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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-20-83.5 11/21/07 9.67 23.89 0.00 -14.22 - - - - - - - - - - - - - - 11/30/07 22.26 0.00 -12.59 210 N 260 N 110 0.45 k 0.26 k 1.03 k <1.0 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 02/04/08 21.25 0.00 -11.58 <50 <50 2.0 <1.0 <1.0 <1.0 <1.0 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 05/05/08 20.60 0.00 -10.93 <50 <50 <0.50 <1.0 <1.0 <1.0 1.9 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 08/04/08 21.37 0.00 -11.70 - - - - - - - - - - - - - - 08/05/08 - - - 2,200 140 N 690 2.2 <1.0 4.2 5.3 30 <2.0 <2.0 <2.0 <100 <0.50 <1.0 10/28/08 22.35 0.00 -12.68 - - - - - - - - - - - - - - 10/29/08 - - - 2,600 320 N 1,200 <10 <10 <10 <10 <100 <20 <20 <20 <1,000 <5.0 <10 01/27/09 INA 04/27/09 INA 10/14/09 INA 10/15/09 22.04 0.00 -12.37 6,700 350 N 2,800 15 <10 15 24 <100 <20 <20 <20 <1,000 <5.0 <10 05/24/10 19.58 0.00 -9.91 5,900 430 N 2,600 <20 <20 <20 29 <200 <40 <40 <40 <2,000 <10 <20 10/04/10 12.09 20.63 0.00 -8.54 - - - - - - - 10/15/10 - 1,400 <200 520 2.4 1.0 1.6 34 51 1.4 <0.90 <0.90 <9.0 <0.90 SMW-21-80 11/08/07 9.12 17.25 0.00 -8.13 - - - - - - - - - - - - - - 11/30/07 21.57 0.00 -12.45 450 N 260 N 160 2.1 0.34 4.6 <1.0 <10 0.50 k <2.0 <2.0 <100 <0.50 <1.0 02/04/08 21.35 0.00 -12.23 4,700 150 N 1,300 21 <5.0 55 <5.0 <50 <10 <10 <10 <500 <2.5 <5.0 05/05/08 20.60 0.00 -11.48 4,700 130 N 1,000 25 <20 25 <20 <200 <40 <40 <40 <2,000 <10 <20 08/04/08 INA - - - - - - - - - - - - - - - - - 09/03/08 21.00 0.00 -11.88 370 67 160 3.7 <1.0 6.0 <1.0 22 <2.0 <2.0 <2.0 <100 <0.50 <1.0 10/28/08 21.58 0.00 -12.46 - - - - - - - - - - - - - - 10/29/08 - - - 3,100 140 N 580 11 1.0 20 <1.0 22 <2.0 <2.0 <2.0 <100 <0.50 <1.0 01/27/09 21.79 0.00 -12.67 2,500 110 N 300 5.9 <5.0 10 <5.0 <50 <10 <10 <10 <500 <2.5 <5.0 04/27/09 20.20 0.00 -11.08 - - - - - - - - - - - - - - 04/28/09 - - - 3,600 220 N 570 19 <5.0 30 <5.0 <50 <10 <10 <10 <500 <2.5 <5.0 07/22/09 20.75 0.00 -11.63 2,800 - 550 21 4.7 43 <0.90 29 1.3 <0.90 <0.90 - <0.90 <0.90 22.5 10/14/09 21.85 0.00 -12.73 3,700 170 N 490 17 <5.0 26 <5.0 <50 <10 <10 <10 <500 <2.5 <5.0 - 10/14/09 21.60 0.00 -12.48 2,100 - 410 15 3.2 31 <0.90 25 1.1 <0.90 <0.90 - <0.90 <0.90 A 10/14/09 - - - 2,200 400 15 3.2 30 <1.0 24 1.1 <1.0 <1.0 <1.0 <1.0 B 01/12/10 21.50 0.00 -12.38 2,800 400 16 3.1 32 <0.90 22 <0.90 <0.90 <0.90 <0.90 <0.90 5.1 05/24/10 19.26 0.00 -10.14 3,500 270 N 360 12 <5.0 14 <5.0 <50 <10 <10 <10 <500 <2.5 <5.0 - 10/04/10 11.50 20.15 0.00 -8.65 - - - - - - - 10/15/10 - 1,800 <200 290 11 1.5 24 <0.50 30 0.82 <0.50 <0.50 <20 <0.50 SMW-22-80 11/08/07 9.50 21.11 0.00 -11.61 - - - - - - - - - - - - - 11/20/07 21.80 0.00 -12.30 - - - - - - - - - - - - - 11/30/07 21.64 0.00 -12.14 970 420 N 60 4.1 1.4 9.5 <1.0 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 02/04/08 20.35 0.00 -10.85 940 190 N 28 4.2 3.0 15 <1.0 <10 <2.0 <2.0 <2.0 410 <0.50 <1.0 05/05/08 19.80 0.00 -10.30 - - - - - - - - - - - - - - 05/06/08 - - - 290 200 N 7.5 <1.0 <1.0 6.1 <1.0 27 <2.0 <2.0 <2.0 <100 1.7 <1.0 08/04/08 20.43 0.00 -10.93 - - - - - - - - - - - - - - 08/05/08 - - - 1,300 140 N 9.6 <1.0 1.1 7.4 <1.0 <10 <2.0 <2.0 <2.0 <100 1.2 <1.0 10/28/08 21.78 0.00 -12.28 - - - - - - - - - - - - - - Stockton Charter Way Commingled Plume 4Q10 Tables.xlsm Page 70 of 72 Stantec