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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-7S 10/31/97 - 20.56 0.00 100,000 19,000 17,000 2,200 8,000 120 <50 <50 <50 <10 - - 2.0 01/16/07 20.56 0.00 32,000 12,000 260 150 260 41 <150 <25 <25 <25 <25 <25 14.5 04/13/07 20.05 0.00 31,000 14,000 87 140 100 72 <150 <25 <25 <25 - - 1.2 07/23/07 11.06 20.31 0.00 -9.25 33,000 19,000 180 360 290 180 <150 <25 <25 <25 <25 - 0.6 10/16/07 21.18 0.00 -10.12 30,000 13,000 94 190 200 150 <150 <25 <25 <25 <25 <25 - 01/15/08 20.80 0.00 -9.74 22,000 9,200 64 99 110 99 <90 <20 <20 <20 <20 <20 04/14/08 19.25 0.00 -8.19 23,000 12,000 130 140 180 120 <90 <20 <20 <20 <20 <20 07/15/08 19.87 0.00 -8.81 22,000 11,000 63 94 91 87 <90 <20 <20 <20 <20 <20 10/28/08 21.24 0.00 -10.18 21,000 9,200 58 99 98 85 <90 <20 <20 <20 <20 <20 0.3 01/27/09 21.11 0.00 -10.05 16,000 7,600 39 58 67 84 <70 <15 <15 <15 <15 <15 0.6 04/27/09 19.81 0.00 -8.75 22,000 9,400 48 66 67 57 <70 <15 <15 <15 <15 <15 2.0 07/22/09 20.35 0.00 -9.29 22,000 9,600 52 74 75 57 <70 <15 <15 <15 <15 <15 1.3 10/14/09 21.11 0.00 -10.05 20,000 9,500 47 66 63 60 <70 <15 <15 <15 <15 <15 3.2 01/12/10 20.91 0.00 -9.85 22,000 8,600 54 86 81 50 <70 <15 <15 <15 <15 <15 1.9 05/24/10 18.63 0.00 -7.57 16,000 12,000 62 130 110 260 <200 <40 <40 <40 <10 <20 - 09/03/10 19.73 0.00 -8.67 16,000 8,200 42 89 54 95 91 <10 <10 <10 <10 <10 0.7 09/03/10 DUP 19.73 0.00 -8.67 1,400 620 260 430 6.0 16 31 160 200 <0.90 <0.90 <0.90 <50 <400 <0.90 - 0.7 Duplicate 3 10/04/10 11.33 19.70 0.00 -8.37 - - - - - - - - 10/12/10 - 21,000 11,000 74 180 140 140 94 <10 <10 <10 <10 <10 0.9 SLMW-7D 10/31/97 - - - 10,000 1,300 1,200 220 1,000 <50 <50 <50 <50 <10 - - - 01/12/07 20.51 0.00 - - - - - - - - - - - - 2.0 01/16/07 20.60 0.00 480 120 1.8 4.8 9.9 <0.50 9.3 <0.50 <0.50 <0.50 0.52 <0.50 2.4 04/13/07 20.05 0.00 810 370 12 12 28 4.4 10 <0.50 <0.50 <0.50 - - 2.3 07/23/07 11.09 20.43 0.00 -9.34 2,000 710 18 25 54 6.7 11 <0.90 <0.90 <0.90 0.92 - 0.8 10/16/07 21.25 0.00 -10.16 2,700 1,200 23 35 77 9.1 11 <2.0 <2.0 <2.0 <2.0 <2.0 - 01/15/08 20.65 0.00 -9.56 1,200 440 7.4 14 32 3.7 10 <0.50 <0.50 <0.50 1.5 <0.50 04/14/08 19.30 0.00 -8.21 540 130 3.2 12 28 1.4 10 <0.50 <0.50 <0.50 1.2 <0.50 07/14/08 19.95 0.00 -8.86 - - - - - - - - - - - - 07/15/08 - - - 930 290 4.1 14 26 2.6 12 <0.50 <0.50 <0.50 1.3 <0.50 10/28/08 21.30 0.00 -10.21 1,400 370 6.8 31 55 5.0 12 <0.50 <0.50 <0.50 1.4 <0.50 0.1 01/27/09 21.16 0.00 -10.07 1,400 540 7.7 39 61 5.4 10 <0.90 <0.90 <0.90 1.3 <0.90 0.9 04/27/09 19.85 0.00 -8.76 1,000 330 6.7 42 62 2.0 11 <0.80 <0.80 <0.80 1.2 <0.80 2.4 07/22/09 20.42 0.00 -9.33 600 180 2.7 13 18 2.2 10 <0.50 <0.50 <0.50 1.2 <0.50 3.6 10/14/09 21.16 0.00 -10.07 1,400 630 9.3 48 64 4.3 13 <0.50 <0.50 <0.50 1.2 <0.50 3.5 01/12/10 21.00 0.00 -9.91 800 180 3.1 18 26 1.9 9.8 <0.50 <0.50 <0.50 1.2 <0.50 2.5 05/24/10 18.70 0.00 -7.61 860 620 5.2 13 8.6 8.0 <50 <10 <10 <10 <2.5 <5.0 - 10/04/10 11.34 19.79 0.00 -8.45 - - - - - - 10/12/10 - 2,700 1,400 20 43 39 14 17 <2.5 <2.5 <2.5 <2.5 <2.5 1.0 SLMW-8-87 07/22/09 11.05 20.29 0.00 -9.24 290 0.55 <0.50 <0.50 <0.50 9.9 22 <0.50 <0.50 <0.50 <0.50 <0.50 0.6 10/14/09 21.08 0.00 -10.03 260 <0.50 <0.50 <0.50 <0.50 12 20 <0.50 <0.50 <0.50 <0.50 <0.50 3.9 01/12/10 20.90 0.00 -9.85 350 <0.50 <0.50 <0.50 <0.50 16 22 <0.50 <0.50 <0.50 <0.50 <0.50 2.3 05/24/10 18.57 0.00 -7.52 360 <0.50 <1.0 <1.0 <1.0 21 27 <2.0 <2.0 <2.0 <0.50 <1.0 - 10/04/10 11.27 - - - - - - - - - - - - - Stockton Charter Way Commingled Plume 4Q10 Tables.xlsm Page 32 of 72 Stantec