HYDRO26083

• Permit No: C1981010
• IBM Index Class Name: Hydrology
• Doc Date: 1/30/2003
• Doc Name: 4th Quarte 2002 DMR ‎(CO0032115)‎
• From: Trapper Mining Inc
• To: WQCD
• Permit Index Doc Type: DMR’s
• Media Type: D
• Archive: No

TRAPPER MINING INC.
C-~c~ ---o~a
January 24, 2003
CERTIFIED #7099 3220 0003 0832 0844
RECEI~/E®
JAN 3 D 2003
Ms. Cazla Lenkey
Colorado Department of Public Health and Envvonment Division of Minerals and Deology
WQCD-PE-B2
4300 Cherry Creek Dr. South
Denver, CO 80222-1530
SubjeM: Fourth Qusrter 2002 Colorado Wastewater Discharge Mouitoriug Reports,
Perwit No. CO-0032115
Dear Ms. Lenkey:
Enclosed are Trapper Mine's Fourth Quarter 2002 Colorado Wastewater Discharge Monitoring Reports for the
period 10/01/02 -12/31/02. During this quarter, two NPDES outfalls were active. Outfa11001 discharged from the
last week in November through December. Outfall 002 discharged routinely throughout the quarter. Outfalls 003,
005, 006, 008, 009, 010, 011, 012, 013, 014, 015, 016, 017, 018, 019, 021 and 023 did not dischazge during the
quarter. Outfalls 022 and 024 are associated will[ sedunent ponds that have not yet been constructed. No discharges
are reported for these outfalls. Values reported on the enclosed DMRs represent the maximum (or minimum as
applicable) monthly/daily values generated at each outfall during the quarter.
Also enclosed are monthly NOAA weather summaries for the reporting period, seep volume data for site 011, and
WET test report forms as applicable. Outfa11001 was sampled for two species acute WET analyses during the
quarter. A single species acute test (P. promelas) was completed at outfa11002 in August of 2002. Results for these
two outfall WET tests aze included with this report. No exceedences of WET test limitations were observed at any
tested outfalls during the applicable reporting periods.
Two exceedences of primary effluent limitation occurred during the quarter; however, the altemate limitations were
applicable in this case as the exceedences were solely attributable to nmoff stemming from precipitation/snowmelt
events. The sedimrnt pond discharging to the outfall was properly maintained and operated. At outfa11002, the
primary thirty-0ay average limitations and daily maximum for TSS were exceeded by a sample collected at 9:30 a.m.
on 12/03/02 (94 mg/1 TSS). The alternate daily maximum 1mtitation for settleable solids, applicable in the event of
discharge caused by precipitation (or snowmelt) less than or equal to the 10-year, 24-hour precipitation event was
met. A subsequent sample taken on 1280/02, when temperatures moderated a[ or below the freezing point, indicated
a TSS of 6 mg/1 which is well within established limits.
Temperature records on the enclosed monthly NOAH weather summary for December indicate that during early
December, snowmelUfreezing was occurring on a daily basis. Temperature high's in the high 40's with low's in the
mid teens were recorded. Daily weather observations are recorded at 7:00 a.m. The sample from outfal1002 was
collected at 9:30 a.m. on 12/03/02. Three inches of fresh snow was received on November 25 which contributed to
the runoff event. This demonstrates that the temperature differentials/snowfall occurring and the resulting snowmelt
experienced during the sampling cycle were the sole cause of the exceedences.
Trapper is required to maintain sediment levels in ponds at or below 60% of the pond volume. The ponds
contributing to outfall 002 all contained sediment levels well below this limit at the time the exceedences occurred.
The exceedences occurred solely in response to a discharge caused by precipitation and/or snowmelt therefore, the
P.O. Box 187 Craig, Colorado 81626 [phone]