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 10 of 13) Well Sampling TOC DTW GW Eley. NAP TPHd TPHg O&G MTBE B T E X PCBs SvoCs ID Date (feet) (feet) (feet) (feet) (ug/L) (Ng/L) (Ng/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) DW3 03/14/12 16.99 32.31 -15.32 No --- --- ••- - --- - - -- DW3 03/15/12 16.99 -- --- - 130a,d 2,700d .-- <50 75 <50 <50 <50 --- DW3 05/03/12 16.99 32.11 -15.12 No 1,500a,d 36,OOOd •-• <50 59 <50 <50 <50 --- --- DW3 08/24/12 16.99 33.84 -16.85 No 480a,d 5,500d .-• <100 <100 <100 <100 <100 --- --- DW3 10/24/12 16.99 34.10 -17.11 No 270a,d 8,700d --- 3.0 49 7.1 2.9 7.1 - DW3 01/30/13 16.99 32.46 -15.47 No - DW3 01/31/13 16.99 ••. --- 95a,d 5,600d <40 56 <40 <40 <40 - - DW3 05/03/13 16.99 32.32 -15.33 No 120a,d 920d <40 160 <40 <40 <40 -- DW3 08/21/13 16.99 33.37 -16.38 No <50a <50 - <0.50 <0.50 0.56 <0.50 0.59 --- DW3 12/18/13 16.99 33.68 -16.69 No <50a <50 --- <0.50 <0.50 1.1 0.60 3.2 --- DW3 03/19/14 16.99 32.71 -15.72 No --- --- --- --_ W DW3 03/20/14 16.99 --- ... 130a,d <50 <0.50 <0.50 <0.50 <0.50 <0.50 DW3 06/12/14 m 16.99 32.37 -15.38 No .-- --- --- --- •-- •-- --- DW3 08/01/14 m 16.99 -- DW3 10/28/14 m 16.99 - DW3 02/05/15 p 16.99 --- -- --- --- - --- --- --- --- --- --- --- DW3 02/25/15 16.99 36.98 -19.99 No <48a <50 <0.50 <0.50 <0.50 <0.50 <0.50 - DW4 07/14/09 15.98 41.30 -25.32 No <50 <50 --- 0.81 <0.50 <0.50 <0.50 <0.50 --- --- DW4 10/27/09 15.98 41.54 -25.56 No <50 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50 DW4 01/25/10 15.98 39.37 -23.39 No <50 <50 --- <0.50 <0.50 <0.50 <0.50 <0.50 - - DW4 04/07/10 15.98 37.47 -21.49 No <50 <50 <0.50 <0.50 <0.50 <0.50 <0.50 --- DW4 08/09/10 15.98 37.55 -21.57 No <50 <50 <0.50 <0.50 <0.50 <0.50 <0.50 - DW4 10/05/10 15.98 38.29 -22.31 No <50 48j,d <0.50 <0.50 <0.50 <0.50 <0.50 DW4 02/09/11 15.98 36.86 -20.88 No <50a <50 - <0.50 <0.50 <0.50 <0.50 <0.50 - DW4 05/18/11 15.98 34.02 -18.04 No <50b <50 -- <0.50 <0.50 <0.50 <0.50 <0.50 - DW4 09/22/11 15.98 33.88 -17.90 No <50a 60 - <0.50 11 7.1 2.7 5.7 DW4 11/30/11 15.98 32.81 -16.83 No <50a 56 --- <0.50 3.1 6.4 2.6 7.9 DW4 03/14/12 15.98 31.69 -15.71 No <50a 53 -•- <0.50 6.4 2.0 1.4 3.1 --- DW4 05/03/12 15.98 Well inaccessible. DW4 08/24/12 m 15.98 - - - - - DW4 10/24/12 m 15.98 --- -- - -- - - DW4 01/30/13 15.98 31.83 -15.85 No .-• - --- DW4 DW4 01/31/13 15.98 --- --- .-• <50a <50 - <0.50 <0.50 <0.50 <0.50 <0.50 --- --- DW4 05/03/13 m 15.98 --- --- --- --- --- --- DW4 08/21/13 m 15.98 - - DW4 12/18/13 m 15.98 --- --- - --- - --- --- -- DW4 03/19/14 15.98 32.03 -16.05 No <48a <50 <0.50 <0.50 <0.50 <0.50 <0.50 - DW4 06/12/14 m 15.98 31.92 -15.94 No -- •-• - -- -- --- -- DW4 08/01/14 m 15.98 -•• --- - ••• --- DW4 10/28/14 m 15.98 --- --- --- --- --- --- -- DW4 02/05/15 15.98 36.40 -20.42 No <50a <50 <0.50 <0.50 <0.50 <0.50 <0.50 ---