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<br />t <br /> <br />-.(l~~{: <br />~uvr.J <br /> <br />Woodward.Clyde Consultants <br /> <br />t <br /> <br />Colorado Water Conservation Board <br />February 16, 1978 <br />Page 3 <br /> <br />t <br /> <br />The right abutment seepage analyses performed by the Bureau <br />is, in our opinion, rigorous and conservative. we believe <br />that the conservatism built into this study is appropriate. <br />The analyses indicate, and we agree, that fully penetrating, <br />relief-drain wells should be construct~d/to develop low <br />level seepage exit gradients. In ord~r/to increase the <br />assurance that the wells will be ope~a61e during the life <br />of the structure, we believe the lohg~~rm integrity of <br />the planned relief wells should be' s.tud'i,ed.....and a monitoring <br />and maintenance program developed~.I ~ <br /> <br />Further, we are of the opinion/ihat the consequences of <br />seepage through construction;lf~aws (windows) in the slurry <br />trench should be studied. pr{or to any further expensive <br />seepage model studies, we/~~!ie~?that the hydrologic <br />data base should be improv~d.~ <br /> <br />f h " '" h" h b <br />I you ave any quest10ns concern1ng t 1S report or tea ove <br />summary, please call. ~ <br /> <br /> <br />t <br /> <br />t <br /> <br />t <br /> <br />Very truly yours, <br /> <br />. <br /> <br />S. T. Thorfinnson ~ <br />Executive Vic=_pr'i~J______ ____ ______ __u_______ _ _ _ _ <br /> <br />-q ---l>~H:~l~--_u V I -:::; <br /> <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br />