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tJCT.31.1997 4:52PM <br />DIViMINERRLS&GEOLOGY <br />iii iiiiiiiiiiiu iii <br />999 <br />STATE OF <br />DIVISION OR MINERALS AND GEOLOGY <br />Department of Natugl Resources <br />13 t 3 Sherman Sr., Room 215 <br />Denver, Colorario 80203 <br />Phune: 170]) 866-3567 <br />FA%:(30]1832.0106 <br />interoffice <br />MEMORANDiJM <br />te: Dan Mathews <br />from: ~U~. Walker <br />subject: Slope Stability Analysis Review - TR 22, Pond 12, G81-041 <br />date: 16 October 1997 <br />N0.511 P.2i2 <br />Roy Romer <br />Govern0. <br />lamef S. WcFlheatl <br />EecurM! Dlrecsor <br />Michael 6, wng <br />Divi,lon Dlmcror <br />The purpose of this interoffice memorandum is to provide you with the results of my review of <br />stability analysis per your requesk My review consisted of reading the analysis provided and <br />comparing the circle analysis to one aging SB-Slope Version 3.0, a soft ware program commonly <br />is use within the Division. <br />Soil and field (dimensions) parameters used were those supplied by the operator. The analysis <br />configuration was es described in the Oct-10-97 02:44 Lincoln DeVore of Grd Jct 970-242-1461 <br />p.15 facsimile. Point locations and soil information were as described on page 3 of the facsimile. <br />The diagram does not correlate completely with the input liwtw In my telephone call of 16 Oct <br />97 to Bd Morris of Lhtooln DeVora, Mr. Morris stated that he deleted the Soil Typc I in his <br />analysis, replacing it with soil type I. My analysis has the same substitution. His runs indicate <br />mitrimum factors of safety of 1.589 and 1.423 ((ieoslope Program). My eaalysis gave a factor of <br />safety of 1, 565 (SB-Slope Program) . <br />In my discussions with Mr. Morris, he described the soils as silty, very subject to piping. Tltis_ <br />being the case, the analyses are suspect is That integrity of the soils i9 accepted as fact Care <br />must be taken in the field to insure the soils are placed and compacted as desired, and no <br />unforseen geotechnical feature is encountered. A rupture is the compacted Iiner (fmm initial <br />construction or cleaning activities) may result in piping through the embankment, with potential <br />for a conduit for drainhtg the pond, and perhaps an embankment failure (erosion or flow failure). <br />Please cal! me if you have any quest[ons. <br />cc: Larry Routten <br /> <br />