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Geosyntec <br /> consultants <br /> During the most recent sampling events conducted in 2015 and 2016, tetrachloroethene <br /> (PCE)was only detected above the MCL at two wells(Site 4), and trichloroethene(TCE) <br /> was only detected above the MCL at three wells(Site 4, Site 39,and IAS-11).The highest <br /> concentrations of TCE and PCE at RRI were detected at monitoring well W-020 located <br /> at Site 4 (Figure 2). <br /> In addition to chlorinated solvents, benzene was used as a proxy for evaluating petroleum <br /> hydrocarbon impacts to groundwater. During the most recent sampling events conducted <br /> in 2015 and 2016, benzene was only detected at seven wells at RRI, five of which were <br /> located at Site 5D in the central area. <br /> RRI Groundwater Monitoring Work Plan 6 1 June 2018 <br />