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Table 1 Historical Product Measurement and Thickness <br /> Union Pacific Railroad Company <br /> Former Tracy Maintenance Facility <br /> Tracy,California <br /> Depth to Product Product <br /> Well Date Product Depth to Water Thickness Volume <br /> Identification Measured (feet btc) (feet btc) (inches) (gal) Comments <br /> TW-04 6/22/2005 10.30 10.40 1.20 0.07 Install sock <br /> TW-04 7/8/2005 ND 10.26 0.0 0.0 Remove sock <br /> TW-04 7/21/2005 ND 10.43 0.0 0.0 <br /> TW-04 8/1/2005 ND 10.00 0.0 0.0 <br /> TW-04 8/11/2005 ND 10.18 0.0 0.0 <br /> TW-04 9/9/2005 ND 10.60 0.0 0.0 <br /> TW-04 9/26/2005 ND 10.87 0.0 0.0 <br /> TW-04 10/12/2005 ND 10.96 0.0 0.0 Sheen <br /> TW-04 10/28/2005 11.09 11.10 0.12 0.01 <br /> TW-04 11/7/2005 11.19 11.22 0.36 0.02 Not sampled,product in well <br /> TW-04 11/30/2005 ND 11.26 0.0 0.0 Note:dirt in well causing false product reading <br /> TW-04 12/16/2005 ND 11.44 0.0 0.0 <br /> TW-04 12/29/2005 ND 11.02 0.0 0.0 <br /> TW-04 1/9/2006 10.74 10.77 0.36 0.02 Install socks <br /> TW-04 1/31/2006 ND 11.02 0.0 0.0 Remove socks <br /> TW-04 2/14/2006 ND 11.21 0.0 0.0 <br /> TW-04 2/21/2006 ND 11.22 0.0 0.0 <br /> TW-04 3/8/2006 ND 11.11 0.0 0.0 <br /> TW-04 3/23/2006 ND 10.% 0.0 0.0 <br /> TW-04 4/17/2006 10.69 10.70 0.12 0.01 Trace product <br /> TW-04 4/27/2006 10.91 10.92 0.12 0.01 Trace product <br /> TW-04 5/10/2006 11.07 11.08 0.12 0.01 Trace product <br /> TW-04 5/26/2006 ND 10.80 0.00 0.00 <br /> TW-04 6/13/2006 9.75 9.76 0.12 0.01 Trace product <br /> Key: <br /> btc=Below top of casing <br /> gal=Gallons <br /> ND=Not detected <br /> NM=Not measured <br /> ERM Page 16 of 16 UPRR/0020500.56-8/24/2006 <br />