HYDRO29130

• Permit No: C1981010
• IBM Index Class Name: Hydrology
• Doc Date: 5/1/2000
• Doc Name: FIRST QUARTER 2000 COLO WASTEWATER DISCHARGE MONITORING REPORTS PN CO-0032115
• From: TRAPPER MINING INC
• To: WQCD
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

III IIIIIIIIIIIII III
999
TRAPPER MINING INC.
April 27, 2000
CERTIFIED qZ 146 677 682
RECEIVED
MAY O1 2000
Ms. Cazla Lenkey Division of Minerals & Geology
Colorado Department of Public Health and Eovironmeot
WQCD-PE-B2
4300 Cherry Creek Dr. South
Denver, CO 802 22-1 5 30
SubJect: First Quarter 2000 Colorado R'astewater DLscheree Monltorlue Reports, ; .; - .... i t~2
PermltNo.C0,0032115 .... -. _; w,r~-i~ai~~%%,:'~?:-.~~~`";.
Dear Ms. I.enkey:
Enclosed aze Trapper Mine's First Quarter 2000 Colorado Wastewater Dischazge Monitoring Reports for the
period Ol/1/00 - 03/31/00. During this quarter, three NPDES outfalls were active. Outfalls 001 and 002
discharged routinely throughout the quarter. Outfa11011 discharged sporadically during the quaver in response to a
precipitatioNsnowmelt event in January and snowmelt in late February. Outfalls 003, 005, 006, 008, 009, 010,
012, 013, 014, 015, 016, 017, 019, and 020 did not discharge during the quarter. Outfall 018 is associated with a
sediment pond that has not yet been constructed. No discharge is reported for this outfall. Values reported on the
enclosed DMRs represent the maximum (or minimum as applicable) monthly/daily values generated at each ou[fall
during the quaver.
Also enclosed are monthly NOAA weather sr~~„ma.;es for the reporting period, seep volume data for site 011, and
WET test report forms as applicable. Three outfalls were sampled for WET analyses during the quarter. Two
species acute tests were completed at outfalls OOl and 011 during the first quarter and a single species acute test
(P. pmmelas) was completed at outfall 002 in January. No exceedences of WET test limitations were observed at
any tested outfalls. The results for outfa11002 WET will be formally reported with the next quarter's DMR
submittal as the applicable reporting period for this test at this outfall continues through June.
Two exceedences of primary effluent limitations occurred during the quazter, however, in both instances, alternate
limitations aze applicable as the exceedences were attributable to precipitation events and/or snowmelt. At outfall
002, the primary thirty-day average limitation for TSS was exceeded by a sample collected 01/18/00 (SS mg/1). Ai
outfa1101 1, the primary thirty-day average limitation for TSS was exceeded by a sample collected 02/23/00 (66
mg/I). In both instances, the alternate daily maximttm limitation for settleable solids applicable in the event of
discharge caused by precipitation (or snowmelt) less than or equal to the IO-year, 24hour precipi[ation event was
met.
As noted on the enclosed montlily NOAA weather summary for January, precipitation in the amount of 0.03" was
recorded on January OI/18/00 with 0.30" recorded on 01/19/00. Intermittent twin occurred on the OI/18/00.
Daily precipitation measurements are recorded at 7:30 a.m.. The sample was collected at 1:00 p.m. on 01/18/00.
This information demonstrates this discharge was sampled within 48 hours of measurable precipitation. As noted
on the enclosed monthly NOAA weather summary for January, temperatures above freezing were documented
during this period indicating snowmel[ was active. As noted on the enclosed monthly NOAA weather summary
for February, temperamres above freezing were also documented on and prior to the 23rd of February when the
exceedence at outfa11011 occurred. Snowmelt was active during this period as well. Tltis is further substantiated
by the documented observations of a DMG iaspector on site Febrttary 23 (see CDMG .Coal Inspection Report for
February, 2000). These exceedences occurred solely in response to precipitation and/or snowmelt and therefore,
P.O. Box 187 Craig, Colorado 81626 [phone]