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TABLE 2 Historical Groundwater Monitoring & Analytical Data ARCO Service Station No. 2130 7906 N. EL Dorado Street, Stockton, CA We9 No. pale pINP TOC DTW SPH GWE ORO B T E X MTBE TBA DIPE ETBE TAME Ethanol 1 ,2-DCA EDB D.O. Comments (it-MSL) (het] (feet) [f[-M8L1 Ip9IL) IP91L) (p91L) fI191L) V191L) 14911.) (P9/L) Ip9/L) (P9/1.1 IP9/L) (P9/L) (P91L) lP9/Ll MW-8 05119/95 - 14. 16 51 .66 0,00 -37.50 55•0' <0.50 <0.50 <0.50 <0.50 - - - - - - - - - - 0828195 - 53.34 0.00 39.18 <50 <0.50 <0.50 <0.50 <0.50 - - - - - - - - - - 12/07/95 - 52.02 0.00 37.86 <50 <0.50 <0.50 <0.50 <0.50 - - - - - - - - - - 02105/96 _ - - - _ _ _ _ _ _ _ _ - _ _ _ _ NS [11 05/30/96 _ _ - - - _ _ _ _ _ - _ - - NS [11 07/28f96 - - - - - - - - - - - - - - - - DEST f4W-iG 11/29/93 - 14.38 59.30 0.00 44.92 1 ,000 <11 " <3.0^ <1 .0• 1.0 - - - - - - - - - - 03123194 54.36 0.00 39.98 11300 6.6 6.1 1 .6 3.6 - - - - - - - - - - 06122/94 54.35 0.00 39.97 1 ,600 5.0 15 3.3 5.5 - - - - - - - - - - 09/28/94 58.11 0.00 43.73 - - - - - - - - - - - - - - - 09/29/94 - - - - 13100 <0.50 <0.50 3.6 4.0 - - - - - - - - - - 12/01/94 14.38 57.15 0.00 42.77 800 <0.50 2.3 0.80 1 .3 - - - - - - - - - - 02/28/95 - 54.24 0.00 39.86 300 0.90 <0.50 <0.50 <0.50 - - - - - - - - - 05/19/95 52.32 0.00 37.94 370 0.90 <0.50 <0.50 <0,50 - - - - - - - - - - 08/28I95 53.70 0.00 -39.32 420 1.2 <0.50 <0.50 <0.50 - - - - - - - - - - 12107/95 52.61 0.00 38.23 490 0.70 <0.50 <0.50 <0.50 - - - - - - - - - - 02105196 50.13 0.00 35.75 350 0.70 <0.50 <0.50 <0,50 - - - - - - - - - - 05130196 47.09 0.00 -32.71 350••• <6.0•• <0.50 <0.50 <0.50 <6.0•• - - - - - - - - 09/18/96 50.84 0.00 36.46 510 <15" 1 .0 <0.50 <0.50 <9.0•• - - - - - - - - - 1126196 48.72 0.00 -34.34 <600••• <0.50 <0.50 <0.50 <0.50 <10•• 0324/97 43.77 0.00 -29.39 <5D0••• <5.0•• <0.80•• <0.50 <0.50 47.0•• - - - - - - - - - 0520/97 44.20 0.00 -29.82 460 <5•• <0.50 <0.50 <0.50 <7.0•• - - - - - - - - - 08/19/97 47.66 0.00 33.28 440 <0.50 <0.50 <0.50 <0.50 <5.0 - - - - - - - - - 11/19/97 45.95 0.00 31 .57 510 2.2 2.2 0.93 3.1 <5.0 - - - - - - - - - 03/04/98 - 41 .43 0.00 -27.05 110 0.66 <0.50 <0.50 <0.50 <5.0 - - - - - - - - - 0626/98 - 39.11 0.00 -24.73 330 4.8 <0.50 <0.50 <0.50 <5.0 4700 <2.0 <2.0 <2.0 - - - - - 09/01/98 40.78 0.00 -26.40 300 <0.50 <0.50 <0.50 <0.50 <5.0 <100 <2.0 <2.0 <2.0 - - - - - 12/02/98 - 38.23 0.00 -23.85 410 6.9 <0.50 <0.50 0.87 20 <200 <2.0 <2.0 <2.0 - - - - - 03/31/99 - 34.71 0.00 -20.33 220 6.4 0.95 0.76 2.7 7.5 <200 <2.0 <2.0 <2.0 - - - - - 06104/99 35.86 0.00 -21 .48 290 <0.50 <0.50 <0.50 <0.50 6.5 <200 <2.0 <2.0 <20 - - - - - 09/02199 - 40.26 0.00 -25.88 150 40.50 <0.50 <0.50 40.50 <5.0 <200 <2.0 <2.0 <2.0 - - - - - 11/29/99 - 38.58 0.00 -24.20 200 3.6 <0.50 40.50 0.61 9.1 200 <2.0 2.0 <2.0 - - - - 03/16/00 - 34.69 0.00 -20.31 270 0.74 <0.50 <0.50 <0.50 6.0 <200 <2.0 <2.0 <2.0 - - - - - 0626/00 37.05 0.00 -22.67 390 <0.50 <0.50 <0.50 <0.50 <2.0 (2] <100 <2.0 <2.0 <2.0 - - - - - 0928100 41 .28 0.00 -26.90 <50 0.87 <0.50 <0.50 <0.50 <2.0 (2] <200 <2.0 <2.0 <2.0 - - - - - 12l19/00 - 37.20 0.00 -22.62 <50 <0.50 <0.50 <0.50 40.50 <2.5 <200 <2.0 <2.0 42.0 - - - - - 03/15/01 _ - - - - _ - - - - - _ _ - - - - _ INA 06/20/01 36.98 0.00 - 11,000[5) <2.014] <2.014] <2.0 (4] 42.0 [4) <2.0 f4 <100 <2.0 <2.0 <2.0 - - - - - 09/12/01 - - _ _ - - - - _ _ - - - - _ _ _ INA 12/12!01 INA 02130 4Q06 Tables 1-2.xls Page 15 of 24 SECOR