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<br />A.3 Social Structure Impacts <br /> <br />There will be minimal impacts on existing neighborhoods and communities or on <br />employment. The project will not increase the storage of the reservoir; therefore, will not impact the <br />surrounding lake front property landowners. <br /> <br />B. Institutional Considerations <br /> <br />The institutional requirements for the project were previously addressed in Section A. <br />Table V-I lists the institutional requirements for the project. <br /> <br />Table V-I <br />Institutional Requirements <br /> <br />Agency Requirements <br />U.S. Army Corps of Engineers Nationwide 404 Permit <br />Water Quality Control Division Construction Dewatering Permit <br /> <br />C. Comparative Evaluation <br /> <br />The alternatives were evaluated based 011 cost and technical merit since the previously <br />mentioned evaluation factors are common to the alternatives considered for the project. <br /> <br />Alternative 1 - Replacement <br /> <br />Between the two alternatives, replacement and no-action, replacement is the most feasible <br />to meet the project goal to utilize the reservoir for irrigation. The existing 24-inch CMP would <br />be excavated and replaced with a 24-inch steel pipe encased in concrete. The pipe would <br />discharge into a USBR impact basin. Toe drains would be constructed along the toe of the dam <br />that would discharge along side the impact basin. Table V-2 lists the costs associated with the <br />replacement of the outlet pipe and toe drain system. The estimated construction cost with <br />construction engineering and 20 percent contingencies is $375,000. Boyle believes that the <br />technical and financial aspects make this alternative a viable solution for the rehabilitation of <br />Lake Arrowhead Dam. <br /> <br />Lake Arrowhead Dam Rehabilitation Feasibility Study <br /> <br />11 <br /> <br />SfDVLE <br />