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Table 4 Groundwater Analytical Data - Total Petroleum Hydrocarbons and BTEX South Shore Parcels - Parcel 2A and Adjacent Areas West Weber Avenue and North Lincoln Street Stockton, California Depth Ethyl- Sample (feet, Date TPHg TPHd TPHk TPHo Benzene Toluene benzene Xylenes ID bgs) Sampled (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) A Zone Wells - Area 2A/2B and Adjacent Areas (cont.) MW-10 (cont.) --- 11/14/06 --- 2/5/07 --- 5/7/07 --- 7/3/07 --- 10/8/07 --- 1/21/08 --- 4/21/08 --- 7/21/08 --- 10/20/08 --- 1/19/09 MW-11 --- 10/18/96 0.19 1.30 --- <0.20 <0.0005 <0.0005 <0.0005 <0.002 --- 1/19/99 0.3 ------ --- <0.0005 (ND)*0.0169 (0.0153)* 0.0224 (0.0224)* 0.0729 (0.07299)* --- 2/27/99 ---0.66 --- --- --- --- --- --- --- 7/19/02 0.164,6 3.44,6 (0.17)4,5 ---0.594,5 (<0.3)<0.005 <0.005 <0.005 <0.005 --- 9/30/02 0.18 0.45 (0.2)--- <0.1 (<0.1) <0.0005 <0.0005 <0.0005 <0.001 --- 12/5/02 1.1 0.78 (0.36)--- <0.05 (<0.05) <0.0005 0.031 0.1 0.287 --- 3/5/03 0.18 0.67 (0.30)--- <0.05 (<0.05) <0.0005 <0.0005 <0.0005 <0.001 --- 5/5/03 0.23 2.6 (0.15)---0.13 4 (<0.05)<0.0005 <0.0005 <0.0005 <0.001 ---8/19/03 12 0.16 2.20 (0.66)---0.084 B4 (<0.05)<0.0005 <0.0005 0.0036 0.0094 ---11/11/03 12, 15 0.094 1.24 (0.064)---0.0554 (<0.054)<0.0005 <0.0005 <0.0005 <0.001 ---02/17/04 12 0.16 2.5 (0.32)---0.098 (<0.05)<0.0005 <0.0005 <0.0005 <0.001 ---6/2/04 12 0.091 2.8 (0.50)---0.18 16(<0.05 16)<0.0005 <0.0005 <0.0005 <0.001 ---9/7/04 12 0.18 0.83 (0.39)--- <0.1 (<0.1) <0.0005 <0.0005 <0.0005 <0.001 ---12/6/04 23 0.14 0.83 --- <0.10 <0.0005 <0.0005 <0.0005 <0.001 ---2/2/05 23 0.098 0.81 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 5/25/05 0.09 0.68 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 8/24/05 0.11 0.76 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 11/17/05 0.16 1.0 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 2/14/06 0.088 0.34 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 5/15/06 0.09 0.59 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 8/14/06 0.098 0.68 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 11/14/06 0.088 0.87 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 2/5/07 0.13 1.0 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 5/7/07 0.11 0.97 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 7/2/07 0.056 0.68 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 10/8/07 0.075 0.64 ---0.052 36 <0.0005 <0.0005 <0.0005 <0.0015 --- 1/21/08 0.089 0.59 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 4/21/08 0.068 0.82 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 7/21/08 --- 10/20/08 ---1/19/09 2AMW-12 --- 10/14/99 1.2 3.00 --- <0.5 0.0046 0.0085 0.00064 0.0092 --- 5/20/02 0.714 11 (5.2)---0.834,5 (<0.3)<0.005 <0.005 <0.005 <0.005 --- 9/30/02 0.42 11 (10)--- <0.1 (<0.1) <0.0005 <0.0005 0.0017 0.006 --- 12/5/02 0.4 4.7 (2.5)--- <0.1 (<0.1) <0.0005 0.00098 <0.0005 0.00245 --- 3/5/03 0.32 3.4 ---0.0984 <0.0005 0.00053 <0.0005 0.0011 --- 5/8/03 0.35 8.4 ---0.18 4 <0.0005 <0.0005 <0.0005 0.0011 --- 8/20/03 0.47 8.6 ---0.24 4 <0.0005 0.00054 <0.0005 0.0013 --- 11/12/03 0.35 12.0 ---0.37 4 <0.0005 <0.0005 <0.0005 0.0011 --- 2/20/04 0.40 12.0 ---0.35 16 <0.0005 0.00062 <0.0005 0.0013 Not sampled due to Sheen Not sampled due to Sheen Well abandoned due to Unocal Excavation 51 Well not sampled 45 Not sampled due to Sheen Well not sampled 45 Not sampled due to Sheen Not sampled due to SPH Not sampled due to SPH Not sampled due to Sheen Not sampled due to Sheen Not sampled due to Sheen Well abandoned due to Unocal Excavation 51 I:\Tidewater\TW Stockton (P2A)\Tables\QMR Tables\2012\1Q12\20120305-Parcel2A (Tables 4,5,6,7) Historical GW Tables 1Q12-CL.xlsx Page 7 of 67