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<br />project was described as part of BME's first mid-term technical revision request. Map 137 shows the <br />location of the nine alluvial wells. This monitoring program is discussed further in Section II.C. <br />(10) Report Preparation Reports to DMG included the following: <br />Brief description of analytical photogrammetry, including references on accuracy. <br />Description of the monitoring program. <br />Statement of BME subsidence predictions. <br />Results to date. <br />Comparison between the prediction and results to date. <br />Half-foot subsidence difference wntour map and profiles for each survey. <br />Printout of the elevation data. <br />Topographic base map. <br />The data derived from subsidence monitoring is expected to enable BME to make accurate predictions <br />of subsidence and strain over subsequent panels. It will be possible to make accurate predictions of <br />the timing and magnitude of any subsidence that may affect the county road, so that BME can take <br />appropriate actions, i.e., repairs and traffic control. Similar predictions will also be possible for panels <br />that may produce subsidence near Red Wash and Scullion Gulch. Upon completion of production <br />• mining within room and pillar panel RP-1 and longwall panel LW-1, BME was to prepare analysis of <br />the subsidence monitoring data collected to that date. If the results of that analysis determined that a <br />revision of the mining plan for the remainder of the mine was appropriate, BME was to complete the <br />appropriate revisions and submit them to the regulatory authority for review. Analysis of LW1 <br />subsidence data showed that a revision in the mine plan was not warranted. BME requested and <br />DMG waived the subsidence monitoring requirements of RP-1 by analytical photogrammetry as long <br />as significant unanticipated ground movement did not occur above RP-1. BME wntinued visual <br />inspection above RP-1 twice a year through 2001 with no impact of concern noted. A report of such <br />inspection was submitted annually. The annual reports included a description or sketch of the visual <br />inspection route, and description, location, and photographic documentation of any potential <br />expressions of suiiace subsidence, along with a description of any repairs conducted. If future <br />significant ground movement above RP-1 is noticed and if DMG so directs, BME will recommence <br />inspections and/or complete an aerial photogrammetric survey and submit a subsidence map within six <br />months of DMG's request. DMG and OSM have determined that the best mitigation for <br />archaeological sites subject to potential subsidence was to limit access to the area and limit <br />access to the location information. It was determined that subsidence itself did not produce a <br />detrimental impact to the cultural resources. Subsidence is expected to produce no long term <br />impacts on these sites. <br />• Midterm Review (8/2002) III-25 <br />