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REP34600
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Last modified
8/25/2016 12:11:33 AM
Creation date
11/27/2007 6:54:01 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981025
IBM Index Class Name
Report
Doc Date
1/4/1999
Doc Name
1998 ANNUAL HYDROLOGIC REPORT
Annual Report Year
1998
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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<br /> <br /> <br /> <br /> <br /> <br /> <br />MWREC, INC. ANNUAL HYDROLOGIC REPORT PAGE 4 <br />1992 <br />--------- 19.3 <br />---------- 8.0 <br />---------- 2722 <br />---------- 1805 <br />---------- 0.72 <br />--------- <br />1993__ <br />------- --_22.4-- _---7_9-- ___2643- ___1738 0.54 <br />--------- <br />1994 21.2 7.6 2627 1710 0.52 <br />1995 32.5_- ____7_8__ -- 2435- ---1663- _--0.17- <br />1996 __36_8-- --__7_8-_ ___2082_ _--1441__ ___0.15 <br />1997 52.0 7.6 2083 1424 0.20 <br />1998 69.0 7.5 1819 1409 0.30 <br />The units for the figures in the above table are; flow (gpm), pH (standard units); <br />conductivity (umhos/cm); total dissolved solids (mg/1) and iron (mg/I). Iron was measured <br />as total recoverable until April 1994 when the Colorado Department of Public Health and <br />Environment changed the discharge permit to require iron to be measured as potentially <br />dissolved. <br />' WET TESTS <br />The discharge permit requires chronic Whole Effluent Toxicity (WET) tests to be <br />' performed on effluent from outfall 001. The discharge permit was amended during the <br />year. A iwo species chronic WET test using C. dubia and Pimeohales promelas, fathead <br />minnow, is required semi-annually during the second and fourth quarters. A single species <br />' chronic WET test using C. dubia is required semi-annually during the first and third <br />quarters. <br />t A two species chronic bioassay was performed three times (1 ~ 2"d and 4"' quarters) during <br />the year using C. dubia and Pimephales promelas, fathead minnow. A single species <br />' chronic bioassay was performed one time (3rd quarter) during the year using C. dubia. <br />Results found the effluent demonstrated no toxicity to C. dubia or fathead minnow survival <br />in any concentration less than or equal to the instream waste concentration (IWC). <br />1 <br />ANTICIPATED IMPACT <br />' Discharge from ouffall 001 may slightly impact the quality of water in North Thompson <br />Creek. The mine water discharge has a low iron content and an acceptable pH, however <br />its conductivity is quite high. A 69 gpm flow with a conductivity of 1830 discharging into <br />a receiving stream with a 5 cfs flow and a conductivity of 494 (pre-permit mean) would <br />increase the conductivity of the receiving stream to about 534 umhos/cm, an increase of <br />less than 10% which is considered insignificant. <br />1 <br />
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