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t <br /> 03/101`2005 15:-57 5306766005 STRATUS NO CALIF,, PAGE 06/10 <br /> Battelle It Suss and -Site.Bioremediation Symgositun,Junc 2.5,7-003 <br /> i <br /> situ and ex-situ remediation systezris. in-situ remediation systems iztclude F�iostirrtulation <br /> where oxygen or other electron acceptors are deliver d to the subsurface. The demand <br /> far these electron. acceptors is proportional to the cantaminan mass <br /> abe flux.scaledtothe F <br /> treatment, such as granular activated carbon (GAC} systems, <br /> treatment, <br /> sr►s predicted for the extraction well. With operating remediation systems, <br /> j mass flux estimates,aver multiplo�sampling events,may be used to confirm thein success <br /> or demonstrate limitations. If remedaatlon includes an oxygen delivery system,mass flux <br /> can be used to estimate the oxygen.demand exerted by the contaminants (O'Reilly et al., <br />` 2003). In Case Study 2 below, mass flux estimates are used in the performance <br /> evaluation of the remediation system. <br /> Case Study 2: The San Jose Terminal has been a demorlstration site for two oxygen <br /> delivery systems as potential bioremediation methods. The site groundwater velocity is <br /> based A borehole dilution tests. The configuration of the <br /> 0.1 ft/day (0,03 m1day), deliver <br /> monitoring and oxygen delivery wells is illustrated in Figure 3a. The oxygeny <br /> well transect 2 includes five wells containing the Iso-CrenT system and Gen wells <br /> containing the Waterloo I iffusivi Emitters (Wilson et al.,2002). The southern txansect_1 <br /> I consists of monitoring wells upgradient of the oxygen delivery well transect 2. The <br /> northern transect consists of rnonitc�ring wells dovmgradient of the oxygen delivery <br /> well:transect. The oxygen delivery systems began operation in October 2041. <br /> Groundwater Flow <br /> i Direction Well 0-16 <br /> Well Q-1A Transect 1 'Transect 2 <br /> Weil f'�-i / "'� ,�. <br /> V49O 4 0 <br /> b QQ O 0 0 0 0 p / D 000190600 5' <br /> O U O <br /> 0 70 0k Transect 3 : <br /> Well 0-38 4 4 inch Oxygen D eliverY Wells <br />' North <br /> * iso-Gen Wells(5) <br /> i <br />` 9 Waterloo M6 sive Emitter Wells <br /> j4 <br /> 0 2 Inch Monitoring Wells <br /> FIGUPX 3a.San,apse Tertninal—Monitoring and oxygen delivery wells <br /> j Mass flux estimates were made for individual monitoring wells across transect 3, <br /> because of the uniform well spacing and variability in contaminant concentrations across <br /> the 150 foot (45 In) stride pll'me. Figure 3b is a plot for TPHd (diesel) and TPH <br /> (gasoline) mass flux across transect 3 for October'2001 and September 2402. figure 3b <br /> illustrates a reduction in both TP114d and TPHg in the eastern portion of the transect. <br /> E <br /> 5 <br />