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III IIIIIIIIIIIIIIII <br />999 <br />STATE OF COLORADO <br />~7 <br />• <br /> <br />Roy Romer, Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Director <br />T0: Susan Mowry ~`, -~,~-~~ <br />I \ <br />FROM: Jim Pendleton ~~ <br />RE: Blue R n Bench ility Monitoring Results <br />DATE: July 19, 1988 <br />I have reviewed the letter monitoring report submitted to you by Jim Stover, <br />Chief Engineer for Blue Ribbon Coal Company. This report presents the slope <br />stability survey results for the seven monuments placed on the face of the <br />rebuilt and reclaimed mine bench at the Blue Ribbon mine. The data suggest <br />that all the stability monuments have risen between .03 and .24 feet. This is <br />probably due to a minor inaccuracy in bringing in control from the benchmark <br />monument. The relationship between the monuments is similar to previous <br />surveys. Therefore, I conclude that the bench is structurally stable. <br />I recommend that you accept the survey results as submitted. I suggest that <br />you bring the apparent inaccuracy to the operator's attention and suggest that <br />they attempt to determine the source of the inaccuracy during their next <br />nromal slope stability monitoring survey. <br />215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />