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<br />UUlI:.);) <br /> <br />Long Hollow Dam and Reservoir Summary Report-Preliminary Draft <br /> <br />feasibility study, such as the geologic reconnaissance study, the wetland delineation, the cultural <br />resources evaluation, and production of a reconnaissance level opinion of cost (+/-50 percent). <br /> <br />4.0 GEOLOGIC RECONNAISSANCE <br /> <br />LPWCD contracted with Hepworth-Pawlak Geotechnical, Inc. (H-P) to perform a feasibility <br />level, engineering/geology evaluation of the LHR site and geologic conditions that could have a <br />major impact on project feasibility and which would provide a basis for future design level <br />studies. After visiting the LHR site in January 2003, H-P prepared a report based on field <br />observations, interpretation of aerial photographs, and H-P's experience with similar projects <br />which concluded that: <br /> <br />· There were no indications of geologic conditions that would make the proposed dam and <br />reservoir technically infeasible. <br /> <br />· The proposed dam site and reservoir appear suitable for either an earth embankment or <br />roller compacted concrete (RCC) dam. <br /> <br />· Most of the construction material needed for an earth embankment or RCC dam appear to <br />be present near the proposed dam site. No source of rip-rap apvears to be vresent close to <br />the proiect area. <br /> <br />· Additional geologic and geotechnical engmeenng studies, that include subsurface <br />exploration and laboratory testing", In Phase II. we will be needed to develop appropriate <br />design recommendations for the project. (Alternatively. better describe additional work so <br />that there is some assurance that it is appropriate to gO to final design,) <br /> <br />5.0 GROUNDWATER HYDROLOGY <br /> <br />WWE performed a separate groundwater study of the Red Mesa Aquifer to obtain a better <br />understanding of the hydrogeology of the aquifer and its relationship to surface water flows in <br /> <br />991-077.115 <br />May 2004 <br /> <br />Wright Water Engineers, Inc. <br /> <br />Page 6 <br />