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CONSULTING GEOTECHNICAL ENGINEERS AND MATERIAL TESTING <br />7 January 2013 <br />Western Fuels Association, Inc. <br />12050 North Pecos, Suite 100 <br />Westminster, Colorado 80234 <br />Attention: Mr. Douglas White,PE <br />PN: M12058MT <br />Subject: New Detention Pond Embankment <br />North Plant Site <br />Nucla, Colorado <br />Comments Regarding DRMS Review <br />Mr. White: <br />This letter presents comments in response to your 27 December <br />2012 e-mail letter regarding the DBMS comments. The results of <br />our analysis (rapid draw down condition) for the subject <br />Detention Pond were presented in our letter dated 10 October <br />2012. That submittal presented our analysis and included test <br />results of embankment samples of the fill material for strength <br />parameters. The calculated theoretical stability analysis used <br />typical embankment cross section and parameters noted. <br />Our report presented the results of the theoretical assessment <br />of embankment stability during a rapid drawdown condition, which <br />is the least stable embankment condition. This report presents <br />the results for the theoretical calculated minimum factor of <br />safety for a steady state seepage saturated embankment condition. <br />This analysis used a unit moist weight of 122.6 pcf for the <br />embankment soil materials. The data from the actual field <br />density tests indicate that the average moist compacted density <br />was about 122.6 pcf. <br />The strength parameters used in our analysis which were derived <br />from our direct shear strength tests are as follows: <br />- laboratory moisture content -dry density relationship <br />(Proctor) test, and <br />- direct shear strength tests of remolded material. <br />P.O.Box 3986 <br />Grand Junction, Co. 81502 <br />(970) 245 6506 <br />P.O.Box 45 <br />Montrose, Co. 81402 <br />(970) 249 2154 <br />Appendix 2.05.3(4)-6 Page 7 December 2018 (TR -19) <br />