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<br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />303 8663567 <br />Fax: 303 832-8106 <br />STATE OF COLORADO <br />OF' ~~[p <br />a~i~~i'~~=~,,~^^'~~pp <br />~e1o <br />~ ra'/6 ~ <br />• <br />Ray Romer, <br />Governor <br />Fred R. Banta. <br />Division Director <br />DATE: August 3, 1990 <br />T0: Matt Hayes <br />FROM: Jim Pendleton ~ \ <br />RE: Blue Ribbon~Mine Quarterly Bench Stability & Piezometer Monitoring <br />/ June, 1990 (Permit No: C-81-047) <br />I have reviewed the to letter reports which you forwarded to nD' attention. <br />These two reports, which list the data collected during the June, 1990 <br />monitoring of the mine bench stability monuments and piezometer water levels <br />at the Blue Ribbon Mine, were prepared by James Stover, P.E., consultant to <br />the permittee. <br />The slope stability monument monitoring results demonstrate that the bench <br />continues to be structurally stable. The surficial failures of past years <br />have not occurred in 1990. The spring of 1990 was abnormally warm and dry in <br />the North Fork valley. It is hoped that this will allow the bench to gain <br />surficial stability. <br />The monitoring of the water levels in the piezometers installed on the face <br />and crest of the portal bench do not indicate any reason for increased <br />concern. The piezometers appear to be evidencing relatively consistent annual <br />fluctuations in the water levels within the bench. I do not believe there is <br />any evidence provided by these two monitoring which should cause the Division <br />to be concerned regarding the stability or hydrology of the Blue Ribbon Mine <br />bench. <br />cc: Sue McCannon <br />Doc No: 9191E <br />JP/jp <br /> <br />