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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 PZ-01 10/12/2005 10.00 10.10 1.20 0.02 Replace sock PZ-01 10/28/2005 10.05 10.06 0.12 0.0 Remove sock PZ-01 11/7/2005 10.21 10.29 0.96 0.01 PZ-01 11/30/2005 10.33 10.35 0.24 0.0 PZ-01 12/16/2005 10.5 10.51 0.12 0.0 Trace product PZ-01 12/29/2005 10.13 10.14 0.12 0.0 PZ-01 1/9/2006 9.86 9.91 0.60 0.01 Install sock PZ-01 1/31/2006 ND 10.29 0.0 0.0 Remove sock PZ-01 2/14/2006 ND 10.31 0.0 0.0 PZ-01 2/21/2006 ND 10.31 0.0 0.0 PZ-01 3/8/2006 ND 10.25 0.0 0.0 PZ-01 3/23/2006 ND 10.10 0.0 0.0 PZ-01 4/17/2006 9.81 9.95 1.68 0.02 Install sock PZ-01 4/27/2006 10.1 10.11 0.12 0.00 Remove sock PZ-01 5/10/2006 10.24 10.30 0.72 0.01 Install sock PZ-01 5/26/2006 ND 9.92 0.00 0.00 Remove sock PZ-01 6/13/2006 ND 8.81 0.00 0.00 PZ-02 12/19/94 9.85 10.70 10.20 0.14 Prior to PZ-2 well development. PZ-02 12/19/94 12.91 12.94 0.36 0.00 End of PZ-2 well development. PZ-02 12/22/94 8.95 10.55 19.20 0.26 Prior to purging MW-11A. End of purging MW-11A-350 gallons-38 well PZ-02 12/22/94 10.29 10.57 3.36 0.05 volumes. PZ-02 1/03/95 8.79 10.49 20.40 0.28 Prior to purging MW-11A. End of purging MW-11A-190 gallons-21 well PZ-02 1/03/95 10.01 10.47 5.52 0.08 volumes. Collect samples for density and viscosity PZ-02 1/25/95 NM NM NM NM measurements. PZ-02 1/31/95 8.95 10.52 18.84 0.26 Remove product from PZ-2. PZ-02 3/03/95 9.54 10.18 7.68 0.10 Measurement of free product layer. PZ-02 3/16/95 9.05 11.50 29.40 0.40 Product removed by bailer. PZ-02 4/06/95 9.25 10.90 19.80 0.27 Product removed by bailer. PZ-02 5/15/95 9.52 10.96 17.28 0.23 Product removed by bailer. PZ-02 6/26/95 8.80 9.10 3.60 0.05 Product removed by bailer. PZ-02 7/11/95 8.00 8.34 4.08 0.06 Product removed by bailer. PZ-02 7/25/95 8.22 8.60 4.56 0.06 Measurement of free product layer. PZ-02 9/06/95 9.46 10.32 10.32 0.14 Measurement of free product layer. PZ-02 9/30/95 9.78 10.73 11.40 0.16 Measurement of free product layer. PZ-02 10/31/95 9.85 10.68 9.96 0.14 Measurement of free product layer. PZ-02 11/28/95 9.93 11.02 13.08 0.18 Product removed by bailer. PZ-02 12/27/95 9.21 9.74 6.36 0.09 Install Nochar bilge bags. Bilge bags removed approximately 0.45 lb.of PZ-02 1/25/96 9.25 9.48 2.76 0.04 product. Remove and replace bilge bag. Product visible along entire length of bilge bag. PZ-02 2/19/96 8.64 8.76 1.44 0.02 Calculated weight of diesel removed was 1.00 lb. PZ-02 3/15/96 - - - - Bilge bags weighed and Remove and replaced. PZ-02 5/13/96 8.30 8.31 0.12 0.00 Measure product and Remove and replace bilge bag. Measure product. Calculated weight of diesel PZ-02 7/15/96 8.54 8.59 0.60 0.01 removed was 0.25 lb. PZ-02 7/25/96 - - - - Remove and replace bilge bag. PZ-02 11/14/96 8.82 8.95 1.56 0.02 Measure product. Remove and replace bilge bag. PZ-02 2/11/97 7.83 8.14 3.72 0.05 Measurement of free product layer. PZ-02 2/24/97 - - - - Remove and replace bilge bag. PZ-02 5/22/97 7.79 7.82 0.36 0.00 Measure product thickness. Remove and replace PZ-02 7/28/97 8.19 8.20 0.12 0.00 Measure product thickness. Remove and replace PZ-02 10/31/97 9.31 9.32 0.12 0.00 Measure product thickness. Remove and replace PZ-02 2/04/98 7.01 7.59 6.96 0.09 Measure product thickness. Remove and replace PZ-02 5/11/98 7.53 8.02 5.88 0.08 Measure product thickness. Remove and replace PZ-02 7/27/98 8.00 8.44 5.28 0.07 Measure product thickness. Remove and replace PZ-02 12/01/98 9.12 9.71 7.08 0.10 Measure product thickness. Remove and replace PZ-02 2/02/99 8.79 8.98 2.28 0.03 Measure product thickness. Remove and replace PZ-02 5/11/99 9.07 9.57 6.00 0.08 Measure product thickness. Remove and replace ERM Page 5 of 16 UPRR/0020500.56-8/24/2006