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Table 1 <br /> Groundwater Elevations <br /> ' Union Pacific Railroad Company <br /> Former Maintenance Facility , Tracy, California <br /> 2011/2011 Annual Groundwater Monitoring Report <br /> Well Date Reference Elevation Depth to Water Water Elevation <br /> Identification (feet above MSL) (feet btc) (feet above MSL) <br /> TW-03 11/07/05 52.11 11.27 40.84 <br /> ' 03/07/06 52.11 11.09 41.02 <br /> 12/27/06 52.11 11.58 40.53 <br /> 03/20/07 52.11 11.56 40.55 <br /> ' 11/29/07 52.11 11.95 40.16 <br /> 03/18/08 52.11 11.25 40.86 <br /> 11/21/08 52.11 12.07 40.04 <br /> 03/16/09 52.11 11.79 40.32 <br /> ' 11/19/09 52.11 12.20 39.91 <br /> 03/15/10 52.11 11.00 41.11 <br /> 11/22/10 54.89 11.62 43.27 <br /> 03/16/11 54.89 11.73 43.16 <br /> TW-04 11/07/05 52.09 LPH NA <br /> 03/07/06 52.09 11.11 40.98 <br /> 12/27/06 52.09 11.47 40.62 <br /> ' 03/20/07 52.09 11.43 40.66 <br /> 11/29/07 52.09 LPH NA <br /> 03/18/08 52.09 LPH NA <br /> 11/21/08 52.09 LPH NA <br /> 03/16/09 52.09 LPH NA <br /> 11/19/09 52.09 LPH NA <br /> 03/15/10 52.09 LPH NA <br /> 11/22/00 54.76 LPH NA <br /> 03/16/11 54.76 LPH NA <br /> Notes and Key: <br /> Groundwater elevation measurements not collected after March 2006 in extraction wells and <br /> piezometers EWP-01 through EWP-16 because the groundwater extraction system <br /> (margin well system)remains shut down. <br /> Existing wells MW-03A, MW-03B,MW03G, Ml 7B, MW-18A, MW-18B, MW-19A, MW-20A, <br /> ' MW-21AR,and MW-21 B were approved for abandonment by the Regional Water Quality <br /> Control Board and are no longer included in the groundwater monitoring program. <br /> btc=Below top of casing <br /> LPH =Free product <br /> ' MSL=Mean sea level <br /> NM=Not measured because well inaccessible or not located <br /> NA=Data not available <br /> ' <br /> UP Tracy Annual Tables 1-5 2011.x1sx ARCADIS Page 17 of 17 <br />