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MINREC, INC. 2768 COMPASS DRZVE, SUITE 101 GRAND JUNCTION, COLORADO 81506 PRONE: (303) 245-4101, FAR 242-7908 RED CANYON MINES January 28, 1994 i' F-' i C. E. Johnston ~n.rd 31 1°34 Division of Minerals and Geology 1313 Sherman St., Room 215 - .__,~„~,_„ Denver, CO 80203 Re: Annual Hydrologic Reports Permit C-81-034 Dear Ms. Johnston: The Divisions letter dated December 13, 1993, transmitted its comments on Minrec's 1992 and 1993, Red Canyon Mine, Annual Hydrologic Reports. Following are Minrec's responses to those comments Surface Water The Division noted that the conductivity measurements taken during September on Ward Creek, increase significantly from the upstream to the downstream sampling point. I do not believe the available monitoring data supports this observation. Enclosed is a table titled Ward Creek Late Season Flows. This table shows, for the period of record 1982 - 1993, the average increase in conductivity between the upstream and downstream monitoring points is 159 umhos/cm. The comparable increase in the conductivity measurement for both 1992 and 1993 is 150 umhos/cm which is actually just below the historic average increase. Also enclosed is a graph of the conductivity measurements for upstream and downstream Ward Creek taken during from 1982 through 1993. This graph supports the conclusion that the conductivity in lower Ward Creek is following historic trends. Minrec will continue monitoring Spring 1 and Spring 3 to observe whether the conductivity continues to increase. It should be noted that both Spring 1 and Spring 3 have recorded historic high conductivity measurements when they were also exhibiting historic high flows. The historic high for Spring 1 occurred May 26, 1983; 990 umhos/cm at 35 gpm. The historic high for Spring 3 occurred September 18, 1993; 750 umhos/cm at 6 gpm. Minrec will continue to monitor Ward Creek in accordance with permit requirements. However, there is no indication the