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Table 2 <br /> Groundwater Elevations ' <br /> Union Pacific Railroad Company <br /> Former Maintenance Facility , Tracy, California ' <br /> 2009/2010 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 /> 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 /> 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, MW03C, MW-17B, MW-IBA, MW-18B, MW-19A, MW-20A, <br /> MW-21 AR,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 /> 1 <br /> UP Tracy Annual Tables 2010_CC'd_AAV.xlsx ARCADIS Page 16 of 16 ' <br />