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Xmithert Cdr z <br /> 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 DBMS 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 P.O.Box 45 <br /> Grand Junction,Co.81502 Montrose,Co. 81402 <br /> (970)245 6506 (970)249 2154 <br /> Appendix 2.05.3(4)-6 Page 7 December 2018(TR-19) <br />