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20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />19 <br />20 <br />20 <br />20 <br />20 <br />20 <br />20 <br />19 <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />1 <br />100% <br />100% <br />100% <br />100% <br />100% <br />100% <br />95% <br />333/349 <br />844/868 <br />1368/1390 <br />1874/1895 <br />2370/2400 <br />3390/3430 <br />4410/4450 <br />6.7/7.0 <br />6.8/7.1 <br />6.9/7.2 <br />7.0/7.3 <br />7.1/7.4 <br />7.2/7.5 <br />7.2/7.6 <br />7.7/8.0 <br />7.7/8.1 <br />7.6/8.1 <br />7.5/8.2 <br />7.5/8.3 <br />7.4/8.4 <br />7.4/8.5 <br />19.2/20.3 <br />19.2/20.3 <br />19.2/20.3 <br />19.2/20.3 <br />19.2/20.3 <br />19.2/20.3 <br />19.2/20.3 <br />CLIENT NAME: Twentymile Coal Company <br />50 % MORTALITY TEST: Pass <br />% SURVIVAL IN 100% DILUTION: 95% <br />SAMPLE DATE: 05 -26 -11 TIME: 11:OOA <br />ORGANISM: Pimephales promelas DOH: 5 -21 -11 <br />TEST START: 05 -27 -11 TEST FINISH: 05 -31 -11 <br />TYPE OF TEST: LC50, 96 hours, static, renewal, moderately hard fresh synthetic dilution water. <br />MODERATELY HARD FRESH SYNTHETIC DILUTION WATER CONSTITUENT <br />AMMONIA: ND D.O.: 6.95 mg /L <br />HARDNESS: 97.79 mg /L CHLORINE: ND <br />ALKALINITY: 58.41 mg /L TEMPERATURE: 19.2 deg C <br />pH: 7.99 <br />SURVIVAL DATA <br />DATE (HOURS) CONTROL <br />5/27/2011 INITIAL <br />5/28/2011 24 <br />5/29/2011 48 <br />5/30/2011 72 <br />5/31/2011 96 <br />MORTALITY: <br />% SURVIVAL: <br />DILUTIONS ( %) <br />6.25 12.5 25 50 <br />75 <br />100 <br />DAILY CHEMISTRY - (MIN /MAX) <br />CONTROL 6.25 <br />CONDUCTIVITY (microS) <br />D.O. (mg /L) <br />pH <br />TEMPERATURE (deg C) <br />GENERAL CHEMISTRY - SAMPLE <br />AMMONIA: 0.08 <br />HARDNESS: 2,388.68 mg /L <br />ALKALINITY: 599.63 mg /L <br />pH: 7.37 <br />A <br />100% • <br />ADDITIONAL COMMENTS: <br />Analysis <br />Conducted by: <br />Date: <br />DILUTIONS ( %) <br />12.5 25 50 <br />CALCULATION;METHOD <br />SPEARMAN - KARBER <br />Aqua -Tox, Inc. <br />4880 Robb Street, Suite 8 <br />Wheat Ridge, CO 80033 <br />(303) 621 - 4880 wvvw.aqua tox.com <br />ACUTE TOXICITY REPORT <br />Pimephales promelas - Fathead Minnow <br />SAMPLE I.D.: 052711 -1 <br />TEST RESULT LC5O: >100% <br />CLIENT ID: Site 62. <br />D.O.: 7.59 mg /L <br />CHLORINE: ND <br />TEMPERATURE: 19.2 deg C <br />D.O AFTER AERATION: NA <br />Reviewed by: <br />Date: <br />75 <br />METHOD REFERENCE <br />EPA - 821 -R -02 -012 October 2002 pg.78 <br />4 z � <br />