Laserfiche WebLink
<br />~I <br />chen and associates <br />CONSULTING GEOTECHNICAL ENGINEERS <br />96 SOUTN ZUNI STREET • DENVER, COLORADO 80273 • 3001741109 <br />Subject: Revision to Soil and <br />Foundation Investigation <br />for 14 Sedimentation Ponds. <br />Kerr Mine Permit, East of <br />Walden, Colorado. <br />Leonard Rice Consulting Water <br />Engineers, Inc. <br />2695 Alcott Street <br />Denver, Colorado 80211 <br />Attention: Mr. Les Botham <br />Gentlemen: <br />November 12, 1980 <br />Job No• 20,411 <br />As requested, we have reviewed our soil and foundation <br />investigation report for 14 sedimentation ponds, Kerr Mine Permit, <br />East of Walden, Colorado, (Job Nc. 20,411). The purpose of the review <br />was to clarify the safety evaluation section of the report. <br />We understand that the Office of Surface Mining has inquired <br />S~ about the factor of safety reported in regard to the larger dams at <br />the project. The factor of safety reported was based on procedures <br />presented in published data. Our safety evaluation assumes low soil <br />strength properties and the rrost severe loadi:~g case on the <br />embanlanent. The analysis resulted in a minimum factor of safety of 2 <br />for the largest embanlarents. T'he factor of safety for the smaller <br />etr~banlanents was consistently higher than this value. <br />The revision consisted of the insertion of two additional <br />sentences in the first paragra~T on Page 12 of our report, and the <br />retyping of Pages 13 and 14 are •9~~e to the inserted material. <br />If we can be of further service, please let us know. <br />~`^.FiAE! !y <br />`" ~-~. <br />~ ~.. <br />( "~ ~+ <br />;.~i;? f <br />~' <br />=~ <br />RIB/bn `%~ ~`~; <br />Rev. By: ITrM.JCr',~C'ti~~ <br />EnC1S. `>:e~ <br />Sincerely, <br />~ CHEN AND ASSOCIATES, INC. <br />:~~ <br />a; -/ <br />'; BY ~./~~ <br />~;'~ r L. Barker <br />OFFICES: GASPER • COLORADO SPRINGS ~ GLENY/OOD SPRINGS ~ SALT LANE CITY <br />