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TABLE 2 Historical Groundwater Monitoring and Analytical Data 76 ( Former BP) Service Station No, 11194 2375 North Tracy Boulevard, Tracy, CA TOC Depth to Measured Calc. SPH GW GRO T�BT E X MTBE TBA DIPE ETBE TAME Ethanol D.O. Well No. Date Notes Elevation Water Thickness Elev. (pg/L) ) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pglL) (pglL) (mg/L) Comments (ft-MSL) (feet) (feet) (ft-MSL) AMW-3 07/29/05 25.29 7.34 0.00 17.95 <50 <0.50 <0.50 <0.50 <0.50 4.6 <20 <0.50 <0.50 <0.50 <100 - 10/28/05 7.35 0.00 17.94 <50 <0.50 <0.50 <0.50 <0.50 2.8 <20 <0.50 <0.50 <0.50 <100 - 01/26/06 6.96 0.00 18.33 <50 <0.50 <0.50 <0.50 <0.50 1 .5 - - - - - - 04/27/06 6.95 0.00 18.34 <50 <0.50 2.8 <0.50 <1 .0 1 .2 <5.0 <1 .0 <0.50 <0.50 <100 - - 07/27/06 7.36 0.00 17.93 <50 <0.50 <0.50 <0.50 <1 .0 2.6 <5.0 <1 .0 <0.50 <0.50 <100 - �. 10/26/06 7.38 0.00 17.91 <50 <0.50 <0.50 <0.50 <1 .0 3.2 <5.0 <1 .0 <0.50 <0.50 <250 - 01/25/07 7.36 0.00 17.93 <50 <0.50 <0.50 <0.50 <1 .0 1 .4 <5.0 <1 .0 <0.50 <0.50 <250 - 04/24/07 27.42 7.30 0.00 20.12 <50 <0.50 <0.50 <0.50 <1 .0 0.85 <5.0 <1 .0 <0.50 <0.50 <250 - 07124/07 7.47 0.00 19.95 - - - - - - _ 07/25/07 - - - <50 <0.50 <0.50 <0.50 <1 .0 0.96 <5.0 <1 .0 <0.50 <0.50 <250 - 10/23/07 7.15 0.00 20.27 <50 <0.50 <0.50 <0.50 <1 .0 0.76 <5.0 <1 .0 <0.50 <0.50 <250 - 03/28/013 7.27 0.00 20.15 <50 <0.50 <0.50 <0.50 <1 .0 0.66 <5.0 <1 .0 <0.50 <0.50 <250 - 06/30/08 7.49 0.00 19.93 <50 <4.0 <4.0 <4.0 <4.0 0.51 <80 <4.0 <4.0 <4.0 Q50 - 08/20/08 7.62 0.00 19.80 - - - - - - - _ _ _ _ _ 08/21/08 - - - <50 <1 .0 <1 .0 <1 .0 <1 .0 <1.0 <5.0 <1 .0 <1 .0 <1 .0 <250 10/28108 7.59 0.00 19.83 <50 <1 .0 <1.0 <1.0 <1.0 <7 .0 <5.0 <1.0 <7.0 O'll <250 AMW-4 08/10/90 25.36 4.83 0.00 20.53 <50 0.50 0.70 2.9 4.2 - - - - - - 013/27/90 4.83 0.00 20.53 11/02/90 4.89 0.00 20.47 11/05/90 4.88 0.00 20.48 <50 0.30 <0.30 <0.30 <0.30 02/25/91 4.08 0.00 21 .28 <50 <0.30 <0.30 <0.30 <0.30 - - - - - - / 03/25/91 4.26 0.00 21 .10 <30 <0.30 <0.30 <0.30 <0.30 - - - - - - 1 06/27/91 5.01 0.00 20.35 <50 <0.50 <0.50 <0.50 <0.50 - - - - - - - 09/25/91 5.45 0.00 19.91 <30 <0.30 <0.30 <0.30 <0.30 - - - - - - 12/10/91 4.79 0.00 20.57 <30 <0.30 <0.30 <0.30 <0.30 06/25/92 6.16 0.00 19.20 <30 <0.30 <0.30 <0.30 <0.30 - - - - - - - 12/08192 4.74 0,00 20,62 <50 <0.50 <0.50 <0.50 <0.50 - - - - - 03/10193 4.28 0,00 21 .08 <50 <0.50 <0.50 <0.50 <0.50 - - - - - - - 06/16/93 4,06 0.00 21 .30 <50 <0.50 <0.50 <0.50 <0.50 - - - - - _ _ 10/22/93 4.85 0.00 20.51 <50 <0.50 <0.50 <0.50 <0.50 <5.0 , - - - - - 01/24/94 4,81 0.00 20.55 <50 <0.50 <0.50 <0.50 <0.50 <5.0 06/07/94 5.30 0.00 20.06 <50 <0.50 <0.50 <0.50 <0.50 <5.0 - - - - - 3.4 09/13/94 5.59 0.00 19.77 <50 <0.50 <0.50 <0.50 <0.50 <5.0 - - - - - 6.9 01/10/95 4.22 0.00 21 .14 <50 <0.50 <0.50 <0.50 <1 .0 - - - - - - 7.1 03/23/95 3.98 0.00 21 .38 <50 <0.50 <0.50 <0.50 <1 .0 - - - - - - 7.9 10/04/95 5.32 0.00 20.04 <50 <0.50 <0.50 <0.50 <1 .0 <5.0 - - - - - 5.9 01104/96 4.48 0.00 20.88 <50 <0.50 <0.50 <0.50 <1 .0 <5.O - - - - - 1 03/29/96 4.32 0.00 21 .04 <50 <0.50 <1 .0 <1 .0 <1 .0 <10 3.7 11194 4Q08 Tables.Xls Page 6 of 29 Stantec