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<br />and en~ankment can be checked by use of equation number 2. Unfor- <br />tunately, the D15 of the embank~ent and foundation are not avail- <br />able. Based upon information t~at is available, it appears that <br />the filte~/foundation ratio will easily meet the criteria. The <br />same mayor may not be true for the filter/embankment ratio; for <br />this reascn a drain pipe will be installed along the toe of the <br />filter. The drain pipe will be six inches in diameter with holes <br />on the bottom half of the pipe. The holes must be smaller than <br />1.2 mm to meet the drain pipe c~iteria. <br /> <br />The filter blanket will cover the middle section of the south <br />dike, a distance of about 450 feet. The filter will begin three <br />feet below the crest of the dike and extend just beyond the <br />existing surface drain. Please see drawings App-1 and App-2. in <br />the appendix. The filter will be one foot thick which is the <br />thinnest that can be confidently placed. <br /> <br />The drain pipe will be placed in the existing surface drain <br />and will run the entire length of the filter. The pipe will <br />daylight into a surface drain that will convey the water away from <br />the filter. A measuring flume will be installed on the surface <br />drain. The drain pipe will ,be gurrounded by six inches of coarse <br />gravel which will be surrounded by at least six inches of filter <br />material. A french will have to be prepared below the pipe to <br />accommodate one foot of gravel and filter material. <br /> <br />About <br />required. <br />12 miles. <br />densities <br /> <br />1075 cubic yards Icy) of filter material <br />The nearest source is the Dolores River, <br />The filter will be compacted so that the <br />are between 70% and 80%. <br /> <br />will be <br />a distance <br />relative <br /> <br />of <br /> <br />The fill will begin ,at the crest 'of the dike and extend away <br />from the dike the same distance as the filter. Slopes at the <br />edges of the berm will. be 2 to 1. The berm will also be the same <br />length as the,filter. See Drawings App-1.and App-2 in the appendix. <br />The fill material will be borrowed from the reservoir basin near <br />the south dike but sufficiently far into the reservoir to assure <br />that the dike will not be affected. An estimated 3220 cy of <br />material will be required. <br /> <br />~riaxial tests were conducted On samples from the foundation <br />and embankment at Section #2 shown on the attached drawings. This <br />location was selected because .there are seeps in both the embank- <br />ment and foundation which does not occur at any other location. . <br />The results of the triaxial tests were utilized to evaluate the <br />stability of Section #2 against a failure by sliding. <br /> <br />A computer program, based on the simplified Bishop Method, <br />developed by Professor Yang H. Huang, was utilized to check the <br />stability. The program is called Rotational Equilibrium Analysis <br />of Multilayered Embankments and is explained in Professor Huang's <br />book, titled "Stability Analysis of Earth Slopes". <br /> <br />-29- <br />