Laserfiche WebLink
<br />U..,,,,~ c-: <br />~...J <br /> <br />8 <br /> <br />determining if piping will occur. <br /> <br />2. I concur with their recommendation that pressure relief <br /> <br />wells could provide a safe exit gradient. The wells should bottom in <br /> <br />good Pierre Shale. <br /> <br />3. Since there is not a detailed description of the cwo- and <br /> <br />three-dimensional models in the Memorandum, it is difficult eo judqe <br /> <br />the predictive capability of the models used. <br /> <br />4. I concur with the recormnendation that a t.~ree-di.mensional <br /> <br />model he used to determine the beneficial effects of the cutoff ~all <br /> <br />operating simultaneously with pressure rel~ef wells. <br /> <br />S. The permeability values in the lower alluvial sands and <br /> <br />gravels are quite high. These should be checkec. If the values were <br /> <br />lower, the hydraulic gradient in ~~e buried channel would he higher, <br /> <br />resulting in greater uplift pressure. <br /> <br />A Memorandum by the U.S. Bureau of ReclaI:lation on the subject <br /> <br />"Permeability Testing(Narrows D~~tarro~s Unit/pick-Sloan Missouri <br /> <br />:Basin Program" arrived on December 23, 1977. This is a preliminary <br /> <br />report giving conclusions based on an aquifer (pump out) test ~.d ten <br /> <br />pe:%meability (pump in) tests. The results of these investigations <br /> <br />provide a better data base for determining the probable behavior of <br /> <br />groundwater in the south bank of the river when the reservoir is <br /> <br />raised to its ultimate height. The results of these latest studies <br /> <br />correspond quite ~ell wi~ the studies ~y the u.S. Geologic~l Survey <br /> <br />10 <br />