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Workplan for Supplemental Investigation <br /> 2005 Navy Drive, Stockton, CA <br /> January 2, 2013 <br /> Page 6 of 12 <br /> Cl CI <br /> ' C=C PCE <br /> CI CI <br /> H CI <br /> C=C ` TCE <br /> Cl CI <br /> H H H CI <br /> C=C ~ C=C <br /> CI CI Cl H <br /> cis DCE trans DCE <br /> H H <br /> C=C Vinyl <br /> CI �H chloride <br /> H H <br /> C=C Ethene <br /> H H <br /> The process of breakdown or degradation of PCE to TCE is a very slow process (on <br /> the order of decades). Also, the time it takes for the virtually complete breakdown of <br /> TCE to DCE is equally long. Furthermore, shallow groundwater in the site vicinity <br /> travels very slowly. Thus, at this site it appears likely that the presence of DCE in the <br /> absence of TCE represents an old release from an offsite location. <br /> If one assumed that the CVOCs came from an onsite release, then one would <br /> expect to find other contaminants such as gasoline or diesel constituents but none of <br /> these have been reported in the data collected to date. Furthermore, one would <br /> Risk-Based Decisions, Inc. <br />