2021-04-29_REPORT - C1981010

• Permit No: C1981010
• IBM Index Class Name: Report
• Doc Date: 4/29/2021
• From: DRMS
• To: Trapper Mining Inc
• Annual Report Year: 2019
• Permit Index Doc Type: Hydrology Report
• Email Name: RAR
• Email Name: JLE
• Media Type: D
• Archive: No

Requirement Regulation Reviewed Comment
J. Sampling Table 4.8-11
of CDRMS
frequency at Trapper conducted surface monitoring in accordance with
surface water mining Yes the approved monitoring plan and frequency.
monitoring sites permit C-81-
010
K. Parameters to be Table 4.8-12
of CDRMS
sampled at
mining Yes
surface water
sites permit C-81-
010
Upon completion of mining,Trapper's pond network will
be used for watering livestock and wildlife. To evaluate
the suitability of Trapper's surface water for those uses a
comparison of surface water data as per the AHR to water
quality standards of CWQCC Regulations 31 and 37 for
stream segment 3b is made. Regulation 37s classifications
L. Prevention of for stream segment 3b include Aquatic Life (warm 2),
impacts to Recreation(P), and Agriculture. The State of Colorado
surface water CDRMS defines the agricultural use classification as water suitable
adversely regulation Comment for irrigation and stock watering,assuming that water safe
impacting the 4.05.1(2) for livestock and aquatic life is also safe for wildlife.
postmining land Also,certain constituents monitored have effluent
use limitations standards requirements as per Trapper's
NPDES permit,discussed above in in sections E and G.
Water quality was measured at the downstream discharge
points in drainages near the northern permit boundary.
Water quality at these locations is assumed to be repre-
sentative of water quality higher in the watersheds. No
exceedances of standards occurred in 2019.
M. Filing frequency CDRMS
of pond reports regulation Yes Filing frequency was met.
4.05.9(17)
N. Timely filing of CDRMS
pond reports regulation Yes Filing of reports was timely
4.05. 9(17)
O. Content of pond CDRMS
reports regulation Yes
4.05. 9(17)
• Groundwater elevation data was not submitted for
wells P-5,GLEV-2 and GP-7 because these
locations were dry during third quarter
P. Sampling Table 4.8-13a monitoring. GP-7 has been dry since mid-2018,
frequency of of CDRMS GLEV-2 has been dry since it was first monitored
groundwater mining Comment in January 2015, and P-5 was dry during the last 2
monitoring wells permit C-81- quarters of monitoring of 2019. P-5 historically
O10 goes dry.
• Because P-5 was dry during the third quarter of
2019 a List B sample could not be collected and
sulfate is part of the List B suite of analytes.
Page 2