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TASK 2 - Geophysical Exploration <br /> Due to the presence 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 - <br /> 3 Seismicity Study <br /> The seismicity of the site and 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 find] landfill, embankment, and <br /> cut slopes, and to design stable leachate control and associated fea- <br /> tures. <br /> TASK 4:- Exploratory Drilling <br /> Six aory borings will be drilled to complement the six borings <br /> that have already been drilled at the site. Proposed approximate <br /> loca-tions are shown on Figure II-1. ' Three borings will be approximately <br /> i' 40 feet deep and three others will be approximately 135 to 160 feet . <br /> dee <br /> p p. The three deep borings will be converted to monitoring wells and <br /> two of the shallow borings will be converted to <br /> permeameters. Withthese borings we will 1 confirm <br /> ( ) the thickness of soil overlying bed- <br /> ' - rock, (2) describe encountered soils <br /> (using the Unified Soil Classifi- <br /> fl <br /> N cation System) and bedrock, (3) obtain representative soil , bedrock, and <br />:.y ground-water samples for testing, and (4) explore ground-water condi- <br /> tions. <br /> K <br /> L' J;•' <br /> PPA 8610-226 II-3 <br /> � r <br /> 4 Emcon Associates <br />