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J. ~ STOVER & ASSOCI*ES III IIIIII'II"II'II 2768 COMPASS DRIVE, SUITE 101 sss GRAND JUNCTION, COLORADO 81506 PHONE: (303) 245-4101, FAR 242-7908 MINE ENGINEERING CIVIL ENGINEERING MINE RECLAMATION CONSTRUCTION MANAGEMENT September 6, 1993 Rr-r,~i~~r~D SEP 8 1993 S. S. Shuey Division of Minerals and Geology 1313 Sherman St., Room 215 Denver, CO 80203 U~V~.'.~vli ~I plq'GIL~p y UGC~JIIy Re: Somerset Mining Company TR-014 - Small Area Exemptions Permit C-81-022 Dear Mr. Shuey: The Division's letter dated August 3, 1993, transmitted its adequacy comments for the subject technical revision. Following are Somerset's responses to those comments: la. Drawing E8-3253 was revised to show the hoist building at the lower Hubbard Creek facilities as a small area exemption. This area was given the designation of SAE-11. lb. The Upper Hubbard Creek topsoil stockpile was modeled using the computer program Sedcad+ Version 3. The model used a grass filter to slow the velocity of the water to allow sediment deposition. The results of the modeling are presented on page B-142 and 8-149 through B-153. lc. The Bear Creek facilities lower portal area was modeled using the computer program Sedcad+ Version 3. The model used a grass filter to slow the velocity of the water to allow sediment deposition. The results of the modeling are presented on page B-143 and B-154 through B-158. ld. The old track scales area (more recently a parking area) directly north an northeast of Pond B will be graded to drain into Pond B. Drawings 5-034 and 5-035 were revised to show the inclusion of this additional area into Drainage Area B-6. This included area is small enough so that the calculated area for Drainage Area B-6 remains the same (1.4 acres). The area to the east of this regraded area is considered to be pre-law. This area was a rail grade which provided rail access to the tipple prior to the construction of the silo.