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Aqua-Tox, Inc. <br />4880 Robb Street, Suite 8 <br />Wheat Ridge, CO 80033 <br />(303) 621-4880 aqua-tox.com <br />ACUTE TOXICITY REPORT <br />Pimephales promelas - Fathead Minnow <br />LIENT NAME: 20-Mile Coal Companv SAMPLE I.D.: 052610-1 <br />% MORTALITY TEST: Pass TEST RESULT LC50: >100% <br />SURVIVAL IN 100% DILUTION: 90% <br />4MPLE DATE: 05-25-10 TIME: 08:32A CLIENT ID: Site 62 <br />RGANISM: Fathead Minnow AGE: DOH 05-20-10 <br />.ST START: 5-26-10 10:30A TEST FINISH: 05-30-10 10:30A <br />APE OF TEST: LC50. 96 hours static, renewal moderately hard fresh synthetic dilution water. <br />AMMONIA: ND <br />HARDNESS: 92.19 mg/L <br />ALKALINITY: 57.81 mg/1 <br />pH: 8.01 <br />DATE HOURS CONTROL 6.25 <br />5/26/2010 INITIAL <br />5/27/2010 24 <br />5/28/2010 48 <br />5/29/2010 72 <br />5/30/2010 96 <br />MORTALITY: <br />% S URVIVAL: <br />CONDUCTIVITY (micros, <br />D.O. (mg/L) <br />pH <br />TEMPERATURE (deg C; <br />D.O.: 7.16 mg/L <br />CHLORINE: ND <br />TEMPERATURE: 19.7 deg C <br />DILUTIONS (%) <br />11) .., 1) 1; Gn <br /> <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 vv <br />20 <br />20 20 20 20 20 20 20 <br />20 20 20 20 20 20 19 <br />20 20 20 20 20 20 18 <br />20 20 20 20 20 20 18 <br />0 0 0 0 0 0 2 <br />100% 100% 100% 100% 100% 100% 90% <br />- (MIN/MAX) DILUTIONS (%) <br />CONTROL S 9S 11) R Or cn <br /> <br />311/323 <br />5441569 <br />846/863 <br />1361/1382 <br />2470/2500 <br />3550/3580 I vV <br />4320/4350 <br />6.5/7.2 6.5/7.2 6.2/7.1 6.0/7.1 5.9/7.1 5.7/7.1 5.6/7.1 <br />7.7/8.1 7.7/8.1 7.6/8.1 7.6/8.3 7.5/8.4 7.5/8.5 7.5/8.7 <br />19.4/20.2 19.4/20.2 19.4/20.2 19.4/2 0.2 19.4/20.2 19.4/20.2 19.4/20.2 <br />UtNhKAL CHEMISTRY - SAMPLE <br />AMMONIA: ND D.O.: 7.07 mg/L <br />HARDNESS: 2,479.98 mg/L CHLORINE: ND <br />ALKALINITY: 536.08 mg/L TEMPERATURE: 19.7 deg C <br />pH: 7.68 D.O AFTER AERATION: NA <br />ANOEC."J ALCULATIONMETHOD ;METHOUREFERENCE <br />75% SPEARMAN-KARBER EPA -821-R-02-012 October 2002 pg.78 <br />TIONAL COMMENTS: <br />Analysis / <br />Conducted by:/ <br />7 <br />Reviewed by: <br />Date: