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<br />YELLOW JACKET PROJECT <br />GEOTECHNICAL INVESTIGATION <br />LAKE AVERY ANO WARNER POINT DAM SITES <br /> <br />lJ<<flFT <br /> <br />The fOllowing is an outline and cost estimate for feasibility level geotech- <br />nical investigations for the Warner Point and Lake Avery dam sites. These <br />sites were selected as the most favorable storage alternatives in the Yellow <br />Jacket Project Study. Neither program includes investigations for delivery <br />systems to oil shale, coal, agriculture, or municipal users. The Avery pro- <br />gram, however, provides for investigation of the diversion dam on the White <br />River and conveyance pipeline, as these are essential to the feasibility of <br />the project. It is expected that both of these investigations can be com- <br />pleted in six months, if initiated in the spring. <br /> <br />Initially, detailed topographic maps will be prepared for each site and suit- <br />able survey control installed. Detailed geologic mapping will then be done <br />for each project, covering the entire impacted area, with special emphasis on <br />the dam sites themselves. At Avery, attention will be given to denoting the <br />bedrock/gravel and gravel/overburden contacts on the left abutment, At Warner <br />Point, the emphasis will be on detection of evaporite facies within the reser- <br />voir or left abutment and in characterizing the nature of the left abutment. <br />Based on the surficial geologic mapping, the subsurface investigation will be <br />laid out. It is anticipated that the programs for each site will be generally <br />as follows: <br /> <br />Lake Avery Dam Enlargement <br /> <br />Four boreholes were drilled at Lake Avery by the USBR in 1976 and a seismic <br />refraction survey of the left abutment was carried out by IECO in 1982. These <br />studies have shown that the feasibility of the project depends on the permea- <br />bility characteristics of the left abutment; therefore, the proposed investi- <br />gation is oriented toward determinin9 those characteristics. <br /> <br />Drilling - Four holes, approximately 200 feet deep, would be drilled along <br />the centerline of the proposed dam on the left abutment. Special attention <br />will be given to in situ permea~ility testing. USBR experience showed drilling <br />1 <br />