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~, <br />iii iiiiiiiiniu iii <br />STATE OF COLUI~llU_ <br />Roy Romer, Govei <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Director <br />DATE: September 8, 1989 <br />T0: Bill Crick <br />FROM: Jim Pendleton ~ ~~~--~~~ <br />RE: East side - e Pe Renewal -Subsidence Monitoring Frequency <br />(Permit #C-84-063) <br />It appears I completed the same review at Harry Ranney's request in July of <br />this year. The good labs provide the same results for both portions of the <br />split sample: <br />The second half of the final paragraph of my original memorandum speaks to <br />your concern. I don't believe the monitoring frequency should be reduced <br />below semi-annually. I allowed the monitoring frequency to be reduced durino <br />cessation, because it was prudent to assume very low probability of newly <br />initiated subsidence manifestation. No subsidence had occurred to date and no <br />additional underground disturbance would occur durino the cessation. <br />attachment <br />cc: Jim Stevens <br />215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203.2273 Tel. (303) 866-3567 <br />