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MINfiEC, INC. ANNUAL HYDROLOGIC REPORT PAGE 4 OUTFACE 001 -{QUALITY Year Flow Max Flow Ave pH COND TDS IRON 1996 54.8 36.8 7.8 2082 1441 0.15 1997 107 52.0 7.6 2083 1424 0.20 1998 ---------- 160 ------------ 69.0 ----------- 7.5 ---------- 1819 ---------- 1409 ---------- 0.30 ----------- 1999 ---------- 60 ------------ 42.1 ----------- 7.5 ---------- 1613 ---------- 1408 ---------- 0.19 ---------- 2000 49.2 36.8 8.1 1924 1329 0.09 2001 30.0 25.5 8.1 1884 1376 0.09 * Flow from No. 1 Mine and No. 3 Mine combined. The units for the figures in the above table are; flow (gpm), pH {standard units); conductivity (umhos/cm); total dissolved solids (mg/I) and iron (mg/I). Iron was measured as total recoverable until April 1994 when the Colorado Department of Public Health and Environment changed the discharge permit to require iron to be measured as potentially dissolved. WET TESTS The discharge permit requires chronic W hole Effluent Toxicity (W ET) tests to be performed on effluent from outfall 001. A two species chronic WET test using C. dubia and Pirrieohales promelas, fathead minnow, is required semi-annually during the second and fourth quarters. A single species chronic WET test using C. dubia is required semi- annually during the first and third quarters. A two species chronic bioassay was performed two times (2ntl and 4'h quarters) during the year using C. dubia and Pimeohales promelas, fathead minnow. A single species chronic bioassay was performed two times (15' and 3rtl quarters) during the year using C. dubia. Results found the effluent demonstrated no toxicity to C. dubia or fathead minnow survival in any concentration less than or equal to the instream waste concentration (IWC). Discharge Monitoring Reports (DMRs) DMRs are submitted quarterly to the Colorado Department of Health and Environment with copies to the Division of Minerals and Geology and are included herein by reference.