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TABLE 3 Historical Groundwater Monitoring &Analytical Data Stockton Charter Way Commingled Plume 440, 441, and 508 West Charter Way and 1444 South Lincoln Street, Stockton, CA Depth Measured Calc. TOC Motor 1,2- to SPH GW GRO DRO B T E X MTBE TBA DIPE ETBE TAME Ethanol McOH EDB D.O. Well No. Date Notes Elevation Water Thickness Elev. (pg/L) (pg/L) Oil (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (Ng/L) (Ng/L) (pg/L) DCA (pg/L) (mg/L) Comments feet IL (feet) (feet) (feet) (feet) (N9/L) (pg/L) SMW-14 08/21/97 9.53 24.20 0.00 -14.67 150 8.5 <0.5 <0.5 0.83 11/18/97 25.31 0.00 -15.78 200 15 0.90 <0.5 2.4 02/09/98 22.65 0.00 -13.12 66 4.4 0.50 <0.5 0.98 05/21/98 18.80 0.00 -9.27 <50 <0.5 <0.5 <0.5 <0.5 08/11/98 19.10 0.00 -9.57 100 7.5 <0.5 <0.5 1.2 11/09/98 20.14 0.00 -10.61 150 9.1 <0.50 <0.50 1.3 02/17/99 19.74 0.00 -10.21 <50.0 <0.500 <0.500 <0.500 <0.500 05/25/99 18.56 0.00 -9.03 <50 <0.50 <0.50 <0.50 <0.50 08/18/99 19.89 0.00 -10.36 <50.0 1.1 <0.500 0.76 3.0 11/05/99 19.36 0.00 -9.83 280 31 43 12 49 02/22/00 19.69 0.00 -10.16 140 4.9 9.2 3.9 21 05/16/00 18.20 0.00 -8.67 <50.0 2.4 <0.500 <0.500 <0.500 <2.00 <100 <2.00 <2.00 <2.00 <2.00 <2.00 08/30/00 19.40 0.00 -9.87 <50.0 54 <0.500 <0.500 <0.500 <0.500 <2.00 <100 <2.00 <2.00 <2.00 <2.00 <2.00 11/21/00 20.54 0.00 -11.01 <50.0 84 <0.500 <0.500 <0.500 <0.500 <2.00 <100 <2.0 <2.0 <2.0 <2.0 <2.0 02/15/01 20.48 0.00 -10.95 <50.0 <50.0 <0.500 <0.500 <0.500 <0.500 <2.00 <200 <2.00 <2.00 <2.00 <2.00 <2.00 05/17/01 20.48 0.00 -10.95 <50 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 08/16/01 21.43 0.00 -11.90 <50 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <2.0 <2.0 <2.0 <2.0 <2.0 12/06/01 22.15 0.00 -12.62 <50 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <2.0 <2.0 <2.0 <2.0 <2.0 02/14/02 8.61 20.76 0.00 -12.15 <50 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <2.0 <2.0 <2.0 <2.0 <2.0 05/31/02 20.75 0.00 -12.14 <50 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <2.0 <2.0 <2.0 <2.0 <2.0 08/23/02 22.09 0.00 -13.48 <50 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <2.0 <2.0 <2.0 <2.0 <2.0 09/27/02 22.47 0.00 -13.86 - - - - - - - - - - - - - 11/13/02 22.92 0.00 -14.31 <50 84 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <2.0 <2.0 <2.0 <2.0 <2.0 1.1 02/11/03 21.72 0.00 -13.11 <50 74 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <2.0 <2.0 <2.0 <2.0 <2.0 0.7 05/29/03 21.43 0.00 -12.82 <50 78 <0.50 <0.50 <0.50 <0.50 0.92 <50 <2.0 <2.0 <2.0 <2.0 <2.0 - 08/14/03 22.18 0.00 -13.57 98 <50 <0.50 <0.50 <0.50 <1.0 3.5 5.5 <2.0 <2.0 <2.0 3.5 <0.50 11/03/03 22.98 0.00 -14.37 <50 75 <0.50 <0.50 <0.50 <1.0 20 11 <2.0 <2.0 <2.0 8.7 <0.50 02/09/04 22.45 0.00 -13.84 <100 90 <1.0 <1.0 <1.0 <2.0 86 15 - - - 13 <1.0 05/10/04 21.90 0.00 -13.29 <250 <50 <2.5 <2.5 <2.5 <5.0 230 31 17 <2.5 08/09/04 23.22 0.00 -14.61 <250 62 <2.5 <2.5 <2.5 <5.0 470 <25 12 <2.5 11/15/04 23.74 0.00 -15.13 <500 <50 <5.0 <5.0 <5.0 <10 1,700 78 24 <5.0 02/08/05 22.31 0.00 -13.70 <1,300 <50 <13 <13 <13 <25 2,200 <130 23 <13 05/09/05 20.23 0.00 -11.62 <1,300 <50 <13 <13 <13 <25 1,100 <130 <13 <13 08/08/05 29.80 0.00 -21.19 <1,300 56 <13 <13 <13 <25 2,400 470 13 <13 11/07/05 22.27 0.00 -13.66 <500 <50 <5.0 <5.0 <5.0 <10 1,500 390 9.0 <5.0 02/06/06 20.14 0.00 -11.53 2,400 64 <13 <13 <13 <25 1,600 <130 <13 <13 05/08/06 19.40 0.00 -10.79 690 N 140 <0.50 <1.0 <1.0 <1.0 810 700 4.4 <1.0 08/07/06 18.80 0.00 -10.19 1,000 59 <0.50 <0.50 <0.50 <1.0 990 460 5.2 <0.50 10/30/06 19.62 0.00 -11.01 <1,200 59 <12 <12 <12 <25 460 620 <12 <12 01/29/07 19.81 0.00 -11.20 440 110 <2.5 <2.5 <2.5 <5.0 310 1,000 3.6 <2.5 05/07/07 19.30 0.00 -10.69 140 N 250 0.59 <1.0 <1.0 <1.0 200 990 3.5 <1.0 08/06/07 19.19 0.00 -10.58 64 N 69 N <0.50 <1.0 <1.0 <1.0 52 340 2.3 <1.0 11/05/07 20.44 0.00 -11.83 <50 50 N <0.50 <1.0 <1.0 <1.0 100 270 2.1 <1.0 Stockton Charter Way Commingled Plume 4Q10 Tables.xlsm Page 61 of 72 Stantec