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Typically, groundwater contamination at the encountered depth is caused by shallower soil contamination <br /> that moves downward In regards to the potential source areas for the Block 4 groundwater plume, soil <br /> contamination and a previously unknown underground storage tank were discovered at the property <br /> located at 730 E Channel Street The two plumes in Blocks 5 and 6 have not been correlated to a <br /> particular soil source area and additional exploration will be required to identify the associated soil <br /> contamination It is likely that these two plumes may have originated from penetrations in the concrete <br /> slabs, from releases along foundations and footings on the exteriors of buildings, or from leaking pipes <br /> and drains that are part of the sanitary sewer system Additional work is needed to investigate the soil <br /> sources of contaminants that have impacted groundwater In general, however, the properties with the <br /> highest source potential are along the south side of Block 5 on the north side of E Weber Avenue, <br /> specifically 805, 811, 815, 829, and 843 E Weber Avenue At BIock 6, high concentrations of soil <br /> contamination were noted at the property at 931 E Weber Avenue This soil contamination, although high <br /> in concentration, did not appear to extend to groundwater and is likely a small area of contaminants) <br /> LIMITATIONS TO EXECUTIVE SUMMARY <br /> This executive summary should only be read as a brief summary, and not as a complete discussion of the full <br /> report text The scope of work and limitations should be understood prior to reading the site-specific <br /> information, results, and discussion Any construction and redevelopment activities should be coupled with <br /> ongoing field environmental monitoring <br /> CONDOR <br />