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REP42616
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Entry Properties
Last modified
8/25/2016 12:44:32 AM
Creation date
11/27/2007 9:40:02 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981008
IBM Index Class Name
Report
Doc Date
12/11/2001
Doc Name
NUCLA NPDES PERMINT CO-0000213
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division . <br />Rationale - Page 8. Permit No. CO-0000213 <br />DISCUSSION OF PERMIT LIMITATIONS AND CONDITIONS: <br />I. Changes in Discharge Points <br />Any tine the permittee wishes to change the location of an outfall, add or <br />deactivate outfalls, or change an outfall from active to post-mining; it <br />will be necessary for the permittee to submit an amendment request. <br />J. Whole :effluent Tonicity (WET) Testing <br />No biomonitoring is required for only the surface stormwater discharge <br />points. The Discharge Permit Regulations exempt stormwater from <br />biomonitoring. However, acute biomonitoring is required for discharge <br />points 001 and 006 on the basis that they contain mine water. See Parts <br />I.A and I.B.2 through 9 of the permit for the WET testing requirements. <br />Monitoring shall be performed commencing with the first full calendar <br />quarter following the permit effective date. <br />Section 6.9.7 of the permit regulation, passed by the Water Quality Control <br />Commis::ion (WQCC), has established the use of WET testing as a method for <br />identil:ying and controlling tonic discharges from wastewater treatment <br />facilities. WET testing is being utilized as a means to ensure that there <br />are no discharges "in amounts, concentrations or combinations which are . <br />harmful. to the beneficial uses or tonic to humans, animals, plants, or <br />aquatic life" as required by Section 3.1.11 (1)(d:) of the Basic Standards <br />and Methodologies. <br />Chemical analysis of effluent has provided only a partial evaluation of the <br />potential impact a discharge could have on the receiving stream. Also, <br />chemical analysis cannot evaluate the synergistic or ant.sgonistic effect of <br />compounds. There are also compounds for which as accurate or reproducable <br />method of chemical analysis has not yet been developed, •ss well as <br />compounds which are just beginning to be evaluated for tonic effects. WET <br />testing; will provide a more comprehensive means ol: evaluaating the tonicity <br />of a discharge than could otherwise currently be accomplished. <br />As a condition of the permit, the permit tee will t>e required to conduct <br />routine monitoring for acute toxicity. Acute toxicity a:curs when there <br />is a statistically significant difference is the aiortali-:y observed, for <br />Ceriodaphnia sp. (water flea) and fathead minnows, between the control and <br />any effluent concentration. Should acute toxicity be detected in any <br />effluent concentration less than or equal to the I:nstream Waste <br />Concentration (IWC) or should a species mortality in any dilution of <br />effluent (including 100X effluent) exceed SOX, they permit tee is required <br />to conduct a series of timely tests to identify and ultimately eliminate <br />or treat the toxicant. The IWC is determined using the hollowing equation: <br />IWC [Facility Flow (FF)/(Stream Low Flow (annual.) + FFjJ R 100X . <br />Using the facility design flaw of 1.14 cfs and the acute stream low flow <br />(lE3) of 2.5 cfs for the San Miguel Raver, the IWC' for the permittee is <br />therefore 31 X, which represents a wastewater concentration of 31 <br />effluent to 69 9. dilution water. <br />
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