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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-4 11/03/03 8.54 23.06 0.00 -14.52 140 160 <0.50 <0.50 <0.50 <1.0 110 22 <2.0 <2.0 <2.0 <0.50 <0.50 02/09/04 22.39 0.00 -13.85 <250 720 <2.5 <2.5 <2.5 <5.0 160 <25 - - - <2.5 <2.5 05/10/04 21.96 0.00 -13.42 91 89 <0.50 1.4 <0.50 <1.0 130 10 - - - <0.50 <0.50 08/09/04 23.15 0.00 -14.61 180 170 <0.50 <0.50 <0.50 <1.0 90 15 <2.0 <2.0 <2.0 <50 <0.50 <0.50 11/15/04 23.89 0.00 -15.35 270 N 120 <0.50 <0.50 <0.50 <1.0 77 19 - - - - <0.50 <0.50 02/08/05 22.58 0.00 -14.04 180 140 1.2 <0.50 <0.50 <1.0 150 31 <0.50 <0.50 05/09/05 20.15 0.00 -11.61 170 110 <0.50 <0.50 <0.50 <1.0 110 <5.0 <0.50 <0.50 08/08/05 29.80 0.00 -21.26 140 120 <0.50 <0.50 <0.50 <1.0 63 31 <2.0 <2.0 <2.0 <50 <0.50 <0.50 11/07/05 21.75 0.00 -13.21 66 91 0.52 <0.50 <0.50 <1.0 65 25 - - - - <0.50 <0.50 02/06/06 21.11 0.00 -12.57 170 240 1.8 <0.50 <0.50 <1.0 160 55 <0.50 <0.50 05/08/06 19.17 0.00 -10.63 1,800 800 94 14 29 87 57 <10 <0.50 <1.0 08/07/06 18.53 0.00 -9.99 130 130 <0.50 <0.50 <0.50 <1.0 51 7.8 <2.0 <2.0 <2.0 <50 <0.50 <0.50 10/30/06 19.23 0.00 -10.69 61 75 <0.50 <0.50 <0.50 <1.0 39 11 - - - - <0.50 <0.50 01/29/07 19.75 0.00 -11.21 <50 93 <0.50 <0.50 <0.50 <1.0 16 <5.0 <0.50 <0.50 05/07/07 19.18 0.00 -10.64 55 N 220 0.28 <1.0 <1.0 <1.0 15 <10 <0.50 <1.0 08/06/07 19.71 0.00 -11.17 55 150 N 0.72 <1.0 <1.0 <1.0 25 9.0 k <2.0 <2.0 <2.0 <100 <0.50 <1.0 11/05/07 20.29 0.00 -11.75 59 <50 <0.50 <1.0 <1.0 <1.0 22 10 - - - - <0.50 <1.0 02/04/08 18.95 0.00 -10.41 <50 <50 <0.50 <1.0 <1.0 <1.0 1.8 <10 <0.50 <1.0 05/05/08 19.20 0.00 -10.66 - - - - - - - - - - 05/06/08 - - - <50 <50 6.3 <1.0 <1.0 <1.0 6.8 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 08/04/08 19.40 0.00 -10.86 <50 <50 <0.50 <1.0 <1.0 <1.0 3.0 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 10/28/08 20.68 0.00 -12.14 <50 <50 1.9 <1.0 <1.0 <1.0 4.9 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 01/27/09 20.60 0.00 -12.06 85 <50 <0.50 <1.0 <1.0 <1.0 11 14 <2.0 <2.0 <2.0 <100 <0.50 <1.0 04/27/09 19.18 0.00 -10.64 51 88 <0.50 <1.0 <1.0 <1.0 10 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 10/14/09 20.25 0.00 -11.71 - - - - - - - - - - - - - - 10/15/09 - - - 170 <50 <0.50 <1.0 <1.0 <1.0 1.5 <10 <2.0 <2.0 <2.0 <100 <0.50 <1.0 05/24/10 17.74 0.00 -9.20 - - - - - - - - - - - - - - 05/25/10 - - - <50 66 N <0.50 <1.0 <1.0 <1.0 2.9 11 <2.0 <2.0 <2.0 <100 <0.50 <1.0 10/04/10 11.15 18.81 0.00 -7.66 - - - - - - - 10/13/10 - <50 <50 <0.50 <0.50 <0.50 <0.50 1.2 <5.0 <0.50 <0.50 <0.50 <5.0 <0.50 SMW-5 05/10/91 10.27 39.47 0.00 -29.20 - - - - - - - - - - - - - 02/05/92 40.86 0.00 -30.59 66,000 7,000 810 690 1,400 05/15/92 40.13 0.00 -29.86 28,000 6,900 900 690 1,500 10/15/92 42.65 0.00 -32.38 - - - - - 12/17/92 42.66 0.00 -32.39 52,000 12,000 1,700 1,200 2,000 03/18/93 40.12 0.00 -29.85 42,000 6,500 570 940 1,700 06/10/93 38.51 0.00 -28.24 52,000 6,500 400 700 1,600 09/20/93 - - - 180,000 9,800 14,000 4,000 28,000 10/22/93 39.60 0.00 -29.33 - - - - - 12/22/93 39.56 0.00 -29.29 - - - - - 03/16/94 38.88 Sheen -28.61 32,000 4,100 600 820 1,500 06/15/94 38.42 0.00 -28.15 15,000 8,300 610 610 1,000 09/22/94 39.93 0.00 -29.66 49,000 8,400 1,100 590 1,300 Stockton Charter Way Commingled Plume 4Q10 Tables.xlsm Page 42 of 72 Stantec