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<br />' December 1986 3 <br />1,2 Purpose and Scope <br /> <br />863-2052 <br />The site investigation described in this report was performed <br />with the purpose of confirming or modifying (if necessary) the <br />assumptions and results of the previous excess spoil slope <br />stability analyses. The scope of the field investigation and <br />associated analyses was outlined in our proposal to Yampa Valley <br />Coal Corporation dated August 20, 1986. Tasks involved, which <br />are in response to concerns raised by the MLRD, are briefly <br />described as follows: <br />1) Characterization of geotechnical conditions at five <br />representative locations near the toe of the proposed <br />excess spoil placement areas through a program of soil, <br />rock, and spoil material sampling; <br />2) Monitoring of ground-water conditions in the vicinity of <br />the borings; <br />3) Reconnaissance of excess spoil placement areas to iden- <br />tify any adverse geologic conditions which could <br />potentially affect spoil stability; <br />4) Laboratory classification testing to determine whether <br />the materials sampled are similar to the assumed mate- <br />rials whose properties were used in the slope stability <br />analyses; <br />5) Evaluation of the capacity of underdrains to handle <br />estimated flows and development of filter specifications <br />to prevent clogging of the drains; and <br />6) Performing new slope stability analyses if necessary due <br />to weak foundation materials being encountered or <br />ground-water conditions being different than previously <br />assumed. <br />Golder Associates <br />