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90189H-APH CON-4 <br /> consultant in 1987, along with a draft feasibility study of possible <br /> remedial actions. These formed the basis for a draft Remedial Action Plan <br /> for the site that was released in July 1988. The draft Remedial Action <br /> Plan is available for review at the information repositories listed in <br /> Section 5. It summarizes the results of the remedial investigations and <br /> the feasibility study, and sets forth a plan for clean-up of soils and <br /> groundwater at the site. <br /> Contamination was detected in concrete flooring and sidewalks in parts <br /> of the facility, and in soil underneath the contaminated concrete. The <br /> predominant soil and concrete contaminant is copper; secondary contaminants <br /> are lead, nickel , and tin. Characterization of groundwater is ongoing at <br /> the site. Sampling results from 1986 showed groundwater under the site to <br /> contain elevated levels of copper and lead, with nickel and tin in lesser <br /> concentrations. Results from 1988 do not show elevated levels of metals in <br /> the groundwater. Groundwater monitoring will continue for at least one <br /> more year to determine whether or not elevated levels of metals are <br /> present. <br /> At present all contaminants appear to be contained within the former <br /> facility boundaries, except for shallow soil contamination along the <br /> western boundary that extends approximately 25 feet westward onto the <br /> adjacent property. Contaminants in groundwater, when detected, were <br /> confined to monitoring wells near th.e center of the property. No <br /> contaminants have been detected in perimeter wells or offsite wells. Based <br /> on investigations conducted through mid-1988, there appears to be very <br /> little current threat to public health from direct exposure to contaminated <br /> concrete or soil , and no evidence that contaminated groundwater is reaching <br /> wells that are used for drinking water. <br /> A draft Remedial Action Plan for cleaning up contaminated concrete, <br /> soils and groundwater has been prepared. Following public comment, the <br /> plan will be revised as necessary and finalized. The public comment period <br /> H-5 <br />