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.llr. Tani,-InAm°n <br />O~~Ler 1Lnrns Conrp°n) <br />Oi/1-/00 <br />P~ ~ <br />I <br />• <br />• Bench Fills Static Factor of Safety (Phreatic surface 9 feet into fill): 1.38 <br />• Bench Fills Sntic Factor of Safety (Phreatic surface 1~ feet into fill): 1.27 <br />• Pond D Embankment Factor of Safe[v 2.00 <br />• Soil Stockpile Static Factor of Safety: 1.30 <br />Conclueione and Recommendations <br />Based on the information provided by OMI, it appears that the proposed bench fills, pond D <br />embankment, and soil stockpile and meet standard acceptable safety factors (1.3) for the <br />conditions analyzed This stability study was, however, conducted based solely on infottnation <br />collected by others. X11 material properties were based on the information provided Therefore, it <br />is recommended that furthez testing be performed on the subgnde and soil materials in order to <br />confirm the strength parameter used in the analysis. In addition, we also recommend that the <br />need Eor phrntic surface monitoring will be further evaluated based on the results of the material <br />testing. This will assure that the stability of the brnch fill is not compromised due to rise of the <br />phreatic surface within the valley fill or soil stocl~iles. <br />In order to achicve the design parameters, it is recommended that the following procedures be <br />utilized in the cons¢uction of the bench fills and pond embankmrnt <br />• <br />1) [lave a Registered Engineer verify fill and subgnde properties poor to <br />construction. <br />2) Construct embattkmrnt in maximum 2-foot horizontal lifts. <br />3) Compact each individual lift to 90% of Standard Proctor using available <br />equipment <br />We hope this letter meets your needs. If you have any questions or comments, please feel free to <br />contact the undersigned <br />Sincerely, <br />• <br />Montgomery Watsoa <br />~~ ~I <br />.~~„~,~ \ ,,~~11LIIIItINry <br />Craig ~1. Burger `~~ ~~ pEGlf f~ ~~. <br />~ssoaate Engineer ~ v~ d• • ~••.• ' <br />`~ r b~ fat. <br />• x <br />_ = 1459 i m <br />• •W <br />W <br />SenioraEn L,eidich %O~Fir'•..w"~~V~O <br />Bu' ~i.._ TONAL ...~~ <br />