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0 <br /> through the shallow aquifer material and completed in the <br /> regional aquifer of interest. In this way, data on the vertical <br /> quality and head differences at the most contaminated site will <br /> be developed. <br /> # Additional horizontal plume delineation will be provided by an <br /> i <br /> iterative series of borings constructed on a staged radial basis <br /> from monitor well #6 , to define contaminant migration both <br /> lateral to the regional flow and parallel to the regional flow <br /> system. Such wells will be completed solely in the upper aquifer <br /> 3 system, and will be constructed in such a way as to preclude the <br /> i possible vertical migration of contaminants into deeper aquifers . <br /> The new monitor well construction program will also address <br /> horizontal plume definition for potential contamination of ground <br /> water by previous storm pond water ' infi1tration. It is <br /> anticipated that the staged radial well placement program will <br /> lyield information which will help determine monitor well <br /> i locations for pond plume definition. <br /> l <br /> Information will also be developed on the fluid quality within <br /> the vadose zone attendant to the retort area seepage. Such <br /> linformation will be collected by means of a series of <br /> pressure/vacuum lysimeters emplaced at three bore holes adjacent <br /> to the retort pit area. At each bore hole , a pressure/ vacuum <br /> lysi meter will be installed at depths of 10 feet , 20 feet , and 40 <br /> i <br /> feet. As will he discussed in a latter section , such <br /> � <br /> 1 simeters will <br /> pressure/ vacuum Y provide information on the <br /> 14 <br />