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TABLE 2 Historical Groundwater Monitoring & Analytical Data ARCO Service Station No. 2130 7906 N. EL Dorado Street, Stockton, CA TOC DTW SPH OWE 6R0 8 T E X MTBE TBA DIPE ETRE TARE Ethanol 1,2-DCA EDB F12/19102 (&�) (�O (F O (R-MSL) WWLj WWLI (P91L1 (P91L) (P91L) (P91L) (P91LI (P9/L) IP91L) (P9IL) (P9IL) (49IL) WIL) DO. Comments - 42.39 0.00 - - - - - - - - - - - - - - -36.86 0.00 - 240 22 6.6 1 .7 12 <0.50[2] <20 <O.50 <0.50 <0.50 <100 1 .7 <050 1 .90 38.12 0.00 - 110 16 6.4 1 .6 10 0.55[2] <20 <1 .0 <1 .0 41 .0 <100 - - 6.86 42.15 0.00 - <50 <0.50 <0.50 <0.50 <0.50 0.51 (2] <20 <to 41 .0 41 .0 <100 - - - - 12/10/03 P 42.43 0.00 - 120 16 18 3.7 24 0.58[2] <20 <1 .0 <1 .0 <1 .0 <100 0.97 - - - 03/09/04 P 38.94 0.00 - 170 2.2 <0.50 <0.50 <0.50 7.7[2] <20 <1 .0 <1 .0 <1 .0 <100 0.87 - 2.11 - 0624/04 P 43.45 0.00 - <50 2.8 2.2 <0.50 20 <0.50[2] <20 <0.50 <0.50 <0.50 <100 <0.50 - 1 .01 WATERv 09/20/04 P 47.58 0.00 - <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] <20 <1 .0 <1 .0 0.0 <100 1 .1 - 0.80 - 12/20/04 _ _ _ _ _ _ _ _ _ - - - - _ _ _ _ NS 03/29/05 P 42.25 0.00 - 65 <0.50 <0.50 <0.50 <0.50 <0.50[2] <20 <1 .0 <1 .0 41 .0 <100 0.79 - 1 .80 WATER 06120/05 P 41 .58 0.00 - 200 J 1 .5 J 1 .2 <0.50 1 .9 <0.50[2] <20 <0.50 <0.50 <0.50 <100 <0.50 - 1 .40 WATER 09/12105 P 45.99 0.00 - 200 2.2 0.89 0.63 27 <0.50[2] <20 <050 <0.50 <0.50 <100 <0.50 - 1 .80 WATER 12/11/05 P 42.95 0.00 - 130 0.86 1 .4 <0.50 2.1 <0.50[2] <20 <0.50 <0.50 <0.50 <100 <0.50 - 2.00 - 03120/06 P 39.44 0.00 - 290 J 2.1 J 2.8 J 0.84 J 4.3 J <0.50 [2]UJ <20 UJ <0.50 UJ <0.50 UJ <0.50 W <300 UJ <0.50 UJ - 0.90 - 06/13106 P 39.22 0.00 - 150 2.8 0.66 <0.50 1.0 <0.50 <20 <0.50 <0.50 <0.50 <300 <0.50 - 0.40 - 09/12/06 P 44.55 0.00 - 190 0.98 <0.50 <0.50 0.64 <0.50 QO <0.50 <0.50 <0.50 <300 <0.50 - 0.90 - 12JUM6 P 42.20 0.00 62 0.65 0.91 <0.50 1.1 40,50 <20 40.50 <0.50 49.50 400 40.50 1.26 MS-1B 12119/02 - - 41 .96 0.00 - 82 10 <0.50 1 .8 <0.50 <0.5012] <200 <0.50 <0.50 <0,50 - - - - - 03106/03 P 39.00 0.00 - 510 9.3 10 4.6 21 <0.5012] <20 <0.50 <0.50 <0.50 4100 1 .8 <0.50 1 .30 - 06/11/03 P 38.33 0.00 - 130 2.7 1.6 J <0.50 0.69 J <0.50[2] <20 <to <1 .0 41.0 <100 - - 3.15 - 09/24103 P 42.30 0.00 - <50 <0.50 <0.50 <0.50 <0.50 0.62[2] <20 <1 .0 <1 .0 41.0 <100 - - - - 12/10103 P 41 .99 0.00 - 120 14 15 3.1 20 0.57[2] <20 <1 .0 <1 .0 <1 .0 <100 0.96 - - - 03/09/04 P 39.07 0.00 - 430 2.5 <0.50 <0.50 <0.50 8.9121 <20 <1 .0 <1 .0 <1.0 <100 1 .0 - 2.96 - 0624/04 P 43.38 0.00 - <50 UJ 2.6 2.2 <0.50 1 .9 <0.50[2] <20 <0.50 <0.50 <040 <100 <0.50 - 0.96 WATER T, 09/20/04 P 47.59 0.00 - <50 3.8 J 0.56 J <0.50 <0.50 <0.50[21 <20 <1 .0 41 .0 <1.0 <100 <0.50 - 3.40 - 12/20/04 _ _ _ _ _ _ _ _ - - - _ _ _ NS 0329/05 P 41 .25 0.00 - <50 0.63 J <0.50 UJ <0.50 W <0.50 UJ <0.50[21 420 <1 .0 41 .0 <1.0 <100 <0.50 - 3.40 WATER > 06/20105 P 41 .68 0.00 - 160 J 3.5 J 4.1 1 .0 J 5.5 <0.50[2] <20 <0.50 <0.50 <0.50 <100 <0.50 - 1 .50 WATER SII 09/12105 P 46.04 0.00 - 290 3.1 3.0 0.76 3.7 40.50121 <20 <0.50 <0.50 <0.50 <100 <0.50 - 1 .60 WATER 12/11/05 P 42.95 0.00 - 270 2.2 3.1 0.94 4.6 <0.50[2] <20 <0.50 40.50 <0.50 <100 40.50 - 1.30 - 03120/06 P 39.71 0.00 - 200 2.4 2.5 0.77 3.3 <0.50121 <20 <0.50 <0.50 <0.50 <300 <0.50 - 1 .00 - 06/13106 P 39.27 0.00 - 190 3.0 1 .5 0.82 4.6 <0.50 <20 <0.50 <0.50 <0.50 <300 <0.50 - 1 .40 - 09/12/06 P 44.60 O.OD - 220 1 .4 1 .5 <0.50 2.0 <0.50 <20 <0.50 <0.50 <0.50 <300 <0.50 - 0.90 - 12/14106 P 1 42.26 0.00 <50 14 0.75 40.50 0171 40.50 <20 <0.50 40.50 <0.50 <300 4050 1106 MS-2A 12/19/02 - 41 .38 0.00 - <50 <0.50 <0.50 <0.50 <0.50 0.79[2] <200 <0.50 <0.50 <0.50 - - - - - 03106/03 P 39.20 0.00 - 62 1 .4 0.59 1 .2 5.5 0.61 [2] <20 <0.50 <0.50 <0.50 GIGO 0.53 <0.50 4.00 06111103 P 38.80 0.00 - <50 <0.50 <0.50 <0.50 <0.50 <0.50 (2jUJ <20 <1 .0 41 .0 <1 .0 <100 - - 3.12 - 09/24/03 P 42.81 0.00 - <50 <0.50 <0.50 <0.50 <0.50 0.62[2] <20 <1 .0 <1 .0 41 .0 <100 - - - - 12/10103 P 41 .41 0.00 - 150 18 20 3.7 25 0.60121 <20 <1 .0 <1 .0 <1 .0 <100 1 .1 - - - 03/09/04 P 39.26 0.00 11000 33 40.50 7.1 <0.50 3.8(2 <20 <1 .0 <1 .0 <1 .0 <100 2.2 1 .07 02130 4006 Tables 1-2xls Page 1 of 24 SECOR