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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 MW-06A 3/03/95 9.57 11.70 25.56 1.39 Measurement of free product layer. MW-06A 3/16/95 9.00 10.40 16.80 0.91 Product removed by bailer. MW-06A 4/06/95 9.62 11.86 26.88 1.46 Product removed by bailer. Approximately 6 gallons of product have been removed since first installation of the skimmer in MW-06A 5/15/95 1992. Approximately 110 gallons of product/water have MW-06A 6/19/95 been removed since 15 May 1995. Approximately 0.5 gallon of product has been MW-06A 11/28/95 10.20 10.30 1.20 0.07 removed since reinstallation of pump. MW-06A 2/19/96 8.70 8.71 0.12 0.01 Power off.Call for repair. Measurement of product layer. Remove product MW-06A 5/10/96 9.23 9.25 0.24 0.01 skimmer.Install two bilge bags. MW-06A 5/13/96 9.48 9.49 0.12 0.01 Measure product layer. Reinstall two bilge bags. No measurable product. Calculated weight of diesel MW-06A 7/15/96 NA 9.80 sheen 0.000 removed was 0.35 lb. MW-06A 7/22/96 - - - - Replace bilge bags with one bilge bag. MW-06A 11/14/96 8.84 8.88 0.48 0.03 Measure product layer. Install a fresh bilge bag. MW-06A 2/11/97 NA 8.14 sheen 0.000 No measurable product;sheen only. MW-06A 2/20/97 - - - - Replace bilge bag- MW-06A 5/22/97 NA 7.91 sheen 0.000 No measurable product. Replace bilge bag. MW-06A 7/28/97 8.41 8.42 0.12 0.01 Measure product layer. Replace bilge bag. MW-06A 10/31/97 9.48 9.52 0.48 0.03 Measure product layer. Replace bilge bag. MW-06A 2/12/98 7.78 7.80 0.24 0.01 Measure product layer. Replace bilge bag. MW-06A 5/11/98 7.68 7.68 0.00 0.00 Meter barely read product. Replace bilge bag. MW-06A 7/27/98 8.25 8.26 0.12 0.01 Measure product layer. Replace bilge bag. MW-06A 12/01/98 9.27 9.30 0.36 0.02 Measure product layer. MW-06A 2/2/1999 8.84 8.93 1.08 0.06 Measure product layer. Replace bilge bag. MW-06A 5/11/1999 9.08 9.09 0.12 0.01 Measure product layer. Replace bilge bag. MW-06A 8/10/1999 NA 8.45 0.00 0.00 No measurable product Replace bilge bag. MW-06A 11/17/1999 10 10.29 3.48 0.19 Measure product layer. Replace bilge bag. MW-06A 2/7/2000 9.63 9.67 0.48 0.03 Measure product layer. Remove and replace bilge WE MW-06A 5/9/2000 7.01 7.9 10.68 0.58 Measure product layer. Remove and replace bilge bag MW-06A 8/8/2000 19.51 19.9 4.68 0.25 Measure product layer. Remove bilge bag. MW-06A 11/8/2000 10.43 NM 0.00 0.00 Install new bilge bag. MW-06A 2/12/2001 10.35 11.99 19.7 1.07 Measure product layer. Replace bilge bag. MW-06A 5/9/2001 9.58 11.03 17.4 0.95 MW-06A 8/13/2001 9.45 10.45 12.0 0.65 MW-06A 11/19/2001 10.42 12.38 23.5 1.28 MW-06A 3/5/2002 9.95 11.71 21.1 1.15 MW-06A 11/18/2002 10.49 10.82 4.0 0.22 MW-06A 3/24/2003 10.31 10.67 4.3 023 MW-06A 11/10/2003 10.60 10.86 3.12 0.17 MW-06A 1/5/2004 10.09 11.03 11.28 0.61 Removed socks on Dec 15 MW-06A 1/15/2004 10.20 11.00 9.60 0.52 Replaced socks MW-06A 3/22/2004 10.30 11.14 10.08 0.55 Removed socks on Feb 23 MW-06A 3/31/2004 10.22 11.09 10.44 0.57 Replaced socks MW-06A 7/26/2004 9.32 10.1 9.36 0.51 Replace sock MW-06A 7/29/2004 NM NM NM NM Replace sock MW-06A 8/16/2004 NM NM NM NM Sock fell in well MW-06A 8/23/2004 NM NM NM NM Sock still in well MW-06A 9/10/2004 10.60 11.25 7.80 0.42 Install sock MW-06A 9/29/2004 10.65 11.2 6.60 0.36 Replace sock MW-06A 10/14/2004 10.62 11.1 5.76 0.31 Remove sock for sampling MW-06A 11/1/2004 10.53 10.% 5.16 0.28 MW-06A 11/12/2004 10.35 10.95 7.20 0.39 Install sock MW-06A 12/3/2004 10.65 11.25 720 0.39 Replace sock MW-06A 12/13/2004 10.63 11.3 8.04 0.44 Replace sock MW-06A 1/4/2005 9.84 10.43 7.08 0.39 Replace sock MW-06A 1/19/2005 9.93 10.51 6.96 0.38 Replace sock MW-06A 2/1/2005 9.90 10.4 6.00 0.33 Replace sock MW-06A 2/16/2005 9.33 9.9 6.84 0.37 Remove sock for sampling ERM Page 1 of 16 UPRR/0020500.56-8/24/2006