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In summary, by placing the borings using the HNU screening <br /> instrument for guidance, the boundaries of the contamination <br /> presence were defined. <br /> Vertical Extent of Contamination <br /> Since samples were collected continuously as the boring <br /> advanced, the vertical extents of contamination with respect to <br /> the ground surface were, to some extent, established. B-4 (p) was <br /> extended to the greatest depth below the surface. This boring, <br /> and subsequent borings indicated that the contamination presence <br /> extended into the saturated zonew <br /> ( ater table) of the project <br /> site. <br /> Because of this indication, two wells were emplaced to <br /> } <br /> _ evaluate the condition of the groundwater at the project site. <br /> Since an old gas station exists upgradient, a well was placed in <br /> boring B-12 to evaluate the condition of the groundwater <br />+i <br /> sufficiently upgradient from the site's UST installation. The <br />{. Y laboratory analysis of the water samples from MW-2, the <br /> _. upgradient wells, indicated no contaminant presence. <br /> To then evaluate the effect of the plume on the groundwater, <br /> a monitoring well was installed in an otherwise "clean" boring at <br /> f � <br /> the downgradient edge of the plume. Water samples collected from <br /> L this well (MW-1) indicated contamination well in excess of the <br /> _ applicable regulatory limits. An additional water sample was <br /> collected from one of the open "hot" borings Ings prior to <br /> backfilling. This sample also indicated an elevated level of <br /> contamination in excess of the regulator limits. Additionally, <br /> itionally, <br /> this "hot" boring also indicated levels of contamination above <br /> Page 36 <br /> j L <br /> 73 <br />