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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.) 2AMW-13 --- 10/14/99 130 11.00 0.59 15 27 3.2 16 <1.0 --- --- --- 5/20/02 140 26(11) <0.3(<0.6) 13 23 2.6 13.4 <0.83 --- 0.17 (FD) --- 5/20/02 140 33(13) <0.3(<0.6) 15 27 2.8 13 <0.83 --- 0.17 --- 9/30/02 190 41(30) <0.5(<0.1) 20 32 4.4 20.5 <0.1 <1.0 0.19 --- 12/5/02 97 12(7.8) <0.1(<0.1) 10 17 2.2 11 <0.1 <1.0 0.152 --- 3/5/03 170 <11 0.15° 19 29 3.5 16.7 <0.010 0.85 0.243 --- 5/8/03 170 15.00 0.694 19 31 3.5 12.47 <0.1 <1 0.240 --- 8/21/03 190 12.00 0.214 20 28 3.7 19.3 <0.1 <1 0.230 --- 11/14/03 170 26.00 0.914 18 31 3.6 16.8 <0.1 <1 0.206 --- 2/20/04 130 28.00 1.21fi 14 21 2.6 12.2 <0.050 0.68 0.260 --- 6/3/04 140 2814 1.4 4,14 13 24 2.2 12.4 <0.050 0.7 --- --- 9/9/04 150 14.00 0.44 4 17 28 3.3 13.9 <0.10 <1.0 0.170 --- 12/10/04 210 9.00 0.334 14 26 4.5 21.3 <0.05 0.55 --- --- 2/25/05 99 12.00 0.49 4 9.3 15 1.8 8.9 <0.05 0.58 0.160 --- 5/26/05 150 12.00 0.30014 16 25 2.5 13.8 <0.05 0.710 --- --- 8/24/05 140 8.80 0.1324 14 23 2.4 12.4 <0.05 0.540 0.180 --- 11/16/05 140 <12.00 y 0.7114 15 22 3.0 14.2 <0.05 0.590 --- --- 2/16/06 130 <8.00 y 0.076'6 13 22 3.0 14.1 <0.04 0.470 0.221 --- 5/15/06 Not sampled due to Sheen --- 8/16/06 160 <12' 0.2628 16 20 3.3 14.3 <0.04 0.4 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 --- 10/10/07 110 18 0.26 28 13 15 2.6 12.3 <0.03 0.540 --- --- 1/21/08 Not sampled due to Sheen --- 4/21/08 Not sampled due to Sheen --- 7/21/08 Not sampled due to Sheen --- 10/20/08 Not sampled due to Sheen --- 1/19/09 Not sampled due to Sheen --- 4/20/09 Not sampled due to Sheen --- 7/27/09 Not sampled due to Sheen --- 10/19/09 Not sampled due to Sheen --- 1/18/10 Not sampled due to Sheen --- 4/19/10 Not sampled due to Sheen --- 7/19/10 Not sampled due to Sheen --- 10/18/10 Not sampled due to Sheen --- 1/24/11 Not sampled due to Sheen --- 4/18/11 Not sampled due to Sheen --- 7/18/11 Not sampled due to Sheen --- 10/17/11 Not sampled due to Sheen --- 1/17/12 Not sampled due to Sheen --- 4/16/12 Not sampled due to Sheen --- 7/16/12 Not sampled due to Sheen --- 10/15/12 Not sampled due to Sheen Stantec 20120924-Parcel2A(Tables 4,5,6,7)Historical GW Tables 4Q12.xlsx Page 9 of 61