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

Narrative and Discussion
ADDRESS ALL CORRESPONDENCE TO:
COMMERCIAL TESTING 8 ENGINEERING CO.
4666 PARIS STREET, SUITE 8-200
DENVER, CO 80239
TEL: [phone]
FAX: [phone]
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):
CO-0032115
Effluent Grab
04/14/03 0900
04/15/03 1215
Reconstituted Laboratory Water
8.0°C
TEST ORGANISMS
Fathead minnow Age: 14 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 LC6°, which represents an estimate of the effluent concentration which is lethal to
50% of the test organisms in the time period prescribed by the test, is found to be less than or
equal to 100% effluent.
By this definition, the results of this bioassay indicate that effluent from outfall 001 is not acutely
toxic to fathead minnow and Ceriodaphnia dubia survival. Therefore, outfall 001 is in compliance
with the acute WET portion of its Colorado State Discharge Permit for the second quarter of
2003.
DATE OF REPORT
April 20, 2003
Report prepared by: Sarah Lohner
Laboratory Technician Date
Report reviewed by: Chris Theel
Biomonitoring Supervisor Date
•
4 Comme¢r l 5estinc b Eraineennc Cc. Minerals Service= -Corporate Office
1979 S. Hiohland Ave_ Suite 2708. Comhard. IL 60148 t 16301953-9300 116301953-9306 wwwsgs.com
rsx, Memnei at the SGS Group ISOCiete Gpnerele de Surveillencel