REP43770

• Permit No: C1981025
• IBM Index Class Name: Report
• Doc Date: 1/9/2004
• Doc Name: 2003 Annual Hydrology Report
• From: Minrec Inc
• To: DMG
• Annual Report Year: 2003
• 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
---------- 107.0
------------ 52.0
----------- 7.6
---------- 2083
---------- 1424
---------- 0.20
----------
1998
---------- 160.0
------------ 69.0
----------- 7.5
---------- 1819
---------- 1409
---------- 0.30
----------
1999
---------- 60:0
------------ 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
2002 25.0 22.4 7.9 1907 1388 0.07
2003 22.0 17.2 8.2 1944 1346 0.03
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.
SPECIAL ANALYSIS
None during 2003
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 (2"d and 4"'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).