ARCHIVED REPORTS Second Quarter 2011

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TABLE 1A CUMULATIVE GROUNDWATER MONITORING AND SAMPLING DATA Former Mobil Service Station 99CAS 75 E. Alpine Avenue Stockton, California (Page 4 of 7) Well Sampling TOC DTW GW Elev. NAPL TPI -Id TPHg O&G MTBE B T E X PCBs SVOCS ID Date (feet) (feet) (feet) (feet) (pg/L) (ljgIL) (Ng/L) (Ng/L) (ug/L) (ug/L) (pg/l-) (pg/L) (pglL) (Ng/L) MW7 11/26/07 14.67 36.31 -21.64 No <47 <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW7 02/28/08 14.67 33.90 -19.23 No <47.2 <50.0 --- <0.500 <0.500 4.78 <0.500 <0.500 --- --- MW7 05/29/08 14.67 34.40 -19.73 No <47.2 <50.0 --- <0.500 <0.500 <0.500 <0.500 <0.500 --- --- MW7 08/27/08 14.67 36.93 -22.26 No <47 <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW7 11/13/08 14.67 37.24 -22.57 No <47 <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW7 01/28/09 14.67 38.05 -23.38 No <50 <50 --- <0.50 0.21i,j 0.35j 0.23i,j 0.87j --- --- MW7 04/29/09 14.67 37.80 -23.13 No <50 <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW7 07/14/09 14.67 39.60 -24.93 No <50 64 --- <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW7 10/27/09 14.67 40.01 -25.34 No <50 <50 --- <0.50 <0.50 <0.50 <0.50 0.085] --- --- MW7 01/25/10 14.67 37.90 -23.23 No <50 <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW7 04/07/10 14.67 36.05 -21.38 No <50 <50 --• <0.50 <0.50 <0.50 <0.50 0.093] --- --- MW7 08/09/10 14.67 36.00 -21.33 No <50 <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW7 10/05/10 14.67 36.80 -22.13 No <50 80d <0.50 <0.50 <0.50 <0.50 <0.50 MW7 02/09/11 14.67 36.35 -21.68 No <50m <50 <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW7 05/18/11 14.67 32.67 -18.00 No <50b <50 <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW8 07/14/09 15.45 40.74 -25.29 No <50 <50 <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW8 10/27/09 15.45 41.02 -25.57 No <50 <50 --- <0.50 <0.50 1.0 0.12j 0.81 --- --- MW8 01/25/10 15.45 38.85 -23.40 No <50 <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW8 04/07/10 15.45 37.00 -21.55 No <50 <50 --- <0.50 <0.50 <0.50 <0.50 0.15j --- --- MW8 08/09/10 15.45 37.05 -21.60 No <50 <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW8 10/05/10 15.45 37.75 -22.30 No <50 <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 --- --- MW8 02/09/11 15.45 36.50 -21.05 No <50m <50 --- <0.50 <0.50 <0.50 <0.50 0.091j --- --- MW8 05/18/11 15.45 33.55 -18.10 No <50b <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 --- .-- DW1 02/23/09 16.99 39.48 -22.49 No 59,000 <50 5,600k 12,000k 1,800k 9,800k --- --- DW1 04/29/09 16.99 39.35 -22.36 No <50 37,000 <250 2,800 6,500 870 4,600 --- --- DW1 07/14/09 16.76 41.17 -24.41 No <50 14,000 --- <50 1,200 2,500 470 2,400 --- --- DW1 10/27/09 16.76 41.44 -24.68 No 57d 8,000 --- <25 990 1,100 360 1,500 --- --- DW1 01/25/10 16.76 39.59 -22.83 No 73d 6,400 --- <12 640 590 260 1,000 --- --- DW1 04/07/10 16.76 37.65 -20.89 No <50 5,700 --- 4.1j 550 500 240 900 --- --- DW1 08/09/10 16.76 37.59 -20.83 No --- --- --- --- --- .-- --- -.- --- ... DW1 08/10/10 16.76 --- --- <50 4,400 --- <10 440 320 180 620 --- --- DW1 10/05/10 16.76 38.34 -21.58 No 73d 5,900 --- 4.5j 510 300 180 590 --- --- DW1 02/09/11 16.76 36.94 -20.18 No <50m 4,200 --- <10 350 730 100 480 --- --- DW1 05/18/11 16.76 34.04 -17.28 No --- --- --- --- --- ... --- --- ... ... DW1 05/19/11 16.76 --- --- --- 94d 7,600 --- <10 1,400 2,400 130 710 DW2 02/23/09 16.76 37.47 -20.71 No --- 970 --- <2.0 45k 55k 14k 70k DW2 04/29/09 16.76 38.67 -21.91 No <50 51 --- <0.50 1.9 1.3 0.24j 2.7 DW2 07/14/09 16.01 40.51 -24.50 No <50 60 --- <0.50 0.86 0.69 0.089j 1.0 ---