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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) SLMW-1 04/13/07 DUP 9.77 - - - 6,300 410 48 320 240 160 24 <0.90 <0.90 <0.90 - 07/23/07 11.05 19.19 0.00 -8.14 11,000 820 110 310 260 34 17 <1.5 <1.5 <1.5 3.1 0.7 07/23/07 DUP - - - 10,000 800 98 300 270 28 16 <1.5 <1.5 <1.5 2.2 - 10/16/07 20.58 0.00 -9.53 13,000 1,400 200 450 410 45 16 <2.5 <2.5 <2.5 <2.5 <2.5 10/16/07 DUP - - - 10,000 1,200 180 400 350 50 18 <2.5 <2.5 <2.5 <2.5 <2.5 01/15/08 20.05 0.00 -9.00 9,000 1,100 120 360 390 39 20 <2.5 <2.5 <2.5 <2.5 <2.5 01/15/08 DUP - - - 6,200 740 76 230 240 29 <15 <2.5 <2.5 <2.5 <2.5 <2.5 04/14/08 18.86 0.00 -7.81 8,900 800 82 280 300 30 17 <1.5 <1.5 <1.5 <1.5 <1.5 04/14/08 DUP - - - 8,100 710 74 280 290 32 14 <1.5 <1.5 <1.5 <1.5 <1.5 07/14/08 19.18 0.00 -8.13 - - - - - - - - - - - - 07/15/08 - - - 16,000 1,500 190 620 790 32 26 <2.5 <2.5 <2.5 <2.5 <2.5 07/15/08 DUP - - - 3,600 390 28 45 66 29 16 <0.50 <0.50 <0.50 <0.50 <0.50 10/28/08 20.78 0.00 -9.73 7,800 690 36 160 110 16 9.2 <1.5 <1.5 <1.5 <1.5 <1.5 10/28/08 DUP - - - 9,800 720 44 210 150 16 11 <1.5 <1.5 <1.5 <1.5 <1.5 2.4 01/27/09 20.61 0.00 -9.56 8,300 840 54 170 160 17 8.5 <1.5 <1.5 <1.5 <1.5 <1.5 5.1 01/27/09 DUP - - - 8,400 850 56 180 170 16 8.8 <1.5 <1.5 <1.5 <1.5 <1.5 - 04/27/09 19.42 0.00 -8.37 6,800 800 42 120 140 18 10 <1.5 <1.5 <1.5 <1.5 <1.5 1.7 04/27/09 DUP - - - 7,100 730 38 120 130 16 9.1 <1.5 <1.5 <1.5 <1.5 <1.5 - 07/22/09 19.86 0.00 -8.81 7,500 940 38 110 130 19 12 <1.5 <1.5 <1.5 <1.5 <1.5 1.9 07/22/09 DUP - - - 3,200 380 11 25 33 13 8.2 <0.50 <0.50 <0.50 <0.50 <0.50 - 10/14/09 20.50 0.00 -9.45 5,500 680 22 53 48 14 8.2 <1.5 <1.5 <1.5 <1.5 <1.5 3.8 10/14/09 DUP - - - 6,000 650 22 57 54 9.6 8.2 <0.5 <0.5 <0.5 <0.5 <0.5 - 01/12/10 20.45 0.00 -9.40 6,000 700 32 88 91 11 10 <1.0 <1.0 <1.0 <1.0 <1.0 1.7 01/12/10 DUP - - - 6,500 770 36 98 100 13 11 <1.0 <1.0 <1.0 <1.0 <1.0 - 05/24/10 18.20 0.00 -7.15 13,000 1,300 42 110 110 <10 <100 <20 <20 <20 <5.0 <10 05/24/10 DUP - - - 11,000 1,100 36 93 94 <10 <100 <20 <20 <20 <5.0 <10 09/03/10 19.70 0.00 -8.65 3,000 450 13 52 32 8.4 11 <0.80 <0.80 <0.80 <0.80 <0.80 1.4 09/03/10 DUP 19.70 0.00 -8.65 4,400 <5,000 320 62 1.0 11 4.6 1.4 11 <0.50 <0.50 <0.50 <20 <50 <0.50 - 1.4 Duplicate 4 10/04/10 11.27 19.00 0.00 -7.73 - - - - - - - - 10/12/10 - 1,300 130 1.6 2.8 0.83 2.4 <2.0 <0.50 <0.50 <0.50 <0.50 <0.50 0.8 SLMWAA 07/23/07 11.18 20.28 0.00 -9.10 1,600 3.9 0.52 6.2 8.3 5.9 <5.0 <0.50 <0.50 <0.50 <0.50 - 1.0 10/16/07 21.20 0.00 -10.02 830 3.1 <0.50 1.2 1.3 4.9 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 - 01/15/08 20.60 0.00 -9.42 590 0.65 <0.50 0.58 0.57 3.4 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 04/14/08 19.27 0.00 -8.09 570 <0.50 <0.50 0.52 <0.50 3.3 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 07/15/08 19.89 0.00 -8.71 480 <0.50 <0.50 <0.50 <0.50 1.7 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 10/28/08 21.24 0.00 -10.06 390 <0.50 <0.50 <0.50 <0.50 1.3 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 0.1 01/27/09 21.13 0.00 -9.95 400 <0.50 <0.50 <0.50 <0.50 0.85 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 5.5 04/27/09 19.84 0.00 -8.66 270 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 1.0 07/22/09 20.38 0.00 -9.20 230 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 2.8 10/14/09 21.13 0.00 -9.95 240 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 1.6 01/12/10 20.96 0.00 -9.78 290 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 2.5 05/24/10 18.65 0.00 -7.47 130 <0.50 <1.0 <1.0 <1.0 <1.0 <10 <2.0 <2.0 <2.0 <0.50 <1.0 - 10/04/10 11.41 20.00 0.00 -8.59 - - - - - - - - - - - - Stockton Charter Way Commingled Plume 4Q10 Tables.xlsm Page 30 of 72 Stantec