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TABLE 2 Historical Groundwater Monitoring &Analytical Data ARCO Service Station No. 2186 3212 North California Street, Stockton, CA Depth Measured Catc. TOC to SPH GW GRO B T E X MTBE TBA RIPE ETBE TAME Ethanol 1'2 EDB D.O. Well No. bate Notes Elevation DCA Comments (ft-MSL) Water Thickness Elev. (pglL) (pg1L) (pg1L) {p91L) Ipg1L) Ip91L) (pglL) (pg1L) fmg/L) f€aet) (feet) (ft-MSL) Ip91L1 VW-313 05/23/96 15.01 45.76 0.00 -30.75 290 <0.50 <0.50 <0.50 <0.50 <3.0 09/19/96 54.02 0.00 -39.01 310 <0.50 <0.50 <0.50 <0.50 <3.0 11/27196 51.15 0.00 -36.14 280 <0.50 <0.50 <0,50 <0.50 <3.0 03/21/97 42.49 0.00 -27.46 180 <0.50 <0.50 <0.50 <0.50 <3.0 05/22197 44.28 0.00 -29.27 240 <0.50 <0.50 <0.50 <0.50 <3.0 08/20197 50.21 0.00 -35.20 200 <0.50 <0.50 <0.50 <0.50 <5.0 11/20197 49.46 0.00 -34,45 160 4.6 4.4 2.6 6.7 <5.0 <100 <2.0 <2.0 <2.0 02/17198 44.72 0.00 -29.71 93 <0.50 <0.50 <0.50 <0.50 <5.0 - - - - 06/24198 36.28 0.00 -21.27 <50 <0.50 <0.50 <0.50 <0.50 <5.0 <200 <2.0 <2.0 <2.0 09/21198 39.69 0.00 -24.68 230 4.6 <0.50 2.2 3.2 16 310 <2.0 <2.0 <2.0 12/14198 37.90 0.00 -22.89 57 <0.50 <0.50 <0.50 1.1 <5.0 <200 <2.0 <2.0 5.1 03/31199 35.81 0.00 -20.80 <50 <0.50 <0.50 <0.50 <MU <5.0 <200 <2.0 <2.0 <2.0 06/11199 34.60 0.00 -19.59 150 1.9 <0.50 7.0 16 19 <200 <2.0 <2.0 <2.0 09/10199 38.77 0.00 -23.76 1,200 55 <0.50 55 1.4 1,600 <1,000 <10 <10 12 12103M 38.76 0.00 -23.75 80 <0.50 <0.50 <0,50 <0.50 150 <200 <2.0 <2.0 2.1 04/03100 35.45 0.00 -20.44 <50 3.4 <0.50 1.9 5.6 30 <200 <2.0 <2.0 <2.0 06122/00 35.51 0.00 -20.50 1,700 85 3.8 230 430 3,200 <200 <2.0 <2,0 23 09/27100 40.81 0.00 -25.80 - - - - - - - - - 10/19100 40.64 0.00 -25.63 - - - - - - - - 12/20100 38.71 0.00 -23.70 <50 <0.50 <0.50 <0,50 <0.50 27 <200 <2.0 <2.0 <2.0 i 03116/01 37.60 0.00 -22.59 <50 <0.50 <0.50 <0.50 <0.50 9.1 <200 <2.0 <2,0 <2.0 0812101 40.43 0.00 -25.42 <1,000 97 53 290 750 5,000 <3,800 <77 <77 <77 09/13101 46.19 0.00 -31.18 <50 <0.50 <0.50 <0.50 <0.50 90 - - - - 12/11/01 43.41 0.00 -28.40 <50 <0.50 <0.50 <0.50 <0.50 200 <20 <2.0 <2.0 <2.0 03/14/02 40.37 0.00 -25.36 <50 <0.50 <050 <0.50 <0.50 26 <5.0 <0.50 <0.50 <0.50 06119!02 42.71 0.00 -27.70 460 N <0.50 <0.50 <0.50 <0.50 1,500 21 <0.50 0.63 7.0 - 28 - 09/12102 49.50 0.00 -34.59 320 <2.5 <2.5 <2.5 <2.5 140 <25 <25 <2.5 <2.5 <200 29 <2.5 12/03/02 46.60 0.00 -31.59 <500 <5.0 <5.0 <5.0 <5.0 69 <200 <5.0 <5.0 <5.0 - 6.1 - 03/11/03 46.51 0.00 -31.50 380 J <2.5 <2.5 <25 <2.5 370 <100 <2.5 <2.5 <2.5 <500 3.9 1.0 06/09/03 42.39 0.00 -27.38 2,600 <10 <10 <10 <10 6,900 <4,000 <200 e200 <200 <20.000 <100 2.9 09!17!03 51.62 0.00 -36,61 110 R <5.0 <5.0 <5.0 <5.0 210 <200 <10 <10 <10 0,000 23 1.9 12111!03 46.38 0.00 -31.37 16,000 1,100 930 1,100 4,300 3,500 <2,000 <100 <100 <100 <10.000 <50 - 03/10/04 46.67 0.00 -31.66 76 <10 <10 <10 <10 240 J <400 <20 <20 <20 <2,000 <10 1.9 06/17/04 13.98 48.43 0.00 -34,45 <50 <2.5 <2.5 <2.5 <2.5 180 <100 <5.0 <5.0 <5.0 <500 1$ 0.9 09123!04 54.55 0.00 -40.57 94 1.8 1.9 0.61 12 45 23 <1.0 <1.0 <1.0 <100 8.5 <0.50 1.2 12/21/04 49.06 0.00 -35.08 320 <12 <12 <12 66 250 <500 <25 <25 <25 <2,500 <12 <12 1.3 03/30/05 44.99 0.00 -31.01 <50 <0.50 <0.50 <0.50 <0.50 3.2 <20 <1.0 <1.0 <1.0 <100 0.77 <0.50 1.3 06/13/05 43.03 0.00 -29.05 <50 <0.50 <0.50 <0.50 <0.50 6.2 <20 <0.50 <0,50 <0.50 <100 1.4 <0.50 0.7 09/08/05 47.97 0.00 -33.99 51 <0.50 2.4 <0,50 3.9 33 <20 <0.50 <0.50 <0.50 <100 3.0 <0.50 5.2 MUM 45.04 0.00 -31.06 <50 <0.50 <0.50 <0.50 <0.50 5.1 <20 <0.50 <0,50 <0.50 <100 1.2 <0.50 2186 2411 Tabfes.xlsm Page 16 of 19 Stanfec