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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-1 08/23/02 9.27 22.57 0.00 -13.30 11,000 <1,000 820 <2.5 570 980 67 130 <2.5 <2.5 <2.5 <2.5 <2.5 - 09/27/02 23.02 0.00 -13.75 - - - - - - - - - - - - - 11/13/02 23.52 0.00 -14.25 14,000 <1,700 1,300 <5.0 780 1,200 89 170 <5.0 <5.0 <5.0 <5.0 <5.0 1.3 02/11/03 22.54 0.00 -13.27 6,100 <1,300 1,300 <2.0 280 460 270 330 <2.0 <2.0 <2.0 <2.0 <2.0 1.4 05/29/03 22.15 0.00 -12.88 1,700 590 230 <0.50 79 130 190 210 <2.0 <2.0 <2.0 <2.0 <2.0 - 08/14/03 23.03 0.00 -13.76 3,000 610 470 <10 160 210 150 130 <40 <40 <40 <10 <10 11/03/03 23.71 0.00 -14.44 4,600 830 870 <10 270 340 230 210 <40 <40 <40 <10 <10 02/09/04 23.26 0.00 -13.99 8,500 840 1,500 <10 570 970 150 240 - - - <10 <10 05/10/04 22.58 0.00 -13.31 6,400 1,300 1,400 <10 520 830 150 210 - - - <10 <10 08/09/04 23.68 0.00 -14.41 2,300 460 460 <2.5 150 190 83 110 <10 <10 <10 <250 <2.5 <2.5 11/15/04 24.67 0.00 -15.40 3,700 680 290 <2.5 190 170 68 130 - - - - <2.5 <2.5 02/08/05 23.53 0.00 -14.26 2,400 560 550 3.4 100 110 93 120 <2.5 <2.5 05/09/05 20.23 0.00 -10.96 7,000 350 830 <2.5 340 570 640 760 <2.5 <2.5 08/08/05 21.65 0.00 -12.38 150 140 9.9 <0.50 5.1 6.8 96 110 <2.0 <2.0 <2.0 <50 <0.50 <0.50 11/07/05 22.77 0.00 -13.50 1,700 380 200 <0.50 120 170 51 70 - - - - <0.50 <0.50 02/06/06 22.06 0.00 -12.79 3,600 770 700 <2.5 300 450 130 150 <2.5 <2.5 05/08/06 19.57 0.00 -10.30 4,200 2,200 470 <5.0 250 360 76 <50 <2.5 <5.0 08/07/06 19.30 0.00 -10.03 1,100 190 36 <0.50 21 31 22 34 <2.0 <2.0 <2.0 <50 <0.50 <0.50 10/30/06 19.97 0.00 -10.70 2,600 410 280 <0.50 110 190 38 82 - - - - <0.50 <0.50 01/29/07 20.37 0.00 -11.10 1,400 630 88 <2.5 39 43 34 <25 <2.5 <2.5 05/07/07 19.84 0.00 -10.57 2,400 860 150 <1.0 66 75 35 <10 <0.50 <1.0 08/06/07 20.28 0.00 -11.01 2,400 670 N 170 <1.0 72 85 25 21 <2.0 <2.0 <2.0 <100 <0.50 <1.0 11/05/07 20.96 0.00 -11.69 1,800 730 N 82 <1.0 44 56 26 33 - - - - <0.50 <1.0 02/04/08 19.78 0.00 -10.51 330 110 N 4.8 <1.0 1.5 1.6 16 <10 <0.50 <1.0 05/05/08 20.30 0.00 -11.03 - - - - - - - - - - 05/06/08 - - - 1,100 130 N 69 <1.0 24 32 13 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 08/04/08 20.12 0.00 -10.85 830 85 51 <1.0 18 21 8.8 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 10/28/08 21.09 0.00 -11.82 - - - - - - - - - - - - - - 10/29/08 - - - 180 <50 1.9 <1.0 <1.0 <1.0 5.5 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 01/27/09 21.19 0.00 -11.92 3,800 330 N 320 <1.0 130 170 16 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 04/27/09 19.81 0.00 -10.54 1,400 270 N 77 <2.0 24 26 4.3 <20 <4.0 <4.0 <4.0 <200 <1.0 <2.0 10/14/09 21.05 0.00 -11.78 - - - - - - - - - - - - - - 10/15/09 - - - 320 64 N 5.2 <1.0 1.6 1.6 2.1 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 05/24/10 18.05 0.00 -8.78 - - - - - - - - - - - - - - 05/25/10 - - - 1,800 360 N 91 <1.0 33 39 4.7 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 10/04/10 11.70 19.50 0.00 -7.80 - - - - - - - 10/16/10 - <50 <50 <0.50 <0.50 <0.50 <0.50 0.99 <5.0 <0.50 <0.50 <0.50 <5.0 <0.50 SMW-2 02/05/92 11.10 40.75 0.00 -29.65 1,600 - 13 <1.0 <1.0 4.8 - - - - - - - 05/15/92 40.01 0.00 -28.91 190 2.6 0.70 <1.0 0.49 10/15/92 42.02 0.00 -30.92 - - - - - 12/17/92 42.64 0.00 -31.54 1,800 26 2.3 <1.0 12 03/18/93 40.10 0.00 -29.00 1,700 130 1.7 0.70 16 06/10/93 38.61 0.00 -27.51 1,300 92 2.4 0.80 18 Stockton Charter Way Commingled Plume 4Q10 Tables.xlsm Page 35 of 72 Stantec