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TABLE 2 Historical Groundwater Monitoring & Analytical Data ARCO Service Station No, 2130 7906 N. EL Dorado Street, Stockton, CA Well No. Dah WNP TOC DTW SPH OWE ORO B T E X MTBE TBA DIPE ETBE TAME Ethanol 1,2-DCA EDB D.O. Comments (1t-MSL) (feet) (feet) (R-MSL) (P91L) WNL) (PNL) (Poly lP9/L) (P911.) (P911.) (P911.) (PNy W91L) (P911.) WNLI IP91L) VW-6 09/11/05 _ - _ - _ _ _ _ _ _ _ _ _ _ _ _ _ DRY 12/11/05 - - - - - - - - - - - - - - - - - DRY 03/19106 - - - - - - - - - - - - - - - - - DRY 06/14/06 - 09/12/O6 - 17.04 - - - - - - - - - - - - - - - - - DRY 12/14106 m m DRY VW-7 0520197 - 45.05 0.00 - 56 0.60 <0.50 <0.50 0.80 4.0 - - - - - - - - - 09/01/98 - 41 .63 0.00 - - - - - - - - - - - - - - - - 12/02/98 38.95 0.00 - - - - - - - - - - - - - - - - 03131/99 38.86 0.00 - - - - - - - - - - - - - - - - 06/04/99 36.63 0.00 - - - - - - - - - - - - - - - - 09/02199 41 .22 0.00 - - - - - - - - - - - - - - - - 11129/99 _ _ - - _ _ _ _ _ _ _ - - _ _ _ INA 03/16100 _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ INA I 06126100 36.82 0.00 0928100 41 .13 0.00 - - - - - - - - - - - - - - - - 12/19/02 41 .69 0.00 - 160 <0.50 <0.50 1 .3 <0.50 11.0[2] 77 <0.50 <0.60 <0.50 - - - - - 03/06/03 P 39.41 0.00 - 440 0.59 <5.0 <5.0 <5.0 11 [2] 83 <5.0 <5.0 <5.0 <100 320 <5.0 1 .10 - 06/11/03 P 39.00 0.00 - <50 <0.50 <0.50 <0.50 <0.50 0.54[2] <20 <1 .0 <1 .0 <1.0 <100 - - 4.12 - 0924/03 P 42.99 0.00 - <50 <0.50 <0.50 <0.50 <0.50 <0.50[2] <20 <1 .0 <1 .0 <1.0 <100 - - - 12/10/03 P 41 .73 0.00 - 210 3.0 <2.5 25 4.8 9.1 [2] <100 <5.0 <5.0 <5.0 <500 160 - - - 03108/04 P 39.45 0.00 - 59 <2.5 <2.5 <2.5 <2.5 6.3[2] <1W <5.0 <5.0 <5.0 <500 64 - 1 .55 - 06/24/04 P 44.39 0.00 - <50 <0.50 <0.50 <0.50 <0.50 1.1 [2] <20 <0.50 <0.50 <0.50 <100 16 - 3.06 WATER 09/20/04 P 48.56 0.00 - <50 <0.50 <0.50 <0.50 <0.50 1.2[2] <20 <1 .0 <1 .0 <1.0 <100 20 - - 1220/04 P 45.48 0.00 - 300 J <0.50 <0.50 <0.50 <0.50 13x2] 100 <1 .0 <1 .0 <1.0 <100 210 J - 1 .87 - 03128105 P 42.48 0.00 - 280 <5.0 <5.0 <5.0 <5.0 9.5[2) <200 <10 <10 <10 <1 ,000 280 - 1 .40 0620M P 42.85 0.00 - 1001 <0.50 <0.50 <0.50 <0.50 3.0 [2]J 25 <0.50 <0.50 <0.50 <100 72 - 1 .20 WATER - 08/12/05 P 47.38 0.00 - <50 <0.50 <0.50 <0.50 <0.50 0.93[2] <20 <0.50 <0.50 <0.50 <100 15 - 1 .80 WATER 12/11/05 P 44.02 0.00 - 290 <0.50 <0.50 <0.50 0.61 8.8 [2]J 130 <0.50 <0.50 2.3 <100 210 - 0.97 - 0320/06 P 40.85 0.00 - 430 J <0.50 UJ <0.50 UJ <0.50 W <0.50 UJ 7.5 [2]J 140 J <0.50 UJ <0.50 UJ <0.50 UJ <300 UJ 240 J - 1 .00 - 06/13/06 P 40.54 0.00 - 99 <0.50 <0.50 <0,50 <0.50 2.3 <20 <0.50 <0.50 <0.50 <300 62 - 2.90 - 09/12/06 P 16.76 46.10 0.00 -29.34 <50 <0.50 <0.50 <0.50 <0.50 1.2 <20 <0.50 <0.50 <0.50 <300 18 - 1 .20 - 12/14106 P 43A5 0.00 -26.69 340 <0.50 <0.50 0.50 40,50 7.0 170 <0.50 40.50 <0.50 <300 40,50 m 0.73 VW-8 0520/97 - 44.81 0.00 - 25,000 480 290 260 3,900 <120' - - - - - - - - - 09/01198 - 40.23 0.00 - - - - - - - - - - - - - - - - 12/02/98 - 38.69 0.00 - - - - - - - - - - - - - - - - 03131199 37.50 0.00 - - - - - - - - - - - - - - - - 06/04/99 - 36.56 0,00 - - - - - - - - - - - - - - - - 09/02/99 - 40,99 0.00 - - - - - - - - - - - - - - - - 1129/99 39.14 0.00 02130 4006 Tables 1-2AIs Page 19 of 24 SECOR