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Long Hollow Reservoir <br />Feasibility Study <br />(Appendix G) included a comprehensive map of the site geology, which is shown on Exhibit <br />3.1.2. <br />The H-P report concluded: <br />• There are no indications of geologic conditions that will make the proposed dam and <br />reservoir technically infeasible. <br />• The proposed dam site and reservoir appear suitable for either an earth embankment or <br />roller compacted concrete (RCC) dam. <br />• Most of the construction material needed for an earth embankment or RCC dam appear to <br />be present near the proposed dam site. <br />• No source of satisfactory riprap appears to be present close to the project area. <br />• Additional geologic and geotechnical engineering studies, including subsurface <br />exploration and laboratory testing, are needed for design. <br />3.7 Geotechnicallnvestigation <br />Western Engineers, Inc. conducted subsurface exploration and limited laboratory testing at the <br />project site. The test borings and laboratory test results of the geotechnical investigation are <br />presented in Appendix H. Western Engineers prepared the following text describing the <br />subsurface conditions at the Long Hollow site: <br />The site subsurface conditions were examined by means of 12 test holes. The test holes were <br />drilled by means of an all-terrain drill rig (Canterra CT 212) capable of drilling using both augers <br />and rotary methods. Auger drilling was performed using a 6.625-inch O.D. by 3.25-inch I.D. <br />hollow stem auger. Coring was done with a 5-foot-long NX core barrel using wire line methods. <br />The core bit was a face discharge coarse diamond bit. The core barrel was fitted with a split <br />inner tube. The drill rig was equipped with an air compressor capable of producing 350 cubic <br />feet per minute at a maximum pressure of 250 pounds per square inch (psi). Drilling circulation <br />991-077.120 Wright Water Engineers, Inc. Page 22 <br />April 2005 <br />