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Fiantinti mitt cintes <br /> CONSULTING GEOTECHNICAL ENGINEERS AND MATERIAL TESTING <br /> 28 November 2012 <br /> Western Fuels <br /> 12050 North Pecos <br /> Westminster, Colorado 80234 <br /> Attention: Mr. Ross Gubka,PE <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 />