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MINREC, INC., BLUE RIBBON MINE <br />1991 HYDROLOGIC REPORT <br />JANUARY 1, 1991 THROUGH DECEMBER 31, 1991 <br />INTRODUCTION <br />The Blue Ribbon Mine went into permanent cessation in 1986 and the <br />majority of reclamation was completed that year. A minor amount of <br />grading was done in 1987 on the portal bench to improve drainage. <br />During both 1988 and 1989 portions of the bench cover material <br />slumped and were repaired and seeded. <br />The hydrologic monitoring plan is contained in the permit document, <br />pages 124 and 124a which were revised May 14, 1990 and October 8, <br />1990 respectively. Exhibit H-1 and Z show the various monitoring <br />locations. <br />SURFACE WATER <br />The following table shows the flow, pH and conductivity for <br />upstream and downstream Hubbard Creek by quarter for 1991 compared <br />to the same month averages from 1982 through 1990. <br />Uaper Hubbard Creek Lower Hubbard Creek <br />Quarter Parameter Ave 1991 Ave 1991 <br />1st Flow 22.3 9.0 - - <br /> pH 8.1 8.6 8.1 8.2 <br /> Cond 185 220 212 250 <br />2nd Flow 35.0 3.0 - - <br /> pH 6.3 6.4 8.4 8.0 <br /> Cond 190 330 201 350 <br />3rd Flow 8.0 3.0 - - <br /> pH 8.2 8.2 8.3 7.6 <br /> Cond 271 190 273 330 <br />4th Flow 8.0 2.5 - - <br /> pH 8.3 7.9 8.3 7.7 <br /> Cond 191 200 237 260 <br />According to the local irrigation office, 1991 was a below average <br />year for run-off. However, the 1991 water year produced more run- <br />off than the three prior years. The above table shows the lower <br />than average flow for Hubbard Creek for all four quarters. <br />None of the sedimentation ponds had any discharge during the year. <br />-1- <br />