ARCHIVED REPORTS Second Quarter 2011

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TABLE 1 B ADDITIONAL CUMULATIVE GROUNDWATER MONITORING AND SAMPLING DATA Former Mobil Service Station 99CAS 75 E. Alpine Avenue Stockton, California (Page 1 of 6) Well Sampling DIPE ETBE TAME TBA 1,2 -DCA EDB Ethanol Methanol I❑ Date (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) MW1 03/26/07 <20 <20 <20 <20 11 <20 <100 <100 MW1 06/28/07 <20 <20 <20 <20 8.7 <20 <100 <100 MW1 09/12/07 <20 <20 <20 <20 7.2 <20 <100 <100 MW1 11/26/07 <20 <20 0.61 <20 6.6 <20 <100 <100 MW1 02/28/08 <10.0 <10.0 <0.500 <10.0 8.14 <10.0 <100 <5,000 MW9 05/29/08 <10.0 <10.0 <0.500 <10.0 6.22 <10.0 <100 41,800 MW1 08/27/08 <20 <20 <0.50 <20 3.1 <20 <100 <100 MW1 11/13/08 <20 <20 <0.50 <20 4.0 <20 <100 <100 MW1 01/28/09 3.1j <0.50 <0.50 3.1j 4.1 3.1j <50 <100 MW1 04/29/09 2.2j <0.50 <0.50 2.2j 3.9 2.2j <50 <100 MW1 07/14/09 <10 <10 <0.50 <10 3.6 <10 <50 <100 MW1 10/28/09 <10 <10 <0.50 <10 7.9 <10 <50 <100 MW1 01/25/10 <10 <10 <0.50 <10 8.2 <10 <50 <100 MW1 04/07/10 <0.50 <0.50 <0.50 <10 <0.50 <0.50 <50 <100 MW1 08/10/10 <0.50 <0.50 <0.50 4.2j <0.50 <0.50 <50 <100 MW1 10/06/10 <0.50 <0.50 <0.50 <10 <0.50 <0.50 <50 <100 MWIl 02/09/11 <0.50 <0.50 <0.50 7.4c,j 5.8 <0.50 <50 <100 MW1 05/18/11 <0.50 <0.50 <0.50 <5.0 1.5 <0.50 --- --- MW2 03/26/07 <20,000 <20,000 <20,000 <20,000 <20,000 <20,000 <100,000 <1,000 MW2 06/28/07 <100 <100 <100 <4,000 120 <100 <20,000 <1,000 MW2 09/12/07 <120 <120 <120 <5,000 130 <120 <25,000 <100 MW2 11/26/07 <250 <250 <250 <10,000 <250 <250 <50,000 <100 MW2 02/28/08 <0.500 <0.500 <0.500 497 <0.500 <0.500 <100 <5,000 MW2 05/29/08 <0.500 <0.500 <0.500 266 <0.500 <0.500 <100 <5,000 MW2 08/27/08 <10 <10 <10 <400 <10 <10 <2,000 <1,000 MW2 11/13/08 <25 <25 <25 <1,000 <25 <25 <5,000 <1,000 MW2 01/28/09 <50 <50 <50 <1,000 <50 <50 <5,000 <100 MW2 04/29/09 <500 <500 <500 <10,000 <500 <500 <50,000 <100 MW2 07/14/09 <500 <500 <500 <10,000 <500 <500 <50,000 270 MW2 10/28/09 <500 <500 <500 <10,000 <500 <500 <50,000 <100 MW2 01/25/10 <250 <250 <250 <5,000 <250 <250 <25,000 <100 MW2 04/07/10 <250 <250 <250 <5,000 --- --- <25,000 <100 MW2 08/10/10 <250 <250 <250 <5,000 --- --- <25,000 <100 MW2 10/06/10 <250 <250 <250 <5,000 --- --- <25,000 <100 MW2 02/09/11 <100 <100 <100 <2,000 <100 <100 <10,000 <100 MW2 05/19/11 <50 <50 <50 <500 <50 <50 --- --- MW3 03/26/07 <1,000 <1,000 <1,000 <1,000 <1,000 <1,000 <5,000 <100 MW3 06/28/07 <20 <20 <20 <20 2.7 <20 <100 <100 MW3 09/12/07 <20 <20 <20 <20 3.5 <20 <100 <100 MW3 11/26/07 <20 <20 <20 <20 3.3 <20 <100 <100 MW3 02/28/08 <10.0 <10.0 <10.0 <10.0 3.70 <10.0 <100 <5,000