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LJ <br />2.0 DATA COLLECTION PROGRAM <br />BRL designed a comprehensive drilling program for the area in the immediate vicinity of <br />the mains corridor based on geology, surface access, project timing and economics. As <br />illustrated in figure 1, three geotechnical holes were drilled in the vicinity of the corridor <br />to characterize hydrogeologic and rock mass properties above the mains. Cores were <br />3.25 inches in diameter, exceeding the minimum diameter (NX core 2.125 in) <br />recommended by ISRM. <br />In the design of the field program, overburden lithology was examined at the neighboring <br />boreholes while observing geologic conditions on the surface and studying regional joint <br />characteristics. The three new geotechnical core holes were considered important in <br />characterizing both lithology and structure at the site. These cores represented the line <br />samples of the rock mass and were used to identify the location of discontinuities while <br />0 providing the opportunity to examine the condition of discontinuity contact surfaces. To <br />address joint pattern, available measurements at the surface was studied using both <br />extensive regional (Tifft 1995) and local joint surveys (Carroll 2003). <br />Two coreholes (TC -03 -02 and TC- 03 -03) were drilled directly above the projected <br />location of the mains to verify actual seam thicknesses while examining lithology and <br />structure. The third corehole was located to the north of the corridor providing a basis for <br />comparing the impact of mining (if any) on overburden hydrogeologic conditions. <br />Upon completion of drilling, BRL logged the cores under the supervision of MTI staff to <br />evaluate the lithology and structure. The boreholes were then used for groundwater <br />monitoring. Monitoring included intervals above the B Seam, within the B Seam and <br />below the B Seam in the Rollins sandstone (figure 2). Measurements of groundwater <br />pressure in these holes were used to calculate effective stress and evaluate overburden <br />stability (section 5). <br />is <br />Maleki Technologies, Inc. Page 6 <br />