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MINREC, INC., BLUE RIBBON MINE <br />1990 HYDROLOGIC REPORT <br />JANUARY 1, 1990 THROUGH DECEMBER 31, 1990 <br />INTRODUCTION <br />The Blue Ribbon Mine went into permanent cessation in 19811 and <br />the ma.iority of reclamation was completed that year. A minor <br />amount of Qrading was done in 1981 on the portal bench to improve <br />drainage. During both 1988 and 1989 portions of the bench cover <br />material slumped and Caere repaired and seeded. <br />The hydrologic monitoring plan is contained in the permit docu- <br />ment, paKes 1'Ld and 1'2~4a which were revised May 14, 1990 and Oc- <br />tober 8. 1990 respectively-. Exhibit H-1 and Z show the various <br />monitoring locations. <br />SURFACE WATER <br />The follocaine table shows the flow, pH and conductivity for <br />upstream and dos:nstream Hubbard Creek by quarter for 1990 com- <br />pared to the same month averages from 1982 through 1989. <br />Upper Hubbard Creek Lower Hubbard Creek <br />t~uarter Parameter Ave 1990 Ave 1990 <br />1st F1oi: 'L5.2 5.0 - - <br /> pH 8.1 7.9 8.0 8.i <br /> Cond li5 250 20"r 25U <br />2nd Flow 39.3 3.5 - - <br /> pH 8.3 8.2 8.1 8.5 <br /> Cond 190 190 '~03 190 <br />:3rd Flog: 8.3 'L .0 - - <br /> pH 8.1 8.i 8.3 8.b <br /> Cond 252 =120 L60 380 <br />{th Flow 9.i 1.0 - - <br /> pH 8.2 8. i 8.~1 8.'L <br /> Cond 190 200 2l ~ ~k'l0 <br />.According to the local irri~2ation office. 1990 was a below <br />average year t'or run-off. The table shozas the lower than average <br />flora. <br />There pass virtuall>• no snow on the ground at the beginning of the <br />year. For this reason none of the sedimentation ponds had any <br />discharge during the .rear. <br />-1- <br />