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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-20 (cont.) --- 1/21/09 0.48 3.8 ---0.09 28 <0.0005 <0.0005 <0.0005 <0.001 --- 4/22/09 0.50 2.9 <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 7/29/09 0.44 2.0 --- <0.05 <0.0005 <0.0005 <0.0005 0.00054 --- 10/20/09 0.37 3.9 ---0.067 37 <0.0005 11 <0.0005 <0.0005 <0.0005 --- 1/21/10 0.47 3.6 ---<0.05 <0.0005 <0.0005 <0.0005 <0.0005 --- 4/20/10 0.53 2.5 ---<0.05 <0.0005 <0.0005 <0.0005 <0.0005 --- 7/22/10 0.45 2.7 ---<0.05 <0.0005 <0.0005 <0.0005 0.00060 --- 10/21/10 0.49 3.3 ---<0.05 <0.0005 <0.0005 <0.0005 <0.0005 ---1/27/11 0.54 2.7 ---<0.05 <0.0005 <0.0005 <0.0005 <0.0005 ---4/21/11 0.45 2.3 ---<0.05 <0.0005 <0.0005 <0.0005 <0.0005 --- 7/21/11 0.40 2.8 ---<0.05 <0.0005 <0.0005 <0.0005 <0.0005 --- 10/20/11 0.36 3.1 ---0.078 42 <0.0005 <0.0005 <0.0005 <0.0005 ---1/18/12 0.42 2.8 ---<0.05 <0.0005 <0.0005 <0.0005 <0.0005 MW-21 --- 4/15/03 0.17 3.5 ---0.14 4 <0.0005 <0.0005 <0.0005 <0.001 --- 5/7/03 0.12 12 ---0.83 4 <0.0005 <0.0005 <0.0005 <0.001 --- 8/20/03 0.22 9.1 ---0.56 4 <0.0005 <0.0005 <0.0005 <0.001 --- 11/13/03 0.28 10 ---1.20 4 <0.0005 <0.0005 <0.0005 <0.001 --- 2/20/04 0.42 7.6 ---0.31 16 <0.0005 <0.0005 <0.0005 <0.001 --- 6/1/04 --- 9/28/04 0.058 5.7 ---0.37 4 <0.0005 <0.0005 <0.0005 <0.001 --- 12/9/04 0.17 5.8 ---0.50 16 <0.0005 <0.0005 <0.0005 <0.001 --- 2/22/05 --- 5/26/05 0.13 5.7 ---0.430 24 0.0032 <0.0005 <0.0005 <0.0005 --- 8/24/05 0.11 4.5 ---0.43 24 0.00089 <0.0005 <0.0005 <0.001 --- 11/16/05 0.087 1.1 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0015 --- 2/15/06 0.081 1.1 --- <0.05 0.0007 <0.0005 <0.0005 <0.001 --- 5/18/06 0.12 1.4 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 8/16/06 0.10 1.2 ---0.062 28 <0.0005 0.00084 <0.0005 <0.0015 ---11/16/06 20 0.20 0.88 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 30 --- 2/9/07 0.096 2.1 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 5/8/07 0.11 2.8 ---0.14 28 0.00067 <0.0005 <0.0005 <0.001 --- 7/5/07 0.21 1.9 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 10/8/07 --- 1/24/08 0.095 1.7 --- <0.05 <0.0005 11 <0.0005 <0.0005 <0.001 --- 4/23/08 0.12 2.4 ---0.20 <0.0005 <0.0005 <0.0005 <0.001 --- 7/24/08 <0.05 1.6 ---0.062 <0.0005 <0.0005 <0.0005 <0.001 --- 10/22/08 0.078 1.4 --- <0.05 <0.0005 <0.0005 <0.0005 <0.001 --- 1/21/09 <0.05 1.4 ---0.13 28 <0.0005 <0.0005 <0.0005 <0.001 --- 4/21/09 <0.05 1.0 ---0.08 37 <0.0005 <0.0005 <0.0005 <0.001 --- 7/29/09 <0.05 1.6 ---0.087 37 <0.0005 <0.0005 <0.0005 <0.0005 --- 10/20/09 <0.05 1.0 ---0.072 37 <0.0005 <0.0005 <0.0005 <0.0005 --- 1/21/10 <0.05 0.96 ---0.057 37 <0.0005 <0.0005 <0.0005 <0.0005 --- 4/21/10 <0.05 0.90 ---<0.05 <0.0005 <0.0005 <0.0005 <0.0005 --- 7/20/10 <0.05 0.76 ---<0.05 <0.0005 <0.0005 <0.0005 <0.0005 --- 10/20/10 <0.05 0.95 ---<0.05 <0.0005 <0.0005 <0.0005 <0.0005 --- 1/27/11 <0.05 0.79 ---0.057 37 <0.0005 <0.0005 <0.0005 <0.0005 --- 4/20/11 <0.05 0.77 ---0.072 36 <0.0005 <0.0005 <0.0005 <0.0005 --- 7/21/11 <0.05 0.78 ---0.098 37 <0.0005 <0.0005 <0.0005 <0.0005 --- 10/19/11 <0.05 0.95 ---0.11 42 <0.0005 <0.0005 <0.0005 <0.0005 ---1/20/12 <0.05 0.77 ---<0.05 <0.0005 <0.0005 <0.0005 <0.0005 Well Covered During Quarterly Monitoring Event Not sampled - well inaccessible Not sampled due to SPH I:\Tidewater\TW Stockton (P2A)\Tables\QMR Tables\2012\1Q12\20120305-Parcel2A (Tables 4,5,6,7) Historical GW Tables 1Q12-CL.xlsx Page 13 of 67