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<br />'-';/'- ,-- <br />..of <br /> <br />l", ,..,.,.... <br />t 4 i <br /> <br />. <br /> <br />G. F. Sowers: "Based on the data available and on the feasibility <br />analysis and the preliminary designs that have been prepared, it <br />is my professional opinion that a safe dam can be designed and <br />constructed on this site." <br /> <br />T. M. Leps: "* * * we fores"e no reason why a safe dam could <br />not be constructed at the Narrows site." <br /> <br />, H. A. Coombs: "Information available at present is sufficient <br />to establish a preliminary design for the Narrows Dam" although <br />Mr. Coombs' statement does not use the word 'safe' there is <br />little doubt that it was implied since his introduction states <br />'The review is to determine if a safe foundation exists and if <br />a safe earthfill structure can be constIUcted upon it. '" <br /> <br />2. Is the embankment design proposed by the USSR satisfactory for <br />the feasibility design stage? <br /> <br />. <br /> <br />Both Leps and Sowers agree with the general cross section proposed <br />by the USBR and support the idea of a chimney drain and a horizontal <br />drainage blanket. Mr. Coombs, as a geologist, is not versed in <br />embankment dam design and did not address the embankment design <br />question. Mr. Leps and Mr. Sowers suggest that the USSR consider <br />a number of points when collecting information for the final <br />designs. None of the consultants' reports criticizes the type <br />of dam or recommends a different type or cross sectional con- <br />figuration of the embankment. <br /> <br />( <br /> <br />\_~ <br /> <br />3. <br /> <br />Were the data supplied to the consultants sufficient? <br /> <br />None of the consultants' reports noted any deficiency in the <br />data supplied. <br /> <br />4. Was there any criticism' of the proposed foundation treatment <br />far the dam? <br /> <br />No consultant criticized the proposed foundation treatment but <br />several suggestions were made for improving the details of <br />treatment. <br /> <br />5. The consultants agreed that the following items should be <br />addressed or confirmed during final designs: <br /> <br />1;2.0. <br /> <br />a. The surface of the Pierre formation should be thoroughly <br />explored along the dam's axis. A continuous seismic profile <br />would be helpful. <br /> <br />,--,' <br /> <br />b. The permeabilities of all strata of alluvium on the south <br />abutment should be determined by testing. <br />, <br />