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... -. -~ III IIIIIIIIIIIIIIII P Q~ 999 RAYE & ASSOCIATES 976 WELCH COURT • GOLDEN. COLORADO 80401 • 13031 986-4916 March 14, 1988 M~~ 1 G ~~9~ MINED LAND Ms. Karen A. Hellner RECLAMATION DIVISION Reclamation Specialist Colorado Mined Land Reclamation Division 1313 Sherman Street Denver, CO 80203-2273 RE: MID TERM REVIEW, GRASSY GAP MINE, FILE N0. C-81-099 Dear Karen: This letter is in response to your letter dated February 10, 1988, to Bob Sherman. I have talked to Bob several times regarding data to ans- wer the questions posed in your letter. [de have not found some of the information to date, but have responded to each of your questions. Re- sponses follow the outline of your letter. 3. Chapter III - Operations Plan The Rockcastle Company will perform vegetation sampling this June in support of requesting bond release on Pits 1 and 2 by June 30, 1988. Therefore, calculations on the temporary ditches have not been performed. 4. Chapter 4 - Reclamation Plan The average topsoil redistribution depth at Pit 4 will be 21 inches. The premining depth of topsoil varied from 6" to 30" according to the operator. Since some topsoil replacement will proceed contemporaneously with mining, it is expected that topsoil replacement depths will vary From 15" to 24" at Pit 4. "Significantly exceed" may have been a poor choice of words since it does not define an exact depth. However, an average premining depth of 21" existed at Pit 4 and it is hard to envision locations where topsoil replacement will not exceed 12". For purposes of an exact answer, significantly exceed should be interpreted as a minimum topsoil depth at all Pit 4 locations of 15". IV Maps The stockpiles no longer exist at any of the reclaimed areas. Enclosed are three copies of the revised Mining Plan Map with the stockpile areas deleted from areas already reclaimed. V Bonding Bob Sherman has been trying to locate cross sections he compiled of the active Pit at Pit 4 and of Pond 4. Unfortunately, during transfer of files between Steamboat, Wisconsin and Florida, Bob cannot locate leis measurements. I am traveling to Wisconsin to the headquarters office on March 18 and will try to locate them at that time.