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Taliksil Groundwater Monitoring 'w and Analytical Results Tosco(Former BP Oil)Service Station#11195 16500 South 1-5 Lathrop,California WELL ID/ DATE DTW S.I. GWE TPH-D TPH-G BT E X MTBE (PP (Ppb) (ppb) (ppb) (ppb) b) (Ppb) (Ppb) ITOC*(ft.) A) (ft.bgs) (MSP MW-4 (D) 09115/93 -- 9.5-24.5 -- 16,000 18 ND3 1,000 1,200 1.4 150 112 -1.35 3,200 6.2 (cont) 01/12/94 10.38 05/12194 9.70 -0.67 160 ND 2.5 0.7 ND 10/07/94 10.46 -1.43 13,000 11 2,1 1,100 33 12108/94 10.62 -1.59 5,400 20 27 490 54 460 02121195 8.29 0.74 11,000 ND ND' 990 - 11,000 ND3 ND3 990 450 (D) 02/21/95 -- 98 ND ND ND ND 06/09195 7.79 1.24 0.52 22 2.5 (D) 06/09/95 -- -- 810 ND 3 3 ND' 08131/95 9.73 -0.70 2,500 ND ND 3 130 14 ND' (D) 08/31/95 -- -- -- 2,800 ND ND 160 17 10.30 -1.27 1,100 1,800 ND ND 56 3.6 ND 11/02195 -- -- 1,300 ND' ND3 38 2.7 ND3 (D) 11/02/95 -- 02128/96 6.87 2.16 2,700 2.6 1.0 220 75 N D3 11 530 ND ND3 ND3NDND.. 09/05/96 9.19 -0.16 110 ND NDS ND3 ND ND3 (D) 09/05/96 -- -- ND3 1.3 ND ND3 03/25/97 6.40 2.63 590 ND ND3 ND3 ND 60,000 10115/97 10.59 -1.56 1,600 3.6 ND3 ND3 ND3 18,000 01/15/98 9.37 -0.34 19,000 7.3 (D) 05/07/98 -- 19,000 6.6 N D.1 ND ND3 18,000 05/07/99 6.30 2.73 1,100 ND ND NW ND 1,100 09/03/99 8.58 0.45 2,400 ND ND' 2.8 ND 680 12123/98 9.09 -0.06 34,000 ND3 ND3 ND3 ND 36,000 12/31/98 9.10 -0.07 29,000 ND.3 NUI ND3 ND 40,000 03/22199 7.85 1.18 4,600 ND3 ND3 ND3 ND 4,400 14.32 09115/98 8.75 5.57 590 ND 3.4 ND ND 990, 9.03 05/20/99 7.90 1.13 178 ND ND ND ND 3,120/8,230 08/11199 9.42 -0.39 297 ND ND ND ND 437/5801 11/19/99 INACCESSIBLE-PARKED OVER -- -- 02/22100 7.25 1.78 1209 1.59 ND ND ND 333/382 05/05100 7.54 1.49 ND ND ND 151/302 ND ND ND 27.6/29.71 09128100 9.08 -0.05 61.2 1.53 ND ND 11113100 9.40 -0.37 ND ND ND ND ND 13.1111.0' As of 11/19/02 I 1195.00 18017.5 5