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Table 1 Historical Product Measurement and Thickness Union Pacific Railroad Company Former Tracy Maintenance Facility Tracy,California Depth to Product Product Well Date Product Depth to Water Thickness Volume Identification Measured (feet btc) (feet btc) (inches) (gal) Comments TW-02 8/21/95 9.45 9.64 2.28 0.12 Measurement of free product layer. TW-02 8/31/95 9.80 10.09 3.48 0.19 Measurement of free product layer. TW-02 9/06/95 10.05 10.32 3.24 0.18 Install Nochar bilge bags. Measurement of free product approximately 2.5 TW-02 9/06/95 10.09 10.20 1.32 0.07 hours after the installation of Nochar bilge bags. TW-02 9/07/95 10.11 10.26 1.80 0.10 Remove and replace Nochar bilge bag. TW-02 9/30/95 NA 10.50 0.00 0.00 No measurable product. TW-02 10/30/95 NA 10.52 0.00 0.00 No measurable product. Nochar bilge bags removed. TW-02 11/28/95 10.61 10.88 3.24 0.18 Product removed by bailer. TW-02 12/27/95 9.78 10.10 3.84 0.21 Install Nochar bilge bags. TW-02 1/25/96 8.85 8.88 0.36 0.02 Bilge bag appears to be absorbing free product Measurement of free product layer. Bilge bags TW-02 2/19/96 9.22 9.28 0.72 0.04 appeared fairly full. Bilge bags weighed and Remove and replaced. TW-02 3/15/% - - - - Calculated weight of diesel removed was 1.25 lbs. Remove and replace bilge bags. Calculated weight of TW-02 5/13/% 9.87 9.89 0.24 0.01 diesel removed was 1.25 lbs. Measure product thickness. Calculated weight of TW-02 7/15/96 9.14 9.16 0.24 0.01 diesel removed was 0.50 Ib. TW-02 7/25/96 - - - - Remove and replace bilge bag. Measure product thickness. Remove and replace TW-02 11/14/96 9.31 9.64 3.% 0.22 bilge bags. TW-02 2/11/97 8.46 8.75 3.48 0.19 Measure product thickness. TW-02 2/20/97 - - - - Remove and replace bilge bag. TW-02 5/22/97 8.46 8.64 2.16 0.12 Measure product thickness. Remove and replace TW-02 7/28/97 8.89 8.97 0.96 0.05 Measure product layer. Remove and replace bilge TW-02 10/31/97 9.90 9.95 0.60 0.03 Measure product layer. Remove and replace bilge TW-02 2/05/98 7.87 8.24 4.44 0.24 Measure product layer. Remove and replace bilge TW-02 5/11/98 8.30 8.39 1.08 0.06 Measure product layer. Remove and replace bilge TW-02 7/27/98 8.68 8.74 0.72 0.04 Measure product layer. Remove and replace bilge TW-02 12/01/98 9.40 9.42 0.24 0.01 Measure product layer. Remove and replace bilge TW-02 2/2/1999 9.38 9.40 0.24 0.01 Measure product layer. Remove and replace bilge bag TW-02 5/11/1999 9.64 9.86 2.64 0.14 Measure product layer. Remove and replace bilge bag TW-02 8/10/1999 8.86 9.02 1.92 0.10 Measure product layer. Remove and replace bilge bag TW-02 11/17/1999 10.35 11.06 8.52 0.46 Measure product layer. Remove and replace bilge bag TW-02 2/7/2000 NA 10.08 0.00 0.00 No measurable product. TW-02 5/9/2000 6.83 7.25 5.04 0.27 Measure product layer. Remove and replace bilge bag TW-02 8/8/2000 10.02 10.35 3.% 0.22 Measure product layer. Remove bilge bag. TW-02 11/8/2000 10.91 NM 0.00 0.00 Measure product layer. Replace bilge bag. TW-02 2/12/2001 11.76 12.35 7.1 0.39 Replace sock TW-02 5/9/2001 10.13 10.74 7.3 0.40 Replace sock TW-02 8/13/2001 9.99 10.30 3.7 0.20 Replace sock TW-02 11/19/2001 11.13 11.68 6.6 0.36 Replace sock TW-02 3/5/2002 10.64 10.72 1.0 0.05 Replace sock TW-02 11/18/2002 11.02 11.08 0.7 0.04 Replace sock TW-02 3/24/2003 ND 10.87 0.0 0.00 Replace sock TW-02 11/10/2003 11.19 11.20 0.1 0.01 Replace sock TW-02 1/5/2004 10.61 11.50 10.7 0.58 Replace sock TW-02 1/15/2004 10.75 11.50 9.0 0.49 Replace sock TW-02 3/22/2004 10.85 11.12 3.2 0.18 Replace sock TW-02 3/31/2004 10.78 11.03 3.0 0.16 Replace sock TW-02 7/26/2004 ND 9.79 0.0 0.00 Replace sock TW-02 7/29/2004 NM NM NM NM Replace sock TW-02 8/16/2004 ND 10.40 0.0 0.00 Remove sock TW-02 8/23/2004 ND 10.68 0.0 0.00 TW-02 9/10/2004 ND 11.13 0.0 0.00 TW-02 9/29/2004 ND 11.15 0.0 0.00 TW-02 10/14/2004 ND 11.10 0.0 0.00 TW-02 11/1/2004 ND 11.02 0.0 0.00 TW-02 11/12/2004 ND 10.92 0.0 0.00 ERM Page 12 of 16 UPRR/0020500.56-8/24/2006