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<br />Proposal - Enginec.g Geologic Feasibility StUdY,". <br />Proposed COffintop Dam and Reservoir Site <br />June 8, 1981 <br /> <br />Page 6 <br /> <br />undisturbed or relatively undisturbed bedrock units. The purpose for <br />conducting these surveys is to obtain information on the orientation, <br />continuity, spacing and nature of structural features of the rock mass. <br />This information is critical for efficient planning of drilling <br />operations and is needed for correlation with subsurface data. <br /> <br />Core Drillinq, loqqinq, and Packer Testinq <br />To confirm the essential amount of geological detail which will <br />be provided by the surficial examination of the dam site (Exhibit B), 3 <br />or 4 exploratory bore holes (to provide NXsize core) will be drilled at <br />locations to be determined along the axis of the proposed dam. Each hole <br />, is planned to be drilled to a target depth of 200 feet. The recovered NX <br />core will be logged and photographed by a professional geologist and <br />intervals for packer testing will be selected to obtain preliminary <br />information on rock mass permeability. A total of five packer tests are <br />'planned to be conducted io each drill hole. After completion of <br />drilling, core logging, and packer testing, all exploratory holes will be <br />capped so that they can be reused for further investigation. The <br />position of the holes will be surveyed so that their lo~ation can be <br />identified on the appropriate maps. <br /> <br />Analysis of Field Data <br />Fracture-joint survey data will be analysed, tabulated and <br />presented as illustrated in Exhibits C-1 and C-2. <br /> <br />A detailed, site-specific, stratigraphic column for the dam- <br />reservoir Study Area will be prepared. Such columns, so far as <br />ascertainable from the results of these surficial and preliminary <br />subsurface investigations and the' study of existing litt:!rature, shall <br />show lithology and thicknesses of bedrock units as may be measurable or <br />mappable in the Study Area. Further subsurface exploration of the Study <br />Area as may be recommended and accompliShed later, pending the completion <br />of this study, may give caUse for modification of these preliminary <br />stratigraphic columns. <br /> <br />Packer tests will be analyzed to obtain preliminary values of <br />rock mass permeability. These will be average values of horizontal and <br />vertical permeability. <br /> <br />UEBLACKER ASSOCIATES. INC, <br />