2016-01-27_HYDROLOGY - C1981008

• Permit No: C1981008
• IBM Index Class Name: Hydrology
• Doc Date: 1/27/2016
• Doc Name: December 2015 DMRS ‎(CO-0000213)‎
• From: Tri-State Generation and Transmission Association, Inc
• To: DRMS
• Permit Index Doc Type: DMR’s
• Email Name: BFB
• Email Name: DIH
• Media Type: D
• Archive: No

Client: Western Fuels CO -0000213 SCG Project No.: 315565.B
Site: New Horizon Mine 013
WET TEST REPORT FORM — CHRONIC
Permittee: Western Fuels Colorado Outfall: 013
Permit No.: CO -0000213
Test Type: Routine ® Accelerated ❑
Test Species: Fathead minnow IWC: 100%
Test Start Test End
Time Test Start Date Time Test End Date
1700 08-18-2015 1630 08-25-2015
Test Results
Lethality
Growth
NOEC
100%
100%
100%
PASS
PASS
IC25
>100%
>100%
100
PASS
PASS
Dilntionkl - % Effluent
Measurements
Control
0%
20%
40%
60%
80%
100%
% Survival for day 1
100
100
100
100
100
100
% Survival for day 2
100
100
100
100
100
100
% Survival for day 3
100
100
100
100
100
100
% Survival for day 4
100
100
100
100
100
100
% Survival for day 5
100
100
100
100
100
100
% Survival for day 6
100
100
100
100
100
100
% Survival for day 7
98
100
100
98
100
100
Mean Dry Wt, m
0.262
0.302
0.287
0.299
0.300
0.276
Hardness (mg/L) Receiving Water: N/A Effluent: 1630/151711436 Recon Water: 88
Alkalinity (mg/L) — Receiving Water: N/A Effluent: 317/356/299 Recon Water: 58
Chlorine (mg/L) — Effluent: <0.01 pH (initial/final) — Control: 8.2/7.8 100%: 6.9/8.0
Total Ammonia as NH3 (mg/L) — Effluent: 1.62/1.41/1.46
Were all Test Conditions in Conformance with Division Guidelines? YES ® NO ❑
If NO, list deviations from test specifications:
Laboratory: SeaCrest Group
Comments:
Analyst's Name: Alex Arnold, Ashley Bruhn, and Amanda Shephard
Date a? /S
SeaCrest Group 26