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Table 2 <br /> Natural Source Zone Depletion Rates <br /> Union Pacific Railroad Company <br /> Tracy, CA- Maintenance Facility <br /> Natural Souce Zone Depletion Rates <br /> Location Relative to First Event(1Q13) Second Event(4Q13) <br /> Location ID LNAPL Footprint , Background Background <br /> Laboratory Results 2 Laboratory Results J <br /> Corrected Corrected <br /> gat/ac/yr gal/ac/yr <br /> Trap-01 Within Footprint 1,582 1,412 2,312 1,855 <br /> Trap-02 Within Footprint 769 599 3,122 2,665 <br /> Trap-03 Background 177 --- 162 --- <br /> Trap-04 Background 164 --- 752 --- <br /> Corrected NSZD Rates (per acre) 1,176 1,005 2,717 2,260 <br /> Corrected Average NSZD Rates (per acre) 1,633 <br /> gal/0.75 ac/yr gal/0.75 ac/yr <br /> Average NSZD Rates (LNAPL Footprint) --- 754 --- 1,695 <br /> Average LNAPL Depletion within Footprint during 2013 1,224 <br /> Notes: <br /> gal/acre/yr: Gallons per acre per year(as reported by E-Flux, LLC) <br /> 14C Corrected = NSZD rate as calculated by E-Flux, LLC, based on carbon dioxide flux and radioisotope analysis <br /> Background Corrected = Background NSZD rates are subtracted from reported rates <br /> --- = Background samples, so assume NSZD rate= 0. <br /> 1 = 14C correction conducted by the laboratory by removing the COI containing 14C from the CO2 not containing 14C and likely due to LNAPL degradation. <br /> 2 = Background correction conducted by subtracting the approximate average background CO2 result(170)from each"within footprint"result. <br /> 3= Background correction conducted by subtracting the approximate average background CO2 result(457)from each "within footprint'result. <br /> Tracy,ca-NSZD tbls-012914.xls ARCADIS Page 1 of 1 <br />