ARCHIVED REPORTS First Quarter 2015

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TABLE 1A CUMULATIVE GROUNDWATER MONITORING AND SAMPLING DATA Former Mobil Service Station 99CAS 75 East Alpine Avenue Stockton, California (Page 7 of 13) Well Sampling TOC DTW GW Elev. NAPL TPHd TPHg O&G MTBE B T E X PCBs SVOCs ID Date (feet) (feet) (feet) (feet) (Ng/L) (ug/L) (ug/L) (Ng/L) (Ng/L) (ug/L) (Ng/L) (Ng/L) (Ng/L) (ug/L) 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 <50a <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 MW7 09/22/11 14.67 32.51 -17.84 No <50a 81 --- <0.50 15 9.5 3.3 6.8 MW7 11/30/11 14.67 31.47 -16.80 No <50a <50 ••- <0.50 0.55 0.81 <0.50 0.95 MW7 03/14/12 14.67 30.37 -15.70 No <50a <50 • •. <0.50 3.7 0.97 0.65 0.99 --• --- MW7 05/03/12 14.67 30.01 -15.34 No <50a <50 <0.50 <0.50 2.2 <0.50 1.6 MW7 08/24/12 m 14.67 --- --• - - -- - -- - - - - - MW7 10/24/12 m 14.67 -- - - -- MW7 01/30/13 14.67 30.48 -15.81 No - - --- MW7 MW7 01/31/13 14.67 --- -•• --- <50a <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 MW7 05/03/13 m 14.67 --- --- -- --- --- --- --- --- MW7 08/21/13 m 14.67 --- --- - - MW7 12/18/13 m 14.67 --- - --- -- MW7 03/19/14 14.67 30.69 -16.02 No <48a <50 --• <0.50 <0.50 <0.50 <0.50 <0.50 MW7 06/12/14 m 14.67 31.70 -17.03 No - MW7 08/01/14 m 14.67 .-- -- MW7 10/28/14 m 14.67 -- - - MW7 02/05/15 14.67 35.07 -20.40 No --- --- --- --- --- MW7 02/06/15 14.67 --- -- --- <50a <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 <50a <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 - MW8 09/22/11 15.45 33.42 -17.97 No <50a 82 <0.50 16 9.9 3.3 6.6 MW8 11/30/11 15.45 32.37 -16.92 No <50a <50 <0.50 <0.50 1.5 <0.50 <0.50 MW8 03/14/12 15.45 31.26 -15.81 No <50a <50 - <0.50 0.53 <0.50 <0.50 <0.50 MW8 05/03/12 15.45 Well inaccessible. MW8 08/24/12 m 15.45 --- --- --- -- --- --- --- --- --- --- MW8 10/24/12 m 15.45 --- .-- --- - --- MW8 MW8 01/30/13 15.45 31.39 -15.94 No - --- -- --- --- -•- ••- --- MW8 01/31/13 15.45 --• --- <50a <50 <0.50 <0.50 <0.50 <0.50 <0.50 --• --- MW8 05/03/13 m 15.45 ..- .-. .-• -•- MW8 08/21/13 m 15.45 - --- ••. - --- --- MW8 12/18/13 m 15.45 --- --• --- --- --- -- --- --- --- --- --- MW8 03/19/14 15.45 31.58 -16.13 No <48a <50 <0.50 <0.50 <0.50 <0.50 <0.50 --- MW8 06/12/14 m 15.45 31.48 -16.03 No .