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for the conflicting results is that the hits for diesel found in the first set of analyses may have <br /> been due to flushing of low-level soil contamination from within the inner drill pipe All <br /> laboratory analyses and the chain-of-custody sheets are included in Appendix A The results of <br /> Ithe secondary sampling are presented in Table 3 <br /> I This report has used the well designations BH-1, BH-2 and BH-5 to describe the newly <br /> installed wells For all future reports RMC will refer to the new wells as MW-4, MW-5 and <br /> MW-6 to sequentially follow the designations given to the three monitoring wells that surround <br /> the aggregate plant's permitted landfill The designation change is reflected in Figure 3 of this <br /> report <br /> CONCLUSIONS <br /> The most recent analytical results of groundwater samples appear to indicate that diesel <br /> hydrocarbon contamination has percolated through a portion of the soil column but it has not <br /> impacted the groundwater table as originally thought Based on this information RMC Pacific <br /> I Materials suggests setting up a monitoring program and taking additional groundwater samples <br /> from each of the wells To facilitate this task, RMC is planning to install dedicated pumps in the <br /> three wells this year <br /> RMC proposes to remove and remediate the contaminated soil intercepted by the upper <br /> portion of BH-1 (MW-4) This action may not be immediately viable, however, due to the <br /> contaminated soil location being nested within a section of the aggregate base rock processing <br /> plant that was installed in mid-2002 We suggest that the contaminated soil be removed during <br /> the final active period of the plant's life,dust prior to the facility closing down permanently <br /> I <br />