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` TASK -2 - Geophysical Exploration <br /> Due to theresence <br /> P of shallow bedrock, a seismic refraction survey will <br /> be conducted at the site to determine the thickness of soils overlying <br /> hard sandstone. In addition, the survey will indicate the rippability <br /> of the underlying rocks. This data will provide an indication of the <br /> amount of soil available for landfill cover material and for retention <br /> structures, if required. <br /> TASK 3 - Seismicity Study <br /> The seismicity ofthe site an <br /> _ d vicinity will be evaluated to determine <br /> the Maximum Probable Earthquake and its expected peak ground accelera- <br /> tion. The study will consider regional as well as local seismic condi- <br /> tions. The information developed in this study is to be used to perform <br /> stability analyses of intermediate and final landfill, embankment, and <br /> cut slopes, and to design stable leachate control and associated fea- <br /> tures. <br /> TASK 4Loolratory Drilling \\ j <br /> Six ary borings will be drilled to complement the six borings <br /> that have already been drilled at the site. Proposed approximate loca- <br /> tions are shown on Figure II-1. Three borings will be approximately <br /> 40 feet deep and three others will be approximately 135 to 160 feet <br /> deep. The three deep borings will be converted to monitoring wells and <br /> ." two of the shallow borings will be converted to permeameters. With <br /> += these borings we will (1) confirm the thickness of soil overlying bed- <br /> A':t <br /> .`' rock, (2) describe encountered soils (using the Unified Soil Classifi- <br /> cation System) and bedrock, (3) obtain representative soil , bedrock, and <br /> ground-water samples for testing, and (4) explore ground-water condi- <br /> r <br />. � tions. <br /> 4 <br /> a g�yy 4 <br /> PRA 8610-22D II-3 <br />� k <br /> mon Associates <br />