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TABLE 1 Page 1 of 4 GROUNDWATER DATA FORMER SHELL CENTRAL VALLEY CRUDE OIL PIPELINES CORDES RANCH TRACY,CALIFORNIA Ground Depth to Depth to Depth m&p- o- Xylenes Well ID Sample Date TOC Surface Water Water GW Elev to SPH Thickness TPHc TPHd Benzene Toluene Ethylbenzene Xylenes Xylene (total) TDS ft MSL ft MSL ft TOC ftbgs ft MSL feet feet ugIL ug/L ug/L ug/L 1191L ug/L ug/L ug/L mg/L, MW-1 8/23/2010 127.28 124.56 40.35 37.63 86.93 - - <250 <50 <0.50 <1.0 <1.0 <1.0 <1.0 - - MW-1 12/8/2010 127.28 124.56 40.45 37.73 86.83 - - <250 <50 <0.50 <1.0 <1.0 - - <1.0 1,530 MW-1 6/27/11 127.28 124.56 40.96 38.24 86.32 - - <240 <48 b <0.50 <0.50 <0.50 - <1.0 - MW-1 9/8/11 127.28 124.56 40.02 37.30 87.26 - - <480 <95b <0.50 <0.50 <0.50 - - <1.0 - MW-1 11/30/11 127.28 124.56 39.18 36.46 88.10 - - NA <47.6 b <0.50 <0.50 <0.50 - - <0.50 - MW-2 8/23/2010 123.60 121.29 36.21 33.90 87.39 - - 23,000 13,000 89 <1.0 1.4 <1.0 <1.0 - - MW-2 12/8/2010 123.60 121.29 36.03 33.72 87.57 - - 11,000 6,800 190 <1.0 2.6 - - <1.0 1,550 MW-2 6/27/11 123.60 121.29 37.10 34.79 86.52 37.08 0.02 - - - - - - - MW-2 9/8/11 123.60 121.29 35.98 33.67 87.62 - - 8,400 3,500 b 290 <2.0 3.0 - - <4.0 MW-2 11/30/11 123.60 121.29 35.70 33.39 87.90 - NA 13700 b 377 <0.50 5.15 - - <0.50 MW-3 8/23/2010 123.70 121.07 36.38 33.75 87.32 - <250 <50 <0.50 <1.0 <1.0 <1.0 <1.0 - - MW-3 12/8/2010 123.70 121.07 36.10 33.47 87.60 - <250 <50 <0.50 <1.0 <1.0 - - <1.0 1,290 MW-3 6/27/11 123.70 121.07 37.34 34.71 86.36 - - <240 540 b <0.50 <0.50 <0.50 - - <1.0 - MW-3 9/8/11 123.70 121.07 36.36 33.73 87.34 - - <480 <95 b <0.50 <0.50 <0.50 - - <1.0 MW-3 11/30/11 123.70 121.07 35.85 33.22 87.85 - - NA <47.6 b <0.50 <0.50 <0.50 - - <0.50 MW-4 8/23/2010 123.41 120.78 36.00 33.37 87.41 - - <250 77 <0.50 <1.0 <1.0 <1.0 <1.0 - - MW-4 12/8/2010 123.41 120.78 35.86 33.23 87.55 - - <250 <50 <0.50 <1.0 <1.0 - - <1.0 1,200 MW-4 6/27/11 123.41 120.78 37.02 34.39 86.39 - - 450 57 a,b <0.50 <0.50 <0.50 - - <1.0 - MW-4 9/8/11 123.41 120.78 36.02 33.39 87.39 - - <480 <96 b <0.50 <0.50 <0.50 - - <1.0 MW-4 11/30/11 123.41 120.78 35.50 32.87 87.91 - - NA <48.1 b <0.50 <0.50 <0.50 - - <0.50 - MW-5A 8/23/2010 123.34 120.89 35.90 33.45 87.44 - - 24,000 13,000 370 <1.0 1.7 <1.0 <1.0 - - MW-5A 9/16/2010 123.34 120.89 35.45 33.00 87.89 - - 15,000 9,100 380 <2.0 <2.0 <2.0 <2.0 - 1,260 MW-5A 12/9/2010 123.34 120.89 35.60 33.15 87.74 - - 6,400 3,700 400 <2.0 <2.0 - - <2.0 1,250 MW-5A 6/27/11 123.34 120.89 37.09 34.64 86.43 36.87 0.22 - - - - - - - MW-5A 9/8/11 123.34 120.89 35.79 33.34 87.61 35.71 0.08 - - - - - - - MW-5A 11/30/11 123.34 120.89 35.43 3298 87.94 35.39 0.04 - - - - - - - MW-5B 9/16/2010 123.44 120.92 35.68 33.16 87.76 - - 730 440 <0.50 <1.0 <1.0 <1.0 <1.0 - 2,180 <250 160 <0.50 <1.0 <1.0 <1.0 2,940 MW-5B 12/10/2010 123.44 120.92 35.83 33.31 87.61 - - - - MW-5B 6/27/11 123.44 120.92 37.32 34.80 86.12 - - 470 a <48 b <0.50 <0.50 <0.50 - - <1.0 - CRA060223(16)