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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) (pg/L) SMW-11 01/28/09 9.04 - - - 3,200 120 N 420 37 12 31 <10 <100 <20 <20 <20 <1,000 <5.0 <10 04/27/09 20.07 0.00 -11.03 - - - - - - - - - - - - - - 04/28/09 - - - 2,200 <50 330 26 15 36 11 <50 <10 <10 <10 <500 <2.5 <5.0 10/14/09 21.89 0.00 -12.85 - - - - - - - - - - - - - - 10/15/09 - - - 6,100 280 N 930 140 84 260 12 29 <4.0 <4.0 <4.0 <200 <1.0 <2.0 05/24/10 19.27 0.00 -10.23 - - - - - - - - - - - - - - 05/25/10 - - - 12,000 1,100 N 3,300 380 340 800 28 <100 <20 <20 <20 <1,000 <5.0 <10 10/04/10 11.39 19.53 0.00 -8.14 - - - - - - - 10/16/10 - 74 52 11 <0.50 <0.50 <0.50 2.1 12 <0.50 <0.50 <0.50 <5.0 <0.50 SMW-11-82 09/24/02 9.09 23.73 0.00 -14.64 - - - - - - - - - - - - - - 09/27/02 23.50 0.00 -14.41 770 - 110 32 15 56 3.6 <50 <2.0 <2.0 <2.0 <500 <2.0 <2.0 11/13/02 25.02 0.00 -15.93 630 <200 76 5.4 14 5.9 1.9 <50 <2.0 <2.0 <2.0 - <2.0 <2.0 2.1 02/11/03 22.15 0.00 -13.06 350 150 87 1.8 5.2 1.6 1.6 <50 <2.0 <2.0 <2.0 <2.0 <2.0 1.7 05/29/03 22.75 0.00 -13.66 290 250 66 1.6 3.3 1.7 0.96 <50 <2.0 <2.0 <2.0 <2.0 <2.0 - 08/14/03 23.57 0.00 -14.48 610 210 240 6.6 3.8 <5.0 <2.5 36 <10 <10 <10 <2.5 <2.5 11/03/03 24.24 0.00 -15.15 380 190 230 7.1 4.9 5.9 <2.5 45 <10 <10 <10 <2.5 <2.5 02/09/04 23.17 0.00 -14.08 160 160 52 2.7 2.5 2.4 1.9 9.0 - - - 2.1 <0.50 05/10/04 22.68 0.00 -13.59 230 85 110 2.6 1.8 3.3 1.6 22 2.7 <0.50 08/09/04 24.31 0.00 -15.22 300 130 170 3.7 1.7 3.4 1.5 15 1.8 <0.50 11/15/04 25.15 0.00 -16.06 470 170 <0.50 6.3 2.3 6.3 1.4 21 2.0 <0.50 02/08/05 24.08 0.00 -14.99 1,000 100 580 6.4 2.7 9.5 <2.5 29 3.4 <2.5 05/09/05 21.80 0.00 -12.71 <1,000 130 540 <10 <10 <20 <10 <100 <10 <10 08/08/05 22.40 0.00 -13.31 770 81 470 4.6 2.5 5.8 <2.5 <25 3.2 <2.5 11/07/05 23.68 0.00 -14.59 490 <50 260 6.2 3.7 5.8 <2.5 <25 3.5 <2.5 02/06/06 22.46 0.00 -13.37 410 <50 210 3.7 2.1 4.5 <1.0 <10 3.3 <1.0 05/08/06 19.79 0.00 -10.70 580 N 110 200 3.0 1.8 3.8 <2.0 <20 <1.0 <2.0 08/07/06 15.48 0.00 -6.39 610 84 200 4.2 2.5 4.9 0.76 6.2 8.1 <0.50 10/30/06 21.26 0.00 -12.17 300 140 150 1.8 <1.0 2.0 <1.0 <10 <1.0 <1.0 01/29/07 20.90 0.00 -11.81 910 140 410 4.1 2.9 4.6 0.99 <5.0 <0.50 <0.50 05/07/07 19.92 0.00 -10.83 1,200 570 690 5.1 2.8 6.0 1.1 <20 <1.0 <2.0 08/06/07 21.05 0.00 -11.96 1,700 N 160 N 720 5.1 3.5 8.6 <10 <100 <5.0 <10 11/05/07 21.94 0.00 -12.85 1,300 160 630 5.0 4.3 7.2 <5.0 <50 <2.5 <5.0 02/04/08 20.07 0.00 -10.98 770 96 N 420 5.7 <5.0 6.1 <5.0 <50 <2.5 <5.0 05/05/08 19.80 0.00 -10.71 750 64 N 310 <5.0 <5.0 5.1 <5.0 <50 <10 <10 <10 <500 <2.5 <5.0 08/04/08 20.66 0.00 -11.57 - - - - - - - - - - - - - - 08/05/08 - - - 620 <50 210 3.0 2.6 3.6 <2.0 <20 <4.0 <4.0 <4.0 <200 <1.0 <2.0 10/28/08 21.74 0.00 -12.65 770 <50 280 3.8 2.6 3.5 <2.0 <20 <4.0 <4.0 <4.0 <200 <1.0 <2.0 01/27/09 21.70 0.00 -12.61 - - - - - - - - - - - - - - 01/28/09 - - - 710 67 270 3.1 2.5 4.0 <2.0 <20 <4.0 <4.0 <4.0 <200 <1.0 <2.0 04/27/09 20.51 0.00 -11.42 - - - - - - - - - - - - - - 04/28/09 - - - 530 76 200 2.9 2.8 4.8 <2.0 <20 <4.0 <4.0 <4.0 <200 <1.0 <2.0 10/14/09 21.89 0.00 -12.80 - - - - - - - - - - - - - - 10/15/09 - - - 2,400 140 N 1,700 13 11 23 6.2 34 <4.0 <4.0 <4.0 <200 <1.0 <2.0 Stockton Charter Way Commingled Plume 4Q10 Tables.xlsm Page 57 of 72 Stantec