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<br />, ' <br /> <br />~p-toffs was set at 432 feet with a maximum deviation from vertical of <br />Q\J\.l\ <br /> <br />only 6 inches. This system provided a deep positive cutoff under <br /> <br />extremely difficult conditions. <br /> <br />Construction procedures required to assure integrity of the slurry <br /> <br />trench cutoff are not unusual or difficult to control. Accordingly, <br /> <br />excess costs are not a factor. In fact, the slurry trench cutoff <br /> <br />system is more economical than other proposed methods of seepage <br /> <br />control. <br /> <br />Collection of data for a stability analysis was started in September <br /> <br />1976 to confirm necessary design provisions for a stable structure. <br /> <br />Subsurface investigations at the end of the slurry trench as well as <br /> <br />pump tests are complete. Model studies utilizing these data are <br /> <br />underway. It is significant that, so far, data developed from the <br /> <br />study program are consistent with design criteria adopted for the <br /> <br />feasibility design. The stability analysis review by an independent <br /> <br />panel is expected in August 1977. <br /> <br />Steady state analysis conducted by the USGS has already verified that <br /> <br />seepage will not exceed about 50 ft3/s. <br /> <br />Data developed in the stability <br />" <br /> <br />analy.sis will also be utilized to assist in a transient state study of <br /> <br />the reservoir by USGS to determine seepage to and from the reservoir, <br /> <br />i.e., bank storage. <br /> <br />11 <br /> <br />~ ;........ <br /> <br />_. <br /> <br />I:"" <br /> <br />...-:-- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />l...- <br /> <br />~ <br />,. <br />i, <br />~, <br />I'. <br /> <br />~... <br />\ <br />I <br />, <br />, <br />i <br /> <br />t'. <br />r <br />f <br /> <br />-=- <br /> <br />~ <br />, <br />, <br /> <br />I <br />.u__~ <br />