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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. Bah PINP TOC DTW SPH OWEORO 8 T E X MrBE TBA DIPE ETBE TAME Ethanol 1,2-0CA EDB O.O. Cammenls I (ft-MSL) (feet) (feet) (ft-MSL) (PgIL) (P9/L) (Pg/L) (091L) (PgIL) (Pg/L) (PgIL) (Pg1L) (P9IL) (P9/L) W91L) (Pg/L) (P9/L) VW-8 03/16/00 - 35.24 0.00 06126100 37.80 0.00 09/28100 - 42.03 0.00 - - - - - - - - - - - - - - - 12/19/02 41 .57 0.00 - 290 46 1 .4 12 3.1 <1 .0 <10 <1 .0 41 .0 <1,0 - - - - - 03/06/03 P 39.27 0.00 - 930 150 J 1 .6 68 1 .4 1 .0(2) <20 <2.5 <2.5 <2.5 <500 6.0 X2.5 1 .20 - 06/11/03 P 38.17 0.00 - 530 81 1 .91 23 1 .3 <2.5[2] <100 <5.0 <5.0 <5.0 <500 - - 2.97 - 0924/03 P 42.21 0.00 - 11900 140 <5.0 200 270 <5.0[2] <200 <10 <10 <10 <11000 - - - - 12/10/03 P 41 .60 0.00 - 81 1 . 1 <0.50 <0.50 <0.50 4.9[2] <20 <1 .0 <1 .0 <1 .0 4100 1 .9 - - - - 03/08/04 P 39.36 0.00 - 1 ,500 120 <2.5 64 <2.5 <2.5[2] 4100 <5.0 <5.0 <5.0 <500 <2.5 - 1 .06 - 06/24/04 NP 44.11 0.00 - 130 2.6 <2.5 <2.5 <2.5 28[2] <100 <2.5 <2.5 <2.5 <500 300 2.17 WATER 0920/04 P 48.40 0.00 - 51 ,000J 2,400 110 340 200 <50rA 42,000 <100 <100 4100 <10,000 <50 - 0.40 - 12/21/04 P 44.90 0.00 - 154000 112001 64 440 450 <5.0[2] <200 <10 <10 <to <1 ,000 50 - 0.50 WATER 03127/05 P 41 .65 0.00 - 41100 1 ,200 120 320 250 <25[2] <11000 <50 <50 <50 <51000 <25 - 1 .00 - 06119/05 P 42.03 0.00 - 101000J 710J 11100 710J 11700 <12M <500 412 <12 <12 <21500 <12 - 0.80 - 09/11/05 P 46.60 0.00 - 7,200J 181 <12 32 80 <12[2] <500 <12 <12 <12 <2,500 <12 - 0.90 - 12/11/05 P 43.43 0.00 - 2,700 550 58 220 170 <5.0[2) <200 <5.0 45.0 <5.0 <7 ,000 <5.0 - 0.40 - 03/19/06 P 40.12 0.00 - 2,900 J 530 J 46 J 320 J 320 J <5.0 MUJ <200 UJ <5.0 UJ <5.0 UJ <5.0 UJ <31000 UJ 7A J - 0.50 - 06/13/06 P 39.89 0.00 - 2,200 460 42 240 180 0.74 <20 <0.50 <0.50 <0.50 <300 <0.50 - 0.90 - 09/12J06 P 16.19 45.31 0.00 -29.12 4,600 390 38 430 370 <10 <400 <10 <10 <10 <81000 470 - 0.30 - 12/14106 P 42.68 0.00 -26A0 11600 88 5A 110 as 42.5 4100 Q.5 42.5 42.5 41,500 7A W 01I VW-9 03/06/03 _ _ _ _ _ _ _ _ _ _ _ _ 12/10/03 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ DRY 03108/04 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ DRY 0623104 NP _ _ _ _ _ _ _ _ _ _ DRY 0920104 - - _ _ _ _ _ _ _ _ _ DRY 1220104 _ _ _ _ _ _ _ _ _ _ _ DRY 03/28/05 _ _ _ - _ _ _ _ DRY Ik 06/19/05 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ DRY 09/11/05 - - - - - - - - - - - - - - - - - - DRY 12111/05 - - - - - - - - - - - - - - - - - - DRY 03/19/06 _ _ _ _ _ _ _ _ _ _ _ _ _ _ DRY 06/14106 1 09/12106 - 15.53 - - - - - - - - - - - - - - - - - DRY 12114106 DRY VW-10 12119/02 - - 41 .59 0.00 - 14,000 2,800 890 890 3,600 <10.012] <100 <10 <10 <10 - - - - - 03106103 P 39.13 0.00 - 20,000 21600 260 1 ,300 4,900 450[2] <21000 <50 <50 <50 <10,000 <50 <50 2.30 - 06/11/03 P 38.66 0.00 - 14,000 11600 39 1 ,100 3,300 <25rA <17000 <50 <50 <50 <5,000 - - 3.92 - 09/24/03 P 42.70 0.00 - 22800 180 7.4 270 480 <5.0[2) <200 <10 <10 <10 <1 ,000 - - - - 12/10103 P 41 .61 0,00 - 20,000 3,200J 720J 2,100J 6,800J <5.0[2] <200 <10 <10 <10 <13000 97 - - 03108/04 P 39.19 0.00 1,500 110 42.5 62 42.5 42.5[2] 4100 45.0 4.5.0 450 4500 42.5 2.76 02130 406 Tables 1-2xls Page 20 of 24 SECOR