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effectively employed and have been successful in areas of the <br />eastern portion of the Onited States. Locations of the <br />( mitigating measures can only be estimated based on theoretical <br />prediction at this time. The monitoring plan that will be <br />conducted at the Dorchester mine will enable a more accurate <br />prediction of the location of extension/compressive strains, <br />which will allow areas of mitigation to be located. Dorchester <br />will work closely with the Southern Colorado Power District in <br />evaluating data and locating and conducting the mitigating <br />measures to meet the requirements of the Southern Colorado Power <br />District and to prevent any material damage or diminution of <br />reasonable foreseeable use. <br />3.5 ~orence City Water Line <br />The Florence Watez line is currently a somewhat unreliable <br />and antiquated structure as described in Section 2.6.6. As a <br />result of the ongoing nature of leaks and disruption of flow in <br />the line, a clear delineation of possible additional damage <br />specifically caused by Dorchester's activities will be difficult, <br />if not impossible. In addition, Florence officials are currently <br />assessing alternative strategies to replace the present line with <br />a modern, reliable system. Consequently any monitoring and <br />mitigation requirements must recognize both the present condition <br />of the line, as well as its uncertain future. Nevertheless, <br />Dorchester recognizes its obligation under RDLE 2-05.6(6)(f) to <br />develop and implement a subsidence control plan to mitigate <br />damage clearly caused by Dorchester's operations. Dorchester has <br />discussed its plans with Florence officials (2/3/83) and has <br />• developed the following approach on the basis of mutual <br />28 <br />