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DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches, Executive Director <br />iiiiuiiriiiiiuiii <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SNELTON, Director <br />Richartl D. Lamm <br />Governor <br />T0: Joe Oliver <br />FROM: Jim Pendleton <br />RE: Empire Energy C <br />Technical Revis <br />MEMORANDUM <br />4 September 1984 <br />ion's Semi-Annual Subsidence Report & <br />uest - Permit Number C-044-81 <br />Pursuant to your request, I have reviewed Empire Energy Corporation's <br />semi-annual subsidence monitoring report for the Eagle #5 anti #9 Mines. The <br />report is prepared in accordance with the approved format. The report <br />indicates that subsidence has continued to develop above the monitored panelec <br />portions of the #5 Mine, approximately as predicted. In general, maximum <br />vertical subsidence has exceeded the projections contained within the original <br />permit application by up to 25X. The average angle of draw Fias proven to be <br />16°, but variation has been large, from 4.8° to 24.1° from vE~rtical. <br />The subsidence monitoring report is acceptable as submitted by Empire Emergy <br />Corporation. <br />Empire Energy also requests a technical revision to Permit No. C-044-81 to <br />reduce the monitoring frequency of the subsidence monitoring points shown on <br />the attached drawing, number EEC-83004-C, to an annual basis,. The operator <br />proposes to complete the annual survey during the summer months. to facilitate <br />access to survey monuments. I have no objection to this revision, with the <br />following conditions: (1) The "E" series monuments adjoining the gas pipeline <br />shall continue to be surveyed on a semi-annual basis, and (2) Surveying of <br />the "F-1" monument shall return to a semi-annual frequency upon resumption of <br />mining within the Eagle #9 Mine. With the imposition of these conditions, <br />approval of the annual subsidence monitoring survey frequent;/ is acceptable. <br />cc: Mike Long <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (30'x) 866-3567 <br />