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iti iiiiiiiiniu iii <br />999 <br />WREIYCE G. WFFITE P.E. <br />1650 M. STREET PENROSE, COLORADO 81240 <br />z. ~ lam::-'- r~ 7 R.n :-y; <br />:' r M1-,- <br />ia!'R 1 £; ~~3'30 <br />719-372-6461 <br />Apr i l 16, 1990 A~il~ J ~i.;`,Q <br />Mr. Larry Routten <br />Senior Reclamation Specialist <br />Mined Land Reclamation Division <br />1313 Sherman Street, Room 21S <br />Denver, Colorado 80203 <br />Sub,iect: Twin Pines No. 2 Mine, Permit Na. C-63-058, <br />North Spoil Area, Test results <br />Dear Mr. Routten: <br />Enclosed herewith please find the results of testing to determine <br />the final slope design of the North Spoil Area at Twin Pines No. <br />2 Mine. The results do indicate that a safety factor of 1.5 or <br />greater can be achieved with the original pile design. insitu <br />compaction tests will be taken quarterly to ensure the safety of <br />the pile along with appropriate certifications. <br />Very ruly yours: <br />Law n~te P.E. <br />Enclosure: Lincoln Devore Slope Analysis and Test Results, dated <br />April 10, 1490 <br />1 <br />