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;: ~: <br />Richartl D. Lamm <br />Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTO N, Director <br />iii iiiiiiiiiiiu iii <br />DATE: September 11, 1985 .-- <br />T0: Candy Thompson - ~ J ~ ~_ <br />FROM: Jim Pendleton ~!~~ <br />RE: Northern oal any's Compaction Specification Amendment Request <br />Pursuant to your request, I have reviewed the recent submittal made by <br />Northern Coal Company regarding the compaction specification for the <br />backfilling and grading of the Northern No. 1 Mine. Northern Coal Company <br />requests that the backfill compaction specification be reduced from <br />ninety-five percent (95%) frgm the modified prior proctor compaction to <br />ninety percent (90%) of the modified proctor compactor standard. I do not <br />believe that this change would significantly affect the ultimate stability <br />acheived in backfilling and grading the portal areas of the Northern No. 1 <br />Mine. I have attached copies of earlier memoranda dated September 25, 1984 <br />and April 9, 1984, for your reference in this matter. As these memos <br />describe, I believe it is important to complete the three part certification <br />control and monitoring program in regard to the backfilling of the portal area <br />of the Northern No. 1 Mine. If appropriate control certification and <br />monitoring programs are conducted, I believe we can assure a stable final <br />backfilled situation at the mine. <br />JP/mis <br />Attachments <br />cc: Fred Banta <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />