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i iiii i i niiiiii i i i i DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1317 Sherman 51., Room _' I S Denver, CO 80203 Phone: i303~ 866-3567 FAa: 1303) 832-8106 May 14, 1993 TO: Janet Binns ~ ;; .~ . FM: Shawn Smith ~'~ ~" ~_~ Re: Subsidence Issues and Monitoring at Roadside (C-81-041) Dear Janet: OF'CO[O ti~ 4 '~ n /B i6 Rov Romer Governor siichael 8. Long Drvisron Direnor I have consulted with our resident expert, Mr. Jim Pendelton regarding our discussion and concern on the cessation of monitoring at the Roadside mine operation. I conclude the following: The past monitoring has been sufficient over the old workings 'area and Ute•WaZerline. These two monitoring programs were dropped in TR03 and TR08 respectively. Further monitoring proceede on the south mains until 1985. Temporary cessation status discontinued monitoring of the monuments. Last subsidence report received was in December of 1985. TC status lasted until April 30, 1989. A letter from Mike Savage to Larry Reschke (see attached) re- activated "any monitoring" previously approved to be terminated due to the TC status. Mr. Pendelton and myself conclude that further monitoring of the current A,C and L lines is unnecessary due to the direction of mining to the south. Undermining the old workings and any structures has already been monitored and recorded sufficiently for the area. The next five year permit term does not undermine any drainage or surface structure to my knowledge, therefore, since the geology and overburden thickness remain essentially the same, as does the coal seam thickness, additional placement of monitors is unnecessary. I would request, however that the mine operator perform the following tasks, which can be written. into the findings as a stipulation if necessary. STATE OF COLORADO