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Subsidence Monitoring Program i r ~~ r~ I~ -52- ~ LJ .~U~ 0 Empire Energy Corporation proposes to conduct a subsidence monitoring program at the Eagle Mine complex. Empire Energy Corporation has committed to monitor the elevation and orientation of all residences existing within Empire Village and the private residence located within the NE 1/4 of the SE 1/4 of Section 30 of T6N, R91W. This survey monitoring shall be completed quarterly and the results included within the semi-annual subsidence monitoring report, to be submitted in accordance with Rule 2.05.6(6)(c)(1)(E). In addition, the applicant proposes to install and monitor survey monuments in various locations within the proposed permit areas of the Eagle No. 5 and No. 9 mines. The Empire Energy Corporation's monitoring plan proposes monument installations as depicted on Map IV-7 of the permit application. Monuments are depicted above panels of the 3rd-East area of the Eagle No. 5 mine (labeled as Monument Series A, B, C and D). Monuments are also indicated adjoining the oil pipeline (labeled as Monument Series E), State Highway 13 (labeled as Monument Series F) and adjoining the Rio Grande and Western Railroad Spur (labeled as Monument Series G). Finally, art additional high resolution grid network of survey monuments is Indicated above a panel area adjoining the First West submain area of the Eagle No. 9 mine (labeled as Monument Series H and I). As of this time, five subsidence monitoring reports have been submitted in conformance with the existing permit for the Eagle No. 5 and 9 mines. These monitoring reports have included surveying results for the entire Monument Series A through E and single Monument #F-1, located above the North Main slope of the Eagle No. 9 mine in the immediate vicinity of State Highway 13. As discussed above, the results of this initial subsidence survey monitoring have provided some initial insight into the character of observed subsidence at the Eagle mine complex. In general, observed subsidence above partially extracted areas has exceeded analytical projections, while maximum vertical subsidence above retreat pillared areas has been less than that originally predicted. In response to Stipulation 22 of the September 2, 1983 findings document, Empire Energy Corporation submitted a format to facilitate interpretation of future subsidence monitoring reports. It is an acceptable format, except that the summary sheet should be amended to include a tabular summary of horizontal survey location data and cumulative observed horizontal differences. State Highway 13 and County Road 107 cross above the projected underground mine workings of the Eagle Mine complex. Empire Energy Corporation commits within the permit application to installation of subsidence monuments adjoining State Highway 13. Because of the possible exposure of the public and employees to health and safety hazards, the Division stipulated in the September 2, 1983 document that Empire Energy Corporation is to supplement the proposed subsidence monitoring for State Highway 13. Empire Energy Corporatlon has committed in the permit revision application to visually monitor portions of Highway 13 and County Rad 107 within the permit area on a daily basis. The Division finds the Eagle No. 5 and No. 9 Mines to be in compliance with the requirements of Rules 2.05.6(6) and 4.20.