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CONSULTING GEOTECHNICAL ENGINEERS AND MATERIAL TESTING <br />Western Fuels <br />12050 North Pecos <br />Westminster, Colorado 80234 <br />Attention: Mr. Ross Gubka,PE <br />28 November 2012 <br />PN: M12058MT <br />Subject: New Detention Pond Embankment, North Plant Site <br />Theoretical Embankment Stability <br />Nucla, Colorado <br />Mr. Gubka: <br />This letter presents the results of our analysis for the. <br />subject Detention Pond. Our analysis included testing embankment <br />samples of the fill material for strength parameters and then <br />performing a theoretical stability analysis using"a typical <br />embankment cross section. <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 />Our analysis included an assessment of the theoretical <br />stability of embankment slopes manufactured from the materials <br />tested. The constructed embankment configuration is generally as <br />follows: <br />- crest width, 10 feet, <br />- embankment height, 9.5 feet, <br />- embankment inclination: 3 horizontal to 1 vertical, up and <br />down stream slopes. <br />These dimensions imitate the embankment configuration used to <br />assess the theoretical calculated stability of the embankment <br />slopes. There are typically several conditions of an embankment <br />environment. These are: <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 2 December 2018 (TR -19) <br />