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Table 1 Groundwater Monitoring Data and Analytical Results Tosco(Former BP Oil)Service Station#11195 16500 South I-5 Lathrop,California WELL ID/ DATE DTW S.I- GWE TPH-D TPH-G R T E X MTBE TOC*(ft•) (ft.) (ft.bgs) (msl) (ppb) (ppb) (PPh) (ppb) (ppb) (Ppb) (PPh) MW-1R 8.12 09/03/98 7.76 4.0-14.0 0.36 - 210 ND ND' ND3 1.03 210 12/23/98 8.22 -0.10 -- ND ND ND' ND' ND ND 12/31/98 8.25 -0.13 -- 470 ND3 ND3 ND3 ND 490 03/22/99 7.14 0.98 -- 1,800 ND' ND3 ND' ND 1,900 8.12 05/20/99 7.14 0.98 ND ND ND ND ND ND/3.52' 08/11/99 8.41 -0.29 -- ND ND ND ND ND 919/1,100¢ 11/19/99 8.72 -0.60 -- ND3 17 ND3 ND3 ND3 9,400114,000' 02/22/00 6.39 1.73 -- ND ND- ND ND ND 11.7/13.6° 05/05/00 6.83 1.29 - ND ND ND ND ND ND/ND' 08/28/00 8.23 -0.11 -- ND ND ND ND ND 1,76012,120' I1/13/00 8.59 -0.47 - ND' ND' ND' ND' ND3 44,400/37,000' 02/09/01 8.37 -0.25 - ND3 ND3 ND3 ND3 ND3 43,400137,100' 05/11/01 7.78 0.34 -- ND ND ND ND ND 7,10016,530' 08/10/01 8.75 -0.63 <1,200 <12 <12 <12 <12 21,000/21,000' 11/21/01 9.28 -1.16 <1,200 <12 <12 <12 <12 22,000122,000' 02/07/02 7.26 0.86 - <50 <0.50 <0.50 <0.50 <0.50 4,000/4,900' 05/23/0213 8.25 -0.13 <2,500 <25 <25 <25 <50 -44,000' 08/15/0216 . 8.70 -0.58 52014 <5.0 <5.0 <5.0 <10 2,0410 MW-11 7.38 09/03/98 6.98 4.0-14.0 0.40 - ND ND ND3 ND3 ND ND' 12/23/98 -- - - - -- - - 12/31/98 7.55 -0.17 - 350 ND3 ND' ND3 ND 400 03/22/99 6.25 1.I3 ND ND3 ND ND3 ND 59 7.38 05/20/99 6.27 1.11 - ND 0.989 ND ND ND 904/1,780' 08/11/99 7.61 -0.23 -- ND ND ND ND ND 16,200/16,000' 11/19/99 8.00 -0.62 -- ND3 15 ND3 ND3 ND3 14,000/20,0001 02/22/00 5.88 1.50 - ND ND ND ND ND ND/2.681 05/05/00 6.01 1.37 -- ND ND ND ND ND 01,490/1,640' 08/28/00 7.43 _ -0.05 ND ND ND ND ND 4,660/2,7701 11/13/00 7.62 -0.24 -- ,.n, ND ND ND ND ND 135/1371 11195,x1sA'I80175 ` A k` 11,5/02