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<br />DEPARTMENT OF NATURAL RESOURCES <br />Davitl H. Getches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />Richar0 D. Lamm <br />Governor <br />DATE: June 11, 1986 <br />T0: Jeff Deckler <br />FROM: Jim Pendleton <br />RE: "SUBSIDENCE RI <br />~~~ <br />IDE MINE, - FILE N0. C-84-063" <br />I have reviewed the above referenced report, submitted by Eastside Coal <br />Company, Inc. The statement of survey technique included within the report, <br />prepared by a Landmark Services, Inc., surveyor for the operator, satisfies my <br />earlier concerns regarding second order accuracy during the monitoring surveys. <br />The operator is reporting survey results, presenting the average northing, <br />Basting and vertical elevation of all previous surveys for each monument <br />point, the most recent survey values and the difference between the previous <br />average and most recent values. Please instruct the operator to amend their <br />survey report format to list all previous survey results for each monitoring <br />point, the most recent survey values, the cumulative difference since <br />initiation of surveying, and the difference since the previous survey. With <br />this minor report format modification the subsidence monitoring report format <br />will be acceptable. <br />cc: Michael Long <br />srs <br />1153E <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />