2008-10-31_HYDROLOGY - C1981010

• Permit No: C1981010
• IBM Index Class Name: HYDROLOGY
• Doc Date: 10/31/2008
• Doc Name: 3rd Quarter 2008 DMRS ‎(CO-0032115)‎
• From: Trapper Mining Inc
• To: WQCD
• Permit Index Doc Type: DMR’s
• Email Name: JDM
• Media Type: D
• Archive: No

TRAPPER MINIM sec.
October 21, 2008
CERTIFIED
RECEIVED
Ms. Carla Lenkey OCT 31 2008
Colorado Department of Public Health and Environment
WQCD-PE-B2 Division of Reclamation,
4300 Cherry Creek Dr. South Mining and Safety
Denver, CO 80222-1530
Subject: Third Quarter 2008 Colorado Wastewater Discharge Monitoring Reports
Permit No. CO4W2115
Dear Ms. Lenkey:
Enclosed are Trapper Mine's Third Quarter 2008 Colorado Wastewater Discharge Monitoring Reports for the
period 07/1/08-09/30/08. During this quarter, five NPDES outfalls were active. Outfalls 002 and 020
discharged routinely throughout the quarter. Outfalls 001 and 011 discharged during the first two weeks of the
quarter. Outfall 018 discharged in response to dewatering of the pond for expansion of the reservoir. Outfalls
005, 008, 009, 012, 013, 014, 015, 016, 017, 019, 021, 022, 023 and 024 did not discharge during the quarter.
Values reported on the enclosed DMRs represent the maximum (or minimum as applicable) monthly/daily
values generated at each outfall during the quarter.
Outfall 018 exceeded primary effluent limitations for Total Suspended Solids. The value recorded on July 8'
was 55mg/l. Previous to this outfall being sampled the sediment pond was being pumped out by a high flow
waste pump. The reservoir was enlarged this summer and the pool needed to be emptied and allowed to dry
before operations could commence. The overall reservoir was enlarged by deepening the pond and raising the
embankment several inches. During the pumping process sediment was disturbed from the bottom of the pool
and pumped out of the pond. In this particular outfall a small preexisting stock pond lies below the sediment
structure. Water passes through this small depression before passing through the monitoring point. Below the
parshall flume that is considered the monitoring point lies a grassy swale consisting of upland grass species and
scattered sage brush in the drainage way. Trapper's permit boundary lies approximately 2000 feet downstream
of the discharge point. No pumped water left the permit area, and no visible sediment was deposited
downstream of the pond. A small pool of water remained after pumping. This remaining pool was tested for
TSS and a recorded level of 8mg/l was found to be well within the limitations of the discharge permit. This one
time event had no impact downstream of the discharge point and was not an intentional exceedance of the
limitations. No other exceedances of primary effluent limitations were recorded during the quarter.
Also enclosed are monthly NOAA weather summaries for the reporting period and WET test report forms as
applicable. Two outfalls were sampled for WET analyses during the quarter. Two species acute tests were
completed at outfalls 011 and 020. No exceedances of WET test limitations were observed at the tested outfalls.
Trapper is required to maintain sediment levels in ponds at or below 60% of the pond volume. All outfalls have
been properly maintained and no ponds exceeded the 60% threshold for sediment accumulation. All structures
operated properly and were not compromised in any way. All other operations were properly conducted
concerning the sediment control structures at Trapper Mine.
P.O. Box 187 Craig, Colorado 81626 [phone]