1992-02-10_GENERAL DOCUMENTS - C1981017 (2)

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°F cow 5TATE OF COLORADO Roy Romer, Governor 1876 DEPARTMENT OF NATURAL RESOURCES 1 MINED LAND REC MATION DIVISION FRED R. BANTA, Director November 15, 1988 Ms. Diane Delaney Mid-Continent Resources, Inc 201 Centennial Street, Suite 406 Glenwood Springs , Colorado 81601 RE: Permit Renewal , Coal Bain Mines , C-017-81 , Subsidence and Bench Area Stabilization Dear Ms. Delaney: Dr. Pendleton has reviewed t e above-referenced submittals. His comments are enclosed. Concerning the subsidence plan, Dr. Pendleton has recommended that several stipulations be imposed on the permit. In order to simplify the permitting process, Mid-Continent should revise the subsidence monitoring section of Chapter 4 to include a commitment mimicking the wording of Stipulation 1 as detailed in Dr. Pendleton's enclosed memo. Dr. Pendleton's recommended Stipulation No. 3 concerning subsidence has already been covered by Mid-Continent's commitment on page 37 of Chapter 4 to provide a monitoring program plan acceptable to MLRD prior to implementation of the multil ft longwall technology. Stipulation No. 2 requires a reassessment of the extent of the potentially subsided area and impact based upon the 1988 subsidence survey. This needs to be committed to by Mid-Continent within the narrative on subsidence. More specifically, the statement on page 37 , extracted from Dr. Pendleton 's earlier memo, stating that the 18 decree angle of draw and .30 as the subsidence factor is no longer valid ba ed on the new survey. Regarding the landslide on the No. 3 road, Mid-Continent's proposal is acceptable and narrative should be included in the permit to describe the proposed plan. The reclamation plan for the portal area is also acceptable. No further action needs to be taken on this section. 215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel.(303) 866-3567