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Table 4 Groundwater Analytical Data-Total Petroleum Hydrocarbons,BTEX,MTBE,TBA,and As South Shore Parcels-Parcel 2A and Adjacent Areas West Weber Avenue and North Lincoln Street Stockton,California Depth Ethyl- Sample (feet, Date TPHg TPHd TPHo Benzene Toluene benzene Xylenes MTBE TBA As ID b s) Sampled (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) A Zone Wells-Area 2A/2B and Adjacent Areas(cont.) MW-18(cont.) --- 4/23/08 3.9 <1.5 <0.05 0.0012 0.00086 0.0012 0.00403 <0.0005 <0.005 --- --- 7/24/08 4.4 <1.5 y <0.05 0.0011 0.00078 0.0012 0.00419 <0.0005 <0.005 0.20 --- 10/22/08 4.1 <1.5 a <0.05 0.0010 0.00081 0.0012 0.00403 J <0.0005 <0.005 --- --- 1/22/09 3.8 <2.0 36p8 0.07512 0.00092 0.00074 0.0012 0.00331 <0.0005 <0.005 --- --- 4/23/09 4.0 <1.5 48 <0.05 0.00079 0.00061 0.0011 0.00353 <0.0005 <0.005 --- --- 7/30/09 3.9 1.20 <0.05 0.00057 0.00062 0.0009 0.00292 <0.0005 <0.005 0.30 --- 10/21/09 2.8 1.8 <0.05 0.00056 0.00057 0.00084 0.00261 <0.0005 <0.005 --- --- 1/20/10 3.8 1.9 <0.05 0.00071 0.00067 0.00089 0.0025 <0.0005 <0.005 0.28 --- 4/20/10 4.0 <2.048 <0.05 0.00058 0.00065 0.00094 0.00265 <0.0005 <0.005 --- --- 7/21/10 2.6 1.2 43 <0.05 <0.0005 <0.0005 0.00073 0.00233 <0.0005 <0.005 0.24 --- 10/20/10 3.8 1.5 <0.05 <0.0005 0.00054 0.00077 0.00226 <0.0005 <0.005 --- --- 1/27/11 4.0 1.2 <0.05 0.00052 <0.0005 0.00092 0.00252 <0.0005 <0.005 0.30 --- 4/21/11 3.6 1.4 <0.05 0.00055 0.00058 0.00088 0.00265 <0.0005 <0.005 --- --- 7/20/11 3.2 <1.548 <0.05 <0.0005 <0.0005 0.00072 0.00253 <0.0005 <0.005 0.20 --- 10/19/11 2.6 1.4 0.082 <0.0005 <0.0005 0.00064 0.0015 <0.0005 <0.005 --- --- 1/20/12 3.7 1.4 <0.05 <0.0005 <0.0005 0.00076 0.00219 <0.0005 <0.005 0.10 --- 4/18/12 3.9 1.3 43 <0.05 <0.0005 0.00056 0.00070 0.00228 <0.0005 <0.005 --- --- 7/18/12 2.7 <1.54d <0.05 <0.0005 <0.0005 <0.0005 0.00120 <0.0005 <0.005 0.12 --- 10/17/12 3.6 <1.048 <0.05 <0.0005 <0.0005 <0.0005 0.0013 <0.0005 <0.005 --- MW-19 --- 4/15/03 9.8 2.50 <0.05 2.0 0.042 0.03 0.091 <0.01 0.31 0.084 --- 5/8/03 14 4.40 0.224 3.2 0.051 0.067 0.097 <0.02 0.33 0.160 --- 8/21/03 15 2.50 0.08 3.5 0.06 0.19 0.11 <0.01 0.32 0.210 --- 11/13/03 16 5.40 0.2704 2.7 0.062 0.21 0.082 <0.005 0.40 0.203 --- 2/20/04 17 3.70 0.1916 3.4 0.079 0.35 0.116 <0.01 0.33 0.320 --- 6/3/04 12 4.30 0.254 2.9 0.046 0.14 0.061 <0.01 0.35 --- --- 9/9/04 17 2.20 0.07816 4.0 0.097 0.33 0.127 <0.01 0.27 0.250 --- 12/10/04 14 1.90 0.1104 3.1 0.076 0.24 0.101 <0.005 0.35 --- --- 2/25/05 15 1.60 <0.05 2.8 0.078 0.28 0.128 <0.005 0.30 0.200 --- 5/27/05 15 2.20 0.10016 3.2 0.033 <0.0025 0.064 <0.0025 0.27 --- --- 8/24/05 14 2.10 <0.05 2.9 0.087 0.28 0.137 <0.005 0.33 0.19 --- 11/16/05 14 <2.00 y <0.05 3.2 0.067 0.17 0.091 <0.0005 0.24 --- --- 2/16/06 13 <1.50 a <0.05 3.0 0.12016 0.31 0.176 <0.005 0.28 0.236 --- 5/15/06 Not sampled due to Sheen --- 8/16/06 15 1.9 0.0928 3.0 0.07 0.19 0.088 <0.007 0.28 0.15 --- 11/14/06 Not sampled due to Sheen --- 2/5/07 Not sampled due to Sheen --- 5/7/07 Not sampled due to Sheen --- 7/3/07 Not sampled due to Sheen --- 10/8/07 Not sampled-no access agreement --- 1/21/08 Not sampled due to Sheen --- 4/23/08 10 2.80 0.098 2.711 0.059 0.083 0.068 <0.005 0.24 --- --- 7/24/08 10 2.30 0.094 2.4 0.064 0.16 0.073 <0.005 0.26 0.29 --- 10/20/08 Not sampled due to Sheen --- 1/23/09 11 2.20 0.054 2.3 0.082 0.20 0.094 <0.005 0.20 0.045 --- 4/20/09 Not sampled due to Sheen --- 7/27/09 Not sampled due to Sheen --- 10/19/09 Not sampled due to Sheen --- 1/20/10 10 4.2 0.088 1.8 0.052 0.065 0.064 <0.0005 0.21 0.34 --- 4/19/10 Not sampled due to Sheen Stantec 20120924-Parcel2A(Tables 4,5,6,7)Historical GW Tables 4Q12.xlsx Page 12 of 61