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<br />""l';;~::" <br />" <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />,-.;..~~.;t.~.;:~., r': ' <br /> <br />". ..~.;.. <br />"',:"...;.>!ji:":r" <br /> <br />. . '''iF~'t.::f~~~~~(" ,. <br /> <br />.;,:'ijJ:~~:';Zr'~~;'/,~,:, .;.:-;. . <br /> <br />;, ~ : <br /> <br />00.1943 <br /> <br />sUrncieni daia ror the interpretation. The data obtained musi be carefully interpreted to <br />identify and evaluate the geologic conditions causing the large grout takes. The CRB <br />would like the opportunity to review and discuss this interpretation with Reclamation as <br />soon as practical after it is completed. <br /> <br />ADDITIONAL CRB COMMENTS <br /> <br />Accountability report for CRR meeting No, 5: <br /> <br />The CRE has reviewed the Accountability Report to the CRB Report, CRB Meeting No. <br />5 - Ridges Basin Dam - Anllnas-LaPlata Project, Colorado, dated April 3, 2005 and <br />agrees with Reclamation's responses to the suggestions and recommendations presented <br />in the CRB report. <br /> <br />Construction Geology Update dated April 2005: <br /> <br />The CRB commends Reclamation staff for the excellent construction geology update and <br />looks forward to receiving similar updates in the future. <br /> <br />Basin Creek Diversion <br /> <br />The diversion concept envisions storage of Basin Creek summer 2005 runoff within the <br />pool behind the upstream cofferdam, currently under construction to elevation 6745. <br />Storage capacity within the pool behind the cofferdam is as follows: <br /> <br />· Dead storage to elevation 6730, 143 ac ft, <br />. Construction use pool to elevation 6737, 385 ac ft <br />. Flood pool to elevation 6742, 563 ac it, <br />. Freeboard above the flood pool, 3 ft. <br /> <br />The estimated 3-day summer flood volumes are as follows: <br /> <br />. 5-year flood, 101 ac ft <br />. 10-year flood, 154 ac ft <br />. 25-year flood, 244 ac ft <br />. 1 OO-year flood, 463 ac ft <br /> <br />Based on the above, the storage capacity of the flood pool exceeds the volume of the 100- <br />year flood event. 1t is understood that the outlet works tunnel can accept any flows that <br />might exceed the storage capacity behind the cofferdam. The tunnel will be used for <br />creek diversion during the spring 2006 runoff. <br /> <br />The CRE concurs with the diversion and storage concepts as outlined above. <br /> <br />-6- <br />