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Table 1 Groundwater Monitoring Data and Analytical Results Tosco(Former BP Oil)Service Station #1 1 195 16500 South I-5 Lathrop,California WELL IDI DATE DTW S.I. GWE TPH-D TPH-G B T E X MTBE TOC*(ft.) (ft.) (ft.hgs) {►nsl) (PPh) (ppb) (PPh) (PPh) (PPh) (PPh) (Ppb) MW-3 10/15/97 11.32 8.0-23.0 -1.53 1.500 9.1 2.3 320 72.5 8,700 (cont) (D) 10/15/97 -- -- 1,400 8.4 1.5 250 57 7.900 01/15/98 f0.14 -0.35 - 24,000 20 N1J` ND' ND' 21.000 05/07/98 7.10 2.69 -- -- _ -- 09/03/98 9.32 0.47 81.000 ND' ND3 360 100 78.000 (D) 09/03/98 -- 66,000 ND' ND' 350 100 73.000 12/23/98 9.98 -0.19 62.000 4.2 ND' 210 5.1 77.000 12/31/98 TNACCESSTBLE-PAVED OVER -- -- __ -- 03/22/99 8.60 1.19 12.000 ND' ND' ND' ND 12,000 15.10 09/15/98 9.50 5.60 4,100 ND 1 1 370 50 23.000' 9.79 05/20/99 8.61 1.18 - ND ND ND ND ND 2,89014.680 08/11/99 10.27 -0.48 - ND' ND' ND' 29.9 ND` 47,100/61.000' 11/19/99 10.29 -0.50 3,8008 46 ND' 72 380 32,000/38.000' 02/22/00 8.01 1.78 312,0 6.34 ND 3.72 12.2 3,490/3,510' 05/05/00 8.31 1.48 - ND' ND' ND' ND' ND' 102.490/2,4 10' 08/28/00 9.81 -0.02 -- ND' ND' ND' ND' ND' 83.800178,600' 11/13/00 10.21 -0.42 ND' ND' ND' ND' ND' 55.100145,800' 02/09/01 9.95 -0.16 - ND' ND' ND' ND' ND' 8,400/11.700' 05/11/01 9.26 0.53 ND' ND' ND' ND' ND' 7.470/7,930' 08/10/01 10.28 -0.49 110' <0.50 1.6 3.0 3.0 2,600/5.200' 11121/01 10.81 -1.02 <250 <2.5 <2.5 <2.5 <2.5 3.60015,500' 02/07/02 8.81 0.98 <1,000 <10 <10 <10 <10 5,200/3,800' 05/23/0213 9.74 0.05 - <1,300 <13 <13 21 <25 42,600' 08/15/0216 10.19 -0.40 75014 <5.0 <5.0 <5.0 <10 820 MW-4 9.03 12/21/925r 11.06 9.5-24.5 -2.03 ND 10,000 ND' 3.5 300 540 - 05/17/93 8.25 0.78 6,600 7.7 3.3 840 1.000 - 09/15/93 9.64 -0.61 -- 16,000 Nd' ND' 1,000 1,300 (D) 09/15/93 -- -- - 16.000 f8 ND' 1.000 1,200 - 01/12/94 10.38 -1.35 3,200 6.2 1.4 150 112 - 05/12/94 9.70 _ -0.67 160 ND 2.5 0.7 ND k 5/02 -- N AM 111951l" n'160175 jR/1