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:~ Richard D. Lamm Governor III IIIIIIIIIIIIIIII DEPARTMENT OF NATURAL RESOURCES David H. Getcnea, Executive Director MINED LAND RECLAMATION DIVISION DAVID C. SHELTO N, Director DATE: April 25, 1984 T0: Sandy Emrich FROM: P. C. Saletta RE: Stipulation Review - Empire Energy Corporation Eagle No. 5 and No. 9 Mines - Permit No. C-044-81 As per your request, I reviewed the response to Stipulations No. 16 and No. 18 as submitted by Empire Energy Corporation. Stipulation No. 16 The response to Stipulation No. 16 is adequate. In review of Map IV-10 Reclamation Map and cross-section Drawings IV-14 through IV-24, I find that there is sufficient information to verify the accuracy of post-mining topography and volumetrics presented on Table IU-6. All cross-sections except for B-B' baseline (No. 5 Portal) have pre and post-mining contours drawn on Map IV-10. The No. 5 Portal area does not have post mine contours clearly drawn on Map IV-10. However, the cross-sections are clearly and accurately drawn on Drawings IU-22, IV-23 and IV-24. If the operator has committed to backfilling and grading the No. 5 Portal area as indicated on the B-B' baseline cross-sections, I find this to be satisfactory. The operator should be clearly informed that the reclamation map does not show the anticipated contours for the No. 5 Portal area on Map IV-10. The final cross-sections drawn for the 6-B' baseline conform with existing topographic profiles and approximate original contours. In response to Stipulation No. 16, the operator submitted the mathematic formula which was used to calculate volumes. The formula used is referred to mathematically as the volume for the frustum of a pyramid and in engineering derivation of this formula is used which is know as the prismoidal formula. Use of this formula is an accepted engineering practice and is more accurate, than the end area method.l The operator has adequately demonstrated that the methodology used to determine the reclaimed configuration is in compliance with Rule 4.14. The information submitted is adequate to determine volumetrics and post-mining topography. The information submitted satisfies the requirements of Stipulation No. 16. 1 CRC Standard Mathematical Tables, p. 15 and, Mo a an ouc ar ., urveying, p. 685 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (30:t) 866-3567