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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-4 21 7/24/90 91 38.00 --- ---3.4 13 2.8 14 --- 11/17/95 23 15.00 --- ---0.46 2.1 1.4 3.1 --- 10/18/96 14 <1.0 --- <0.2 0.37 1.2 1.1 2.9 --- 1/19/99 6.93 --- --- ---0.101 (0.0849)* 0.517 (0.458)* 0.418 (0.419)* 1.07 (1.08)* --- 2/27/99 ---3.41 --- --- --- --- --- --- --- 5/20/02 16 3.6 (1.3)--- <0.3 (<0.3) <0.05 1.4 1.2 2.63 --- 9/30/02 17 <5.0 (<5.0) --- <0.1 (<0.1)0.014 1.4 1.2 2.81 --- 12/5/02 13 8.4 (7.0)--- <0.1 (<0.1)0.0064 0.74 0.89 1.81 ---3/5/03 17 <5.5 ---0.0964 <0.010 1.1 1.3 2.47 --- 5/8/03 14 9.90 ---0.1 4 0.008 0.79 1 1.84 --- 8/21/03 22 5.70 ---0.08 0.01 1.0 1.4 2.79 --- 11/13/03 16 10 4 ---0.280 4 0.0078 0.75 0.93 1.79 --- 2/20/04 19 7.00 ---0.24 16 0.0074 1.0 1.3 2.53 --- 6/3/04 14 11.00 ---0.32 4 0.007 0.59 0.9 1.72 --- 9/9/04 17 13.00 ---0.11 4 0.0078 0.71 0.86 1.77 --- 12/10/04 23 31.00 ---0.19 4 0.0041 11 0.93 1.5 3.03 --- 2/25/05 29 28 4 ---0.32 4 0.015 1.20 1.6 3.18 --- 5/26/05 18 4.2 9 ---0.056 24 0.011 0.88 1.1 2.69 --- 8/24/05 15 11.00 --- <0.05 0.0089 0.59 1 1.89 ---11/14/05 --- 2/16/06 15 <5.0 9 --- <0.05 0.0074 0.76 0.97 2.15 --- 5/15/06 --- 8/16/06 14 <4.0 9 --- <0.05 0.035 0.89 1.2 2.06 --- 11/14/06 --- 2/5/07 --- 5/7/07 --- 7/5/07 12 120 ---0.22 37 0.013 0.52 0.94 1.77 --- 10/10/07 20 98 ---0.17 28 0.022 1.1 1.4 3.16 --- 1/25/08 16 <8.0 9 --- <0.05 0.023 1.0 1.2 2.86 --- 4/21/08 --- 7/21/08 --- 10/20/08 --- 1/19/09 MW-5 23 7/24/90 7.7 0.68 --- ---0.047 0.0067 0.023 0.015 --- 10/18/96 1.2 <0.05 --- <0.2 0.004 0.094 0.074 0.31 --- 1/19/99 0.415 --- --- --- ND/ND*0.00713 (0.00549)* 0.0117 (0.011)* 0.0405 (0.0319)* --- 2/27/99 ---0.19 --- --- --- --- --- --- --- 9/2/99 0.159 0.12 --- --- <0.0025 <0.0025 <0.0025 <0.0025 --- 7/19/02 2,44,6 1.9 (1.4)--- <0.3 (<0.3) <0.017 <0.017 <0.017 <0.017 --- 9/30/02 2.0 <0.5 (<0.3) --- <0.1 (<0.1) <0.0005 <0.0005 0.017 <0.001 --- 12/5/02 3.1 <1.5 (<1.0) --- <0.05 (<0.05) <0.001 0.014 0.059 0.164 (FD) --- 12/5/02 3.5 <1.5 (<1.5) --- <0.05 (<0.05) <0.001 0.012 0.05 0.142 --- 3/5/03 3.4 <2.0 (<1.5) --- <0.05 (<0.05) <0.0005 <0.0005 0.0014 <0.001 --- 5/5/03 2.8 <2.0 (<0.07) ---0.057 4 (<0.05)<0.001 0.0088 0.074 0.19 ---8/19/03 12 2.3 <1.5 9(<0.80 9)---0.096 B4 (0.057 B4)<0.0005 0.00091 0.0078 0.0149 ---11/11/0312 3.3 <1.5 9(<0.80 9)--- <0.05(<0.05) <0.0005 <0.0005 0.0024 <0.001 ---02/18/04 12 1.8 <1.5 9 (<1.0 9)---0.08 (<0.05)<0.0005 <0.0005 0.0016 <0.001 ---6/2/04 12 2.2 <1.5 9 (<1.0 9)---0.2 (0.065)<0.001 <0.001 0.0032 0.0045 ---6/2/04 12 2.2 <1.5 9 (<1.0 9)---0.077 16 (<0.05 16)<0.001 <0.001 0.0032 0.0042 ---9/7/04 12 2.3 <1.5 9 (<1.0 9)--- <0.10 (<0.10) <0.0005 <0.0005 0.0014 <0.001 Not sampled due to Sheen Not sampled due to Sheen Not sampled due to Sheen Not sampled due to Sheen Not sampled due to Sheen Well abandoned due to Unocal Excavation 51 Not sampled due to Sheen Not sampled due to Sheen Not sampled due to Sheen I:\Tidewater\TW Stockton (P2A)\Tables\QMR Tables\2012\1Q12\20120305-Parcel2A (Tables 4,5,6,7) Historical GW Tables 1Q12-CL.xlsx Page 2 of 67