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_2_ DRAFT <br />A recent subsidence event has been monitored and analyzed within the <br />second and third east panels of the Roadside mine, immediately adjoining <br />the Cottonwood lease on the north side. This recorded and analyzed <br />event has demonstrated that the design characteristics utilized in <br />completing the proposed plan for subsidence control have functioned as <br />projected within the area of the second and third east panels of the <br />Roadside mine. <br />As a portion of its subsidence control plan, Powderhorn Coal Company, <br />has proposed the installation and monitoring of a subsidence monitoring <br />network developed to determine the commencement and magnitude of subsidence <br />movements. Subsidence monitoring networks have been established above <br />the second and third east room and pillar panels at the Roadside mine <br />during previous permitted mining activitu. Monitoring of these subsidence <br />monuments networks will be continued during the pro nosed underground <br />mining. In addition, the applicant has installed subsidence monuments <br />along the centerline of the Ute water pipeline. Monitoring of the installed <br />subsidence monuments will begin once mining commences in any area being <br />monitored and will continue beyond the cessation of mining for a period <br />of time necessary to determine the magnitude and other critical aspects of <br />the subsidence. Cessation of monitoring will occur upon written approval <br />of the Division. In addition, the raw water water collection pipelines <br />will be monitored on a regular basis during mining to ensure that subsidence <br />effects, which could be potentially damaging to the pipelines, are detected <br />in time to prevent the cessation of service. The subsidence control plan, <br />as presented by Powderhorn Coal Company within the amended application <br />documents, is found to be in compliance with the subsidence-related regulations <br />of Rules 2.05.6(6) and 4.20. <br />