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<br />48 <br /> <br />. <br /> <br />.'; ['.' . ~ :;. <br />l.ut....: <br /> <br />~~d ~lso for the heel of the masonry structure to be <br /> <br />built. If this were overtop~ed by floods they would fill <br /> <br />tho pit with water only, w!,ich could be quickly pumped out <br /> <br />when the flood had p~ssed ~d the excavation of the addi- <br /> <br />tional foundation and pl~cing of foundation concreto ceuld <br /> <br />proceed at all times When the river flow is below the <br /> <br />capacity of the tunnels; and this would mem without serious <br /> <br />or expensive interruptions except during ~he brief <br /> <br />season of high watQr in ~ 3nd June. <br /> <br />The method just described for meeting foundation <br /> <br />. <br /> <br />condi tions in Boulder Ca.~yon has been successfully ~rri ed out <br /> <br />in placing the foundations for the Shoshone "nd the Arrowrock <br /> <br />d~s, the highest yet built by the Recl~tion Service. The <br /> <br />dept;1 to foundation at Arro'wrock waS "bout 100 feet, and on <br /> <br />tho Shoshon,) about 90 feat. At Boulder CiUlyon the depth is <br /> <br />gre3t~r and the que~tities arc larger, but it is practicable <br /> <br />to ..ssembl" a l!l\loh l2'.\,ger construction outfit c.nd to make <br /> <br />moro strenuous spoed than was found necessary at either of <br /> <br />the two locations mentioned. These experiences ~avs led <br /> <br />those familie.r wi th, t::"~m to cond ude thJ.t the p13cing of the <br /> <br />foundation in Boulder C;myon for ~ concrete dam by the above <br /> <br />method is entiNly feasible and not unduly exrenGive. <br /> <br />If this is: true, the pl~ of blol'ling the clirls into <br /> <br />. <br /> <br />place for a rock fill dam is not necessary to solve the <br /> <br />problem. It may, however, ~~ve advantages of econoITlf, but <br />