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3.0 LABORATORY TESTIPG <br />3.1 INTRODUCTION <br />- Tests were performed on soil samples to evaluate the geotechnical <br />properties and to determine the characteristics of the various <br />• materials. Laboratory tests were correlated with field <br />investigations and observations for providing appropriate <br />_ understanding of the subsurface conditions. This section <br />• discusses the details of the laboratory test procedures and <br />presents specific results. <br />3.2 ,~~ CONDITIONS <br />_ In order to accurately describe the subsurface soil conditions, <br />the soils in each test boring were grouped into soil types based <br />on visual observations. Testing of the soils in each test boring <br />was then performed and compared to determine similar materials in <br />. each boring. A total of 19. different soil types were noted when <br />each hole was classified separately. Of the 19 soil types, 11 <br />were tested to determine their grain size characteristics and <br />Atterberg Limits. The coal waste encountered in Test Borings No. <br />1 and No. 2 and the weathered claystone, sandstone, shale and <br />coal seams were not tested since these were not considered <br />critical to the slope stability or represented only a very small <br />percentage of the bench material. Based on the test results, <br />soils from each test boring were grouped into soil types. <br />Utilizing the results of the laboratory testing and grouping <br />similar soils, a total of 7 different soil types were determined <br />for the upper soil profile for the site. Some of the soil types <br />u <br />11 <br />