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SENDCA II~1 MINE <br />SI1PPLk14FI7PAL GDJPISSP1iCAL II~VFSZZCATION FC)R HAUL ROAD G <br />Peabody Coal Company submitted Technical Revision 16 for Seneca II-W to <br />Colorado Mined Iand Reclamation Division (CMLRD). This revision <br />requested approval to construct Pond 005 aril Haul Road G. The <br />geotechnical information submitted for the pond was considered by CMLRD <br />to be sufficient but information submitted for Haul Road G was lacking in <br />some respects. Although the pond was the main focus during the field <br />geotechnical investigations, information was also obtained to design and <br />construct a stable coal haulage road. The information contained in this <br />report is meant to supplement the information contained in the report <br />"Geotechnical Investigation Proposed Farthfill Dam for Pond 005" by Ground <br />F]igineering. This report also refers to a report written by John Ivey <br />entitled "Engineering Geological Ground Stability Investigations 005 Gulch <br />and Vicinity." Both reports have been submitted to CMLRD. <br />The following report will discuss the laboratory analysis conducted, the <br />relevance of these tests, in~lementation of proper construction <br />techniques and proposed options should failure occur. <br />FIE[D AND LABORA'IURY INVESTIGATIONS <br />In order to identify the stability of the foundation material for the <br />. Pond 005 embankment and subgrade material for Haul Road G, a series of 16 <br />exploratory bore holes were completed in the area. The focus of the <br />exploration project was to gain the most amount of information in a short <br />time frame. After the landform mapping was colleted, it was determined <br />that exploration holes in the section of the proposed alignment from 0+00 <br />to 39+00 was not warranted based on information gained during the mapping <br />exercise. Ekploration holes A through L were colleted in the Pond 005 <br />area and holes M through Q (except O) were completed in or near the <br />proposed alignment, generally from Station 39+00 to 54+00. <br />The report entitled Geotechnical Investigation Proposed Farthfill Dam for <br />Pond 005 contains detailed information on the field and laboratory tests <br />that were conducted >n the area. The investigations were not limited to <br />Pond 005 (as the title suggests), although the pond and embankment area <br />were given a higher priority due to possible failure if not properly <br />located. <br />This supplemental report focuses on the haul road alignment, both <br />existing and proposed investigations. The Ground Engineering Report <br />lists the tests conducted to date. Table 1S summarizes the more <br />important results of these tests. These results have been reiterated in <br />this report to show their relevance to estimated values used to predict <br />road stability. Comparisons to published values have been given to <br />show how values obtained from these test cong~are to those given in select <br />references. <br />1 <br />