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ARCAD(S Ms. Amy Terrell <br /> January 29, 2014 <br /> At a minimum, at least 260 physical LNAPL bailing events would be needed to <br /> remove an equal quantity of LNAPL over a period greater than 10 years compared to <br /> the NSZD annual attenuation rate. <br /> Based on these conservative results, it is recommended that physical LNAPL bailing <br /> from the site monitoring wells be discontinued and NSZD be approved to address the <br /> remaining LNAPL in the site subsurface. <br /> Closing <br /> If you have any questions or comments regarding the contents of this letter please <br /> contact Scott Hackman at 916.786.7369 or at scott.hackman@arcadis-us.com. <br /> Sincerely, <br /> ARCADIS U.S., Inc. <br /> Scott Hackman <br /> Project Manager <br /> !q ce'�.0-� <br /> Steve Gaito <br /> Senior Environmental Engineer <br /> James Eisert, PG (No. 7000), CHG (No. 779) <br /> Principal Hydrogeologist <br /> Senior Project Manager <br /> Copies: <br /> James E. Diel, Union Pacific Railroad Company <br /> Nuel Henderson, San Joaquin County Environmental Health Department <br /> Page: <br /> G:\Projects\UPRR_Roseville\RC000709_Tracy Mnt FacilityQ_DELIVERABLES\2014.01 NSZD Rpffmcy ca-Maint Facilfty_NSZD Rpt(01-29-14).doc 8/9 <br />