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<br />'i <br /> <br />, The drilling, geotechnical and geophysical investigations will <br /> <br />be focused upon dete[lI\ining ehe causative mechanism{ s) of the <br /> <br />landslide, existing strength parameters, bedrock profile and ground- <br /> <br />water levels. The geophysical investigation may be used to establish <br /> <br />the alignment and depth of the reported, old, abandoned tunnel within <br />the hillside. <br /> <br />Hore detailed mapping of pre-slide and post-slide conditions <br /> <br />will be developed from aerial photography and mapping previously per- <br />formed by Delta Aerial Surveys plus field slope measurements of <br /> <br />existing conditions. <br /> <br />The mapping and geotechnical information will be used to perform <br /> <br />more detailed slope stability analysis of existing and potential <br /> <br />alternative configurations. <br /> <br />The potential remedial a.lternatives will be defined and <br /> <br />screened to approximately two primary alternates. <br /> <br />These two alte r- <br /> <br />natives will be analyzed to establish technical and economic <br /> <br />feasibility. <br /> <br />Cost estimates will be made of the two or three preferred <br /> <br />alternatives, the cost estimates will include construction engineering <br /> <br />and annual O&H cost to arrive at both a time series cost stream and <br /> <br />present worth of the alternatives. <br /> <br />The financial status (cost) <br /> <br />Stewart Ditch and Irrigation company will be examined to dete[lI\ine a <br /> <br />feasible annual repayment schedule and overall ability to pay. <br /> <br />U-4 <br />