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Lorennra Canvon Minr -Geology Techtica( ReOOn <br />• <br />gamma ray, caliper, micro-resistivity and density suites. Copies of the lithologic logs and elecvic <br />logs are included in Appendix G-1. <br />Boreholes BH-1 and BH-2 were located in the area of the proposed surface mine. These boreholes <br />were continuously cored to obtain stratigraphic, structural and geochemical data for the P3 surface <br />mine. Other boreholes advanced across the site since the beginning of 1996 were located in <br />upgradient and downgradient locations of proposed mining activities and used to monitor potential <br />affects to groundwater. Alluvial wells were located in side canyons and above and below <br />proposed disturbance areas. <br />Boreholes were surveyed using 16 panel locations established as ground control for <br />photograrnmetric mapping. GPS technology was used in the performance of the survey. <br />Elevations are based upon NGS benchmazk J 67, NGS Purgatoire, USGS benchmark LS 57, and <br />USGS benchmark LS 54. Elevations have been reported in NGVD 1929 datum to agree with <br />existing USGS quadrangle topographic mapping. Survey data was used to determine the dip of <br />the stratum. Survey data is included in Table G-1. <br />Physical/Geochemical Properties of Stratum <br />The physical properties of each stratigraphic unit within the overburden and interburden were <br />• determined by a laboratory utilizing the appropriate ASTM standard for texture analyses. Overall <br />swell factors of 25 percent aze projected based on field observation of similar mining practices in <br />eastern Kentucky. The use of cast blasting and dozers for earth moving operations yields little <br />compaction. Densities and slake durability indices from BH-1 and BH-2 were correlated with data <br />from active jobs in Kentucky. <br />Rock or core samples were obtained and chemical analysis conducted on each stratum immediately <br />above and below the coal seam to be mined in addition to the coal seam. Samples from boreholes <br />were obtained at lithologic changes and of each coal seam encountered. Prior to analysis, samples <br />were ground to 200 mesh. The samples were analyzed for parameters listed in Table G-2. <br />Methodologies for the tested parameters are also included in Table G-2. <br />SECTION 3 -RESULTS AND DISCUSSION <br />Determination of Stratigraphy <br />Four past exploration activities have been conducted at the site prior to the 1996 work. <br />Exploratory drilling was conducted by John T. Boyd from 1974 to 1978. A total of 79 boreholes <br />were drilled across the site. Map 2.04.6-1 lists the locations of the boreholes. DH designates the <br />boreholes conducted during this period. Lithologic logs and electric logs are not available for all <br />boreholes. Available electric logs and lithologic logs are included in Appendix G-1. <br />• <br />Gcology~75/April 21, 1997 2 (revised 4/24/97) <br />