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TO 1 • Groundwater Monitoring Data and Analytical Results Tosco(Former BP)Service Station#11192 1403 Country Club Boulevard Stockton,California Product WELL IDl DATE JDTW GWE Thickness TPH-G B T E X M'I'KE ITOC*O.) :) (WO .) (ppb) (ppb) (ppb) (ppb) (ppb) (ypb MW-3 11/30/94 26.86 -21.34 -- -- - -- -- (cont) 02/15/95 26.55 -21.03 1,200 10 1.2 85 110 - (D) 02/15/95 -- -- -- 950 9.1 0.99 59 79 -- 04/21/95 24.58 -19.06 -- -- -- -- -- -- 07/19/95 23.69 -18.17 - -- -- -- -- -- -- (PP) 10/20/95 24.11 -18.59 -- 520 5.6 <0.50 2.2 1.4 410 10/20/95 -- -- -- 520 4.7 <0.50 14 12 240 (PP) 04/23/96 20.80 -15.28 - <500 5.7 2 2 l 300 04/23/96 -- -- -- <500 5.1 <0.5 10 5 280 (D) 04/23/96 -- -- -- <500 S.I <0.5 12 4 240 07/12/96 21.50 -15.98 -- -- -- -- -- -- -- 10/18/96 20.67 -15.15 -- 480 3.0 2.5 <1.0 <1.0 300 02/26/98 12.58 -7.06 -- 1,200 1.0 <1.0 <1.0 <1.0 890 07/07/98 12.19 -6.67 6,600 <0.5 <1.0 <1.0 1.1 8,300 (D) 07/07/98 -- -- -- 6,900 <0.5 <1.0 <1.0 1.1 8,500 01/19/99 13.10 -7.58 - 12,000 <5.0 <5.0 <5.0 <5.0 15,000 i 07/14/99 13.11 -7.59 29,000 <5.0 <5.0 20 30 38,000 10/07/99 14.58 -9.06 52,000 <1,0 <1.0 8.7 1.1 35,000 01/20/00 14.95 -9.43 - 310 <0.5 3.4 3.1 2.9 56,000 04/11/00 15.10 -9.58 - 3,000 6.7 <0.5 <0.5 1.1 96,000 07/14/00 12.36 -6.84 -- 3,000 7.6 <0.5 5.2 2.6 120,000 10/26/00 13.95 -8.43 -- 2,800 5.8 <0.5 3.0 1.5 86,000 01/16/01 14.02 -8.50 -- 70,000 14.4 5.93 <5.0 <5.0 111,000 04/12/01 12.66 -7.14 -- 130,000 472 <2.5 <2.5 <7.5 198,000 07/23/01 14.10 -8.58 -- 160,000 <50 <50 <50 <150 174,000 5.68 08/16/01 14.60 -8.92 0.00 -- -- -- -- -- -- 11/09/01 15.56 -9.88 0.00 <5,000 <50 <50 <50 <50 140,0001160,000 12/14/01 15.40 -9.88 -- 26,000 6.4 6.33 31.9 227 28,300 11192.xls/#180288 3 As of 08/08/02