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Spring, water supply for Stucker Mesa Domestic Water Company, is located in the <br />upper reaches of this draw. Bowie Resources Limited submitted, to the Division, a <br />signed copy of a water replacement plan agreement between Bowie Resources Limited <br />and Stucker Mesa Domestic Water Company (see permit application, Volume lA, <br />Section 2.05.6, pages 98A [o D. <br />Subsidence Monitorine Program - <br />Bowie Resources Limited maintains a subsidence monitoring program with three <br />components; visual inspection, wide-spaced grid subsidence monumentation, and <br />closely spaced, high-resolution subsidence monuments. The visual inspection phase <br />consists of a walk-over of the ground surface above mined areas on asemi-annual <br />frequency. In future permit periods, when renewable resource lands and structures may <br />be undermined, pre- and post-mining inspections of structures will be incorporated. The <br />applicant also commits to daily inspection of the Steven's Gulch road, in order to protect <br />the public. <br />Monitoring stations No. 1 through No. 27 comprise awide-spaced monument grid on <br />approximately 1300-foot centers east-west and 2600-foot centers north-south. These <br />monuments provide general observations regarding the magnitude of vertical subsidence <br />occurrences. Additional wide-spaced monuments No. 70 through No. 87 will be <br />installed above proposed mine workings adjoining the old east portals. Monuments with <br />the notations of some of the DH 50 series, DH-60 series and the 90 series have been <br />installed above the underground workings at the West Mine. Several of the 90 series <br />sites, 94, 96, 97 and 98, aze located on structures owned by the Grosse-Rhode Ranch. <br />The PL series subsidence monuments have been established above the Pitkin Mesa <br />pipeline. <br />A number of high-resolution, closely spaced subsidence monuments have been installed <br />in sites selected throughout the existing permit azea. Monitoring stations No. 201 <br />through No. 224 are installed above projected fault traces in an attempt to discern the <br />effects of differential subsidence between alternating fault blocks. Stations No. 42 <br />through No. 51 are located in azeas of thick overburden. Stations No. 28 through 41, in <br />contrast, have been installed above overburden thicknesses considered typical <br />throughout the permit azea. <br />The high-resolution subsidence data will be used to evaluate and further define the <br />projected angle of draw. Data collected from these monument grids will allow <br />verification, or support redesign, of the subsidence control plans proposed by the <br />operator for implementation in the future. <br />On May 10, 1996, the West Mine experienced a large bounce in Panel 2 Right. The <br />pillaring plan at that time was subsequently revoked by the Mine Safety and Health <br />Administration (MSHA). A modified plan, allowing only the mining of bottom coal in <br />certain areas, was approved by MSHA. <br />44 <br />