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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)) (feet) (feet) (feet) (Ng/L) (pgIL) SMW-18-80 02/04/08 9.41 20.10 0.00 -10.69 590 100 N 270 18 19 11 <5.0 <50 - - - - <2.5 <5.0 05/05/08 19.65 0.00 -10.24 3,100 750 N 320 9.5 12 18 <5.0 <50 <10 <10 <10 <500 <2.5 <5.0 08/04/08 20.65 0.00 -11.24 - - - - - - - - - - - - - - 08/05/08 - - - 3,900 530 N 350 9.8 10 15 <2.0 <20 <4.0 <4.0 <4.0 <200 <1.0 <2.0 10/28/08 21.65 0.00 -12.24 - - - - - - - - - - - - - - 10/29/08 - - - 3,100 800 N 190 6.6 6.5 10 <2.0 <20 <4.0 <4.0 <4.0 <200 <1.0 <2.0 01/27/09 22.10 0.00 -12.69 - - - - - - - - - - - - - - 01/28/09 - - - 3,800 940 N 250 6.8 9.5 14 <2.0 <20 <4.0 <4.0 <4.0 <200 <1.0 <2.0 04/27/09 20.45 0.00 -11.04 - - - - - - - - - - - - - - 04/28/09 - - - 3,200 830 N 220 6.6 9.6 13 <2.0 <20 <4.0 <4.0 <4.0 <200 <1.0 <2.0 10/14/09 21.40 0.00 -11.99 3,300 400 N 2,000 42 46 21 <2.0 44 <4.0 <4.0 <4.0 <200 <1.0 <2.0 05/24/10 18.82 0.00 -9.41 3,000 440 N 1,700 36 24 <20 <20 <200 <40 <40 <40 <2,000 <10 <20 10/04/10 12.09 20.30 0.00 -8.21 - - - - - - - 10/13/10 - 2,700 <1,000 140 6.2 10 12 <0.50 11 <0.50 <0.50 <0.50 <20 <0.50 SMW-18-120 09/24/02 9.41 23.71 0.00 -14.30 - - - - - - - - - - - - - - 09/27/02 24.39 0.00 -14.98 430 - 49 9.1 3.0 9.0 <0.50 <50 <2.0 <2.0 <2.0 <500 <2.0 <2.0 11/13/02 24.82 0.00 -15.41 620 <50 56 11 3.5 7.1 <0.50 <50 <2.0 <2.0 <2.0 - <2.0 <2.0 3.8 02/11/03 23.25 0.00 -13.84 330 <100 100 8.9 4.2 5.7 <0.50 <50 <2.0 <2.0 <2.0 <2.0 <2.0 2.0 05/29/03 22.92 0.00 -13.51 900 110 240 16 10 14 <0.50 <50 <2.0 <2.0 <2.0 <2.0 <2.0 - 08/14/03 23.39 0.00 -13.98 <2,500 300 1,700 58 41 53 <25 <250 <100 <100 <100 <25 <25 11/03/03 24.33 0.00 -14.92 - - - - - - - - - - - - - 11/06/03 24.31 0.00 -14.90 700 110 510 24 16 22 <5.0 <50 <20 <20 <20 <5.0 <5.0 02/09/04 23.41 0.00 -14.00 190 85 110 6.0 7.3 9.2 <0.50 <5.0 - - - <0.50 <0.50 05/10/04 23.38 0.00 -13.97 110 <50 49 2.9 4.2 4.7 <0.50 <5.0 - - - <0.50 <0.50 08/09/04 24.35 0.00 -14.94 170 88 80 4.9 5.3 6.3 <0.50 <5.0 <2.0 <2.0 <2.0 <50 <0.50 <0.50 11/15/04 25.11 0.00 -15.70 270 54 120 7.3 7.0 7.5 <0.50 <5.0 - - - - <0.50 <0.50 02/08/05 24.12 0.00 -14.71 200 <50 87 5.8 6.8 7.1 <0.50 <5.0 <0.50 <0.50 05/09/05 21.78 0.00 -12.37 300 59 150 8.4 6.7 7.3 <0.50 <5.0 <0.50 <0.50 08/08/05 22.60 0.00 -13.19 190 73 120 6.5 7.2 6.9 <0.50 <5.0 <2.0 <2.0 <2.0 <50 <0.50 <0.50 11/07/05 23.94 0.00 -14.53 190 <50 99 6.6 6.9 6.7 <0.50 <5.0 - - - - <0.50 <0.50 02/06/06 24.98 0.00 -15.57 150 53 59 4.1 6.4 6.0 <0.50 - <0.50 <0.50 05/08/06 19.67 0.00 -10.26 230 N 72 58 4.0 6.5 5.4 <1.0 <10 <0.50 <1.0 08/07/06 18.78 0.00 -9.37 350 59 80 5.5 8.7 7.5 <0.50 <5.0 <2.0 <2.0 <2.0 <50 <0.50 <0.50 10/30/06 20.96 0.00 -11.55 260 87 99 6.4 8.0 7.1 <0.50 <5.0 - - - - <0.50 <0.50 01/29/07 21.05 0.00 -11.64 280 55 69 5.2 9.1 6.2 <0.50 <5.0 <0.50 <0.50 05/07/07 20.87 0.00 -11.46 260 <50 52 5.3 8.1 6.8 <1.0 <10 <0.50 <1.0 08/06/07 21.18 0.00 -11.77 300 N <50 43 4.9 8.4 6.5 <1.0 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 11/05/07 22.13 0.00 -12.72 460 N 130 N 150 13 15 11 <1.0 <10 - - - - <0.50 <1.0 02/04/08 20.97 0.00 -11.56 2,700 910 N 320 11 13 18 <5.0 <50 - - - - <2.5 <5.0 05/05/08 19.11 0.00 -9.70 420 81 150 13 14 12 <1.0 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 08/04/08 20.86 0.00 -11.45 - - - - - - - - - - - - - - 08/05/08 - - - 520 150 N 140 13 11 8.6 <1.0 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 10/28/08 21.95 0.00 -12.54 - - - - - - - - - - - - - - Stockton Charter Way Commingled Plume 4Q10 Tables.xlsm Page 67 of 72 Stantec