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III IIIIIIIIIIIII III <br />999 <br />E~~A <br />S Coal Company Seneca Coal Company <br />July 17, 1998 <br />Mr. Michael Boulay <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203-2273 <br />RE: Quarterly Sedimentation Pond Inspections - Yoast Mine <br />Dear Mr. Boulay: <br />Enclosed is the second quarter inspection reports for Ponds 010 <br />and 011 at the Yoast Mine. Conditions appeared stable and <br />acceptable. Per the Division's request, five monitoring pins <br />were set in the top of the embankment at Pond 010 and surveyed <br />on Novemebr 19, 1996 and again on March 31, 1997. These pins <br />were surveyed again on June 30 and the results of that survey <br />are as follows: <br />PIN # DBTE NORTHING F.ACTixG ELEVATION <br />1 11/19/96 -27247.960 -1627.928 6792.287 <br />1 03/31/97 -27247.975 -1627.982 6792.183 <br />1 06/30/98 -27247.9 -1627.89 6791.835 <br /> Difference = 0.452 <br />2 11/19/96 -27361.187 -1601.726 6793.750 <br />2 03/31/97 -27361.194 -1601.786 6793.660 <br />2 06/30/98 -27361.1 -1601.6 6793.349 <br /> Difference = 0.401 <br />3 11/19/96 -27432.469 -1585.150 6793.923 <br />3 03/31/97 -27432.432 -1585.208 6793.857 <br />3 06/30/98 -27432.4 -1585.05 6793.502 <br /> Difference = 0.421 <br />4 11/19/96 -27524.247 -1564.068 6793.564 <br />4 03/31/97 -27524.193 -1564.210 6793.552 <br />4 06/30/98 -27524.2 -1564.03 6793.197 <br /> Difference = 0.367 <br />5 11/19/96 -27636.444 -1538.239 6793.238 <br />5 03/31/97 -27636.429 -1538.329 6793.084 <br />5 06/30/98 -27636.4 -1538.2 6792.855 <br /> Difference = 0.383 <br />Seneca Coal Company • P.O. Drawer D • Hayden, Colorado 61639 <br />Telephone (970) 2763707 • FAX (970) 2763014 <br />