m 06/13196 19.5 10.0 3494 8,200 740 160 390 1,200 Ma ns m m 08/13196 19.5 18." 34.03 -- <50 1.1 0.8 0.7 2.8 <5 Ma as Ma 1121/96 19.5 9.97 35.01 -- <50 4.7 1.6 1.5 7 <5 m m na 03/18/97 19.5 9.87 35.11 -- 90 8.7 1.2 3.4 10 <5 m m 06/12/97 19.5 10.08 34.90 - as 2,400 240 39 150 450 15 m m na 09/17197 19.5 10.23 34.75 - 250 4.1 <0.5 1.3 5 6' as na as 12/18/97 19.5 9.92 35.06 - 980 173 17.8 71.8 203 <5'J as na m c c Refer to arca 3 for Eu>looatim. n et46.a-5 Paas t or 3