REP19035

• Permit No: C1981025
• IBM Index Class Name: Report
• Doc Date: 12/11/2001
• Doc Name: 2000 ANNUAL HYDROLOGY REPORT
• Annual Report Year: 2000
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

•
MINREC, 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
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
Pimephales 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 (2nd and 4`h quarters) during the
year using C. dubia and Pimephales promelas, fathead minnow. A single species chronic
bioassay was performed two times (15' and 3`d 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.