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<br />Post Onia Bos 2140 <br />Meeker. Cokxado 81641 <br />TekpAorc (3031878-4021 <br />August 15, 1985 <br />AUu 1 91935 <br />MINED LAND <br />RECLAMATION DIVISION <br />Ms. Candace Thompson, Hydrologist <br />Colorado Mined Land Reclamation Division <br />423 Centennial Building <br />1313 Sherman Street <br />Denver CO 80203 <br />RE: Backfilling & Grading - Northern No. 1 Mine <br />Dear Candy: <br />proctor compaction <br />Our Reclamation Plan for the IQorthern No. 1 Mine calls <br />for the backfilling of the portal bench area to be done <br />in six inch lifts with the achievement of a 95% >r.odified <br />In discussing this with the contractor and supervising <br />engineer, we find that this percent compaction will be <br />almost impossible to achieve. They feel that a 90% <br />compaction is much more realistic. <br />Stipulation No. 14 of the Mining Pernit addresses how <br />we plan to monitor the resulting slope stability. We <br />feel that by placing the material carefully and by <br />compacting to a 90% modified proctor, we can achieve a <br />stable slope, We will be able to demonstrate this by <br />the already submitted tability Plan. <br />Sinc rely, <br />n/j{/~ I <br />1 <br />Hank Coufos, <br />Mine Superintendent <br />HJC/mah <br />III III IIIIIIIIII III <br />999 <br />Northern <br />Coal <br />Company ~F~ <br />~~~'w f) ~a ~~ <br />