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4.0 AOC WORK PLANS <br /> This section presents a detailed workplan for each of the 11 AOCs. The in formation for each site <br /> consists of(1)a site summary presenting the background information for fl ie site,(2)the proposed <br /> activities and the rationale for the activities(if warranted), and(3) a plate s itowing the locations of <br /> the proposed activities(where warranted). <br /> 4.1 Area of Concerns Recommended For No Ft rther <br /> Investigation <br /> As discussed above, several investigative events have been performed at the Site to assess whether <br /> releases have occurred or to evaluate the extent of releases in the aforemer.tioned AOCs. Several <br /> of the investigation events also included soil removal activities and source removal. On the basis <br /> of these investigative events,previous review of regulatory files,and prior discussions with <br /> AMMC and regulatory personnel (which are discussed in further detail below in each AOC <br /> Workplan),it is our opinion that the following AOCs do not require additional investigation: <br /> • Pentachlorophenol Areas <br /> • Underground Storage Tanks <br /> • Septic Tanks <br /> • Polychlorinated Biphenyl Containing Transformers <br /> A discussion of prior investigation actives and the rational for no further i ivestigation follows in <br /> the sections below. <br /> 4.1.1 Pentachlorophenol Areas <br /> Site Summary <br /> Draft <br /> KB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. 12 <br /> September 28,2005 <br />