2015-07-24_HYDROLOGY - C1981008

• Permit No: C1981008
• IBM Index Class Name: Hydrology
• Doc Date: 7/24/2015
• Doc Name: Discharge Monitoring Report - WET Testing
• From: Tri-State Generation and Transmission Association, Inc
• To: DRMS
• Permit Index Doc Type: NPDES
• Email Name: BFB
• Email Name: DIH
• Media Type: D
• Archive: No

Client: Western Fuels CO -0000213 SCG Project No.: 315391.6
Site: New Horizon Mine 007
WET TEST REPORT FORM — CHRONIC
Permittee: Western Fuels Colorado Outfall: 007
Permit No.: CO -0000213
Test Type: Routine ® Accelerated ❑
Test Species: Ceriodaphnia dubia IWC: 100%
Test Start Test End
Time Test Start Date Time Test End Date
1350 06-23-2015 1300 06-29-2015
Test Results
Lethality Reproduction
NOEC
100% 20%
60%
PASS FAIL
IC25
>100% 50.1%
100
PASS FAIL
Dilution(s) - % 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
1 100
100
90
t00
100
% Survival for day 6
100
100
100
90
100
80
Mean 3 Brood Total
27.7
23.8
22.8
18.8
1 17.7
13.7
Hardness (mg/L) -- Receiving Water: NIA Effluent: 225/231/243 Recon Water: 88
Alkalinity (mg/L) — Receiving Water: N/A Effluent: 194/136/145 Recon Water: 62
Chlorine (mg/L) — Effluent: <0.01 pH (initial/final) — Control: 8.0/8.0 100%:8.1/8.4
Total Ammonia as NH3 (mg/L) - Effluent: <0.03
Were all Test Conditions in Conformance with Division Guidelines? YES M NO ❑
If NO, list deviations from test specifications:
Laboratory: SeaCrest Group
Comments:
Analyst's Name: Alex Arnold, Kyra Brisson, and Raelynn Kadunc
SeaCrest Group 18