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iii iiiiiiiiiiiu iii <br />999 <br />STATE OF COLORADO <br />• <br />Roy Romer, Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Dlreetor <br />MEMORANDUM <br />ry 1987 <br />• <br />• <br />T0: 5usan Mowry \/ C_~`~ j, <br />FROM: Jim Pendleton ~ `~"'`~ <br />RE: Quarterly Monyt ring o Blue Ribbon Mine Bench Stability <br />I have reviewed the stability monument, piezometer water level and subdrain <br />flow monitoring results submitted by Blue Ribbon for the 4th quarter of 1986. <br />My only concern relates to the rise in the water level recorded in piezometer <br />P-1, between 9/4/86 and 10/3/86. I am concerned that this rise may be related <br />to the ponding of drainage occurring on top of the mine bench, which resulted <br />from the operator's poor reclamation grading job, last fall. Another couple <br />of quarters monitoring results should allow us to determine whether a problem <br />is developing. In any case, there is nothing they could attempt to mitigate a <br />problem until after next spring's thaw. <br />cc: Bob Liddle <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />