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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/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) B Zone Wells-Areas 2A/2B And Adjacent Areas(cont.) MW-41 (cont.) --- 5/18/06 0.34 1.20 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 8/17/06 0.38 0.88 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 11/15/06 0.33 1.30 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 5/8/07 0.19 1.1 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 7/5/07 0.30 1.1 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 10/9/07 0.29 1.2 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 1/23/08 0.30 1.4 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 4/23/08 0.42 1.6 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 7/23/08 0.26 1.5 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 10/21/08 0.36 1.2 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 1/19/09 Well abandoned due to Unocal Excavation 51 MW-42 --- 6/3/04 0.088 0.15 --- 0.060 4 <0.0005 <0.0005 <0.0005 <0.001 --- 9/8/04 0.42 0.16 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 12/9/04 0.27 0.18 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 2/24/05 0.23 0.10 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 5/26/05 0.20 0.088 --- <0.05 <0.0005 <0.0005 <0.0005 0.00059 --- 8/24/05 0.18 0.12 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 11/16/05 0.34 <0.209 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 2/15/06 0.20 0.11 --- <0.05 <0.0005 <0.0005 <0.0005 0.00069 --- 5/18/06 0.30 <0.20 s --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 8/17/06 0.28 <0.10 s --- <0.05 0.00088 <0.0005 <0.0005 0.00054 --- 11/16/06 0.32 0.091 --- <0.05 <0.0005 <0.0005 <0.0005 <0.00110 --- 2/8/07 0.33 0.14 --- <0.05 <0.0005 <0.0005 <0.0005 0.00067 --- 5/8/07 20 29 0.083 --- <0.05 <0.003 <0.003 <0.003 <0.006 --- 7/3/07 Not sampled-no access agreement --- 10/8/07 Not sampled-no access agreement --- 1/24/08 0.22 0.081 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 4/23/08 0.32 <0.20 s --- <0.05 <0.0005 <0.0005 <0.0005 0.00055 --- 7/24/08 0.15 0.082 41 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 10/22/08 0.19 0.135 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 1/21/09 0.23 <0.20 35 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 4/22/09 0.34 <0.10 48 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 7/29/09 0.39 <0.2 48 --- <0.05 <0.0005 <0.0005 <0.0005 0.00062 --- 10/21/09 0.32 0.11 --- <0.05 <0.0005 <0.0005 <0.0005 0.00060 --- 1/20/10 0.10 0.052 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 --- 4/21/10 0.22 0.1341 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 --- 7/21/10 0.20 <0.148 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 --- 10/20/10 0.25 <0.148 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 Stantec I:\Tidewater\TW Stockton(Parcel 2A-0415)\Tables\QMR Tables\2010\4Q10\20101117-Parcel2A(Tables 4,5,6,7)Historical GW Tables 4Q10.xls Page 41 of 67