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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER SAMPLING BP OIL COMPANY SERVICE STATION NO.11193 3202 WEST HAMMER LANE,STOCKTON,CALIFORNIA ALISTO PROJECT NO.10-136 WELL DATE OF CASING DEPTH TO GROUNDWATER TPH-G TPH-D TPH B T E X MTBE HVOC DO LAB ID SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (ugA) (ugA) (ugA) (ug4) (ugA) (ug4) (ugA) (ugA) (ug4) (ppm) MONITORING (Feet) (Feet) (Feet) MW-3 12/21/92 5.15 21.52 -16.37 170 --- --- 2.8 ND<0.5 ND<0.5 ND<0.5 - - MW-3 04/04/93 5.15 18.59 -13.44 270 -- --- 23 ND<0.5 ND<0.5 ND<0.5 PACE MW-3 04/26/93 5.15 18.34 -13.19 --- --- - -- - - MW-3 10/00/93 5.15 19.10 -13.95 920 .-- 80 ND<0.5 ND<0.5 1.0 -- - PACE MW-3 01/07/94 5.15 18.62 -13.67 130 12 ND<0.5 ND<0.5 1.5 --- - - PACE MW-3 04120/94 5.15 18.07 -12.92 99 (d) --- --- 2.6 ND<0.5 ND<0,5 ND<0.5 -- -•- 3.8 PACE MW-3 04/25/94 5.15 18.04 -12.89 -- --- --- --- --- -- -- ... --- -'- - MW-3 07/28/94 5.15 18.50 -13.35 360 --- --- 46 0.9 0.9 2.1 - - 3.6 PACE MW-3 12109/94 5.15 18.99 -13.84 610 --- ••. 140 2.9 3.4 2.8 --- 3.9 PACE MW-3 03103195 5.15 17.62 -12.47 ND<50 --- 2.3 ND<0.50 ND<0.50 ND<1.0 - 4.7 ATI MW-3 04112/95 5.15 16.34 -11.19 ND<50 - ... 0.75 0.89 ND<0.50 ND<1.0 - 8.1 ATI „ MW-3 07120/95 5.15 16.72 -11.57 230 --- 4.5 ND<0.50 ND<0.50 ND<1.0 -- --- 7.9 ATI MW-3 1192M 5.15 17.56 -12.41 ND<50 --- --- 0.81 ND<0.5 0.51 ND<1.0 640 --- 4.2 ATI MW-3 01/16/96 5.15 16.90 -11.75 86 --- --- ND<0.50 ND<0.50 ND<0.50 ND<1.0 270 --- -- ATI MW-3 04/22/96 5.15 14.84 -9.69 ND<50 --- -- ND<0.5 ND<7 ND<1 ND<4 29 --- --- SPL MW-3 07/12/96 5.15 15.13 -9.98 ND<50 --- --- ND<0.5 ND<1 ND<1 ND<1 ND<10 27 SPL MW-4 12/21/92 5.43 21.68 -16.25 110 - --- ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- --- - MWA 04/04193 5.43 18.80 -13.37 180 --- --- 1.1 ND<0.5 N0<0.5 0.9 ND (e) - PACE OG1 (c) 04104193 --- --- --- 310 1.9 ND<0.5 ND<0.5 0.9 - - - PACE MW-4 04/26/93 5.43 18.55 -13.12 --- ND<50 ND<< --- - -- MW-4 10/05/93 5.43 19.30 -13.87 140 ND<50 ND<5000 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- ND (e) -- PACE QC-1 (c) 10!05!93 --- --- --- 160 --- --- ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- PACE MW-4 01107/94 5.43 19.05 -13.62 100 --- --- ND<o,5 ND<O.5 ND<0.5 ND<0.5 - - PACE MW-4 04120/94 5.43 18.31 -12.88 74 --- ... ND<0.5 ND<0.5 ND<0.5 1.3 --- --- 4.1 PACE l MW-4 04!25194 5.43 18.28 -12.85 -- .-- ... - - --- --- ... - MW-4 07!28/94 5.43 18.71 -13.28 66 •-- -- ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- --- 4.0 PACE MW-4 12109/94 5.43 19.20 -1377 50 --- --- ND<0.5 ND<0.5 ND<0.5 ND<1 --- - 4.4 PACE MW-4 03!03195 5.43 17.87 -12.44 ND<50 ... --- ND<0.50 ND<0.50 ND<0.50 ND<1.0 --- - 4.6 ATI MW-4 04112/95 5.43 16.59 -11.16 ND<50 --- -•- ND<0.50 ND<0.50 ND<0.50 ND<1.0 --- 7.9 ATI MW-4 07/20/95 5.43 16.97 -11.54 ND<50 .-- ND<0,50 ND<0.50 ND<0.50 ND<1.0 --- 4.6 ATI MW-4 11/02/95 5.43 17.81 -12.38 ND<50 --- --- ND<0.5 ND<0.5 ND<0.5 ND<1.0 ND<5.0 4.1 ATI MW-4 01/16/96 5.43 17.21 -11.78 ND<50 -- ND<0.50 ND<0.50 ND<0.5o ND<1.0 ND<5.0 - - ATI MW-4 04/12/96 5.43 15.11 -9.68 ND<50 --- ND<0.5 ND MWA 07/12196 5.43 15.42 499 ND<50 --- --- ND<0.5 ND<7 ND<7 ND<7 ND<10 - 2.2 SPL 09-Sep-96 PAGE 2