PERMFILE114490

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 5/17/2004
• Doc Name: p. C-94 to C-179
• To: DMG
• Section_Exhibit Name: Appendix W 2003 Report Section 2.5 Appendix C Part 2
• Media Type: D
• Archive: No

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Narrative and Discussion
PERMIT AND SAMPLE INFORMATION
NPDES permit #:
Type of sample:
Date and time of sample(s):
Date and time of test start:
Dilution water:
Receiving temperature(s}:
ADDRESS ALL CORRESPONDENCETO:
COMMERCIAL TESTING 8 ENGINEERING CO.
4665 PARIS STREET, SUITE 8-200
DENVER, CO 80238
TEL: [phone]
FAX: [phone]
CO-0032115
Effluent Grab
07/21 /03 0900
07/22/03 1305
Reconstituted Laboratory Water
16.0 ° C
TEST ORGANISMS
Fathead minnow Age: 6 days
Ceriodaphnia dubia Age: <24 hrs
. PROCEDURE
• Acute, 48 and 96-hour bioassays as outlined in the most recent protocols specified by the Water
Quality Control Division of the Colorado Department of Health (1998).
• DISCUSSION
According to the Trapper Mining Inc. discharge permit (CO-0032115), an acute WET test is failed
whenever the LC6G, which represents an estimate of the effluent concentration which is lethal to
50% of the lest organisms in the time period prescribed by the test, is sound to be less than or
equal to 100% effluent.
By this definition, the results of this bioassay indicate that effluent from outfall 020 is not acutely
toxic to fathead minnow and Ceriodaphnia dubia survival. Therefore, outfall 020 is in compliance
with the acute WET portion of its Colorado State Discharge Permit for the third quarter of 2003.
DATE OF REPORT
July 27, 2003
ReCp~ort_ prepared by: Sarah Lohner
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Laboratory Technician Date
Report reviewed by' Michelle Cox
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Laboratory Technician Date
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Comma¢iEi iasnnc 8~ Er,ar~eanne La I Minerals Service: -Corporate Oftice
11919 S. Highland Ave., Suite 2106, Lombard, IL 6014E t 16301953-9300 t 16301953-9306 v/wwsgs.com
MemEei of the SGS G(nYO lSOCipte Generale de Surveiliancel