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<br />POWDERHORN <br />COAL COMPANY <br />October 29, 1996 <br />e'i:`,:~~5`i~~~ <br />iii iiiiiiiiiiiii iii <br />sss <br />P O. Box 1430 <br />~~~~ (970)a469-7961ado 61526 <br />Fax (970)464-7181 <br />@{t{s;et~ cf :1:;n~rals 8 Gaolog~ <br />@+rshd Junction <br />Mr. Dan Mathews <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />2148 Broadway, #C-5 <br />Grand Junction, CO 81503 <br />Re: Subsidence Monument Survey 11 & 13, C-81-041 <br />Dear Mr. Mathews: <br />This is to verify that the 5 subsidence monitoring points <br />installed in Coal Canyon and Jerry Creek have been surveyed. The <br />survey was conducted on October 8 & 9, 1996. The attached <br />diagram shows the installed location (red circle) and the <br />location shown of Exhibit 56 (Black Circle). The original <br />locations had no specific significance and were primarily moved <br />to allow observation from one central point as designed. <br />Although mining had taken place close to SM02 prior to <br />installation, we do not believe any subsidence related to mining <br />had occurred. That area of the mine was still accessible a week <br />before the survey and with no evidence of caving which could <br />cause subsidence. The following is a list of coordinates and <br />elevations of the points; <br />Base - 1,021,131.82'N 104,358.55'E 5164. 00' <br />SMOl - 1,022,251.71'N 107,868.15'E 4868 .81' <br />SMOl - 1,021,954.58'N 105,246.28'E 4898 .44' <br />SMOl - 1,023,150.24'N 101,689.75'E 4.970 .17' <br />SMOl - 1,020,533.47'N 103,268.01'E 4985 .44' <br />SMOS - 1,018,495.90'N 100,993.03'E 5120 .97' <br />Please let me know if you have ary further questions. <br />Sincerely, <br />i ~. <br />r _ ~ <br />~/ <br />Larr Reschke <br />En neer <br />LMR:lmr <br />Enclosure <br />