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-4- <br />accepted practice to establish one monitoring point (benchmark) at a <br />location which will not be affected by subsidence processes. This <br />monitoring point will provide the operator, as well as the Division, a <br />permanent reference from which to gage movement within the affect area. <br />The operator may wish to establish this fourth monitoring point <br />(permanent benchmark) in the southern portion of the permit area near <br />the year 1 and year 4 panels. <br />A diagram which depicts a recommended method of establishing subsidence <br />monitoring monuments is enclosed for the applicants use. <br />SR/ddt <br />9001E <br />