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4880 Robb Street, Suite 8 <br />Wheat Ridge, CO 80033 <br />(303) 621-4880 aqua-tox.com <br />.TENT NAME: Twentymile Coal Company SAMPLE I.D.: 102108-1 <br />% MORTALITY TEST: FAIL TEST RESULT LC50: 65.439% <br />SURVIVAL IN 100% DILUTION: 0% <br />AMPLE DATE: 10-20-08 TIME: 14:30PM CLIENT ID: Site 10RT <br />ZGANISM: Ceriodaphnia dubia AGE < 24 hours old <br />ST START: 10-21-08 10:45AM TEST FINISH: 10-23-08 10 45AM <br />'PE OF TEST: LC50 48 hours static, renewal, moderately hard fresh synthetic dilution water <br />AMMONIA ND <br />HARDNESS: 91.05 mg/L <br />ALKALINITY: 55.96 mg/L <br />pH: 8.03 <br />DATE (HOURS)-CONTROL 6.25 <br />10/21/2008 INITIAL <br />10/22/2008 24 <br />10/23/2008 48 <br />MORTALITY: <br />% SURVIVAL: <br />CONDUCTIVITY (microS <br />D.O. (mg/L' <br />pH <br />TEMPERATURE (deg C <br />D.O.: 7.44 mg/L <br />CHLORINE: ND <br />TEMPERATURE: 19.8 deg C <br />DILUTIONS (%) <br />19 f, 9.r, .rn 75, inn <br />20 20 20 20 20 20 20 <br />20 20 20 20 20 20 17 <br />20 20 20 20 18 7 0 <br />0 0 0 0 2 13 20 <br />100% 100% 100% 100% 90% 35% 0% <br />(MIN/MAX) DILUTIONS (%) <br />n F 9.r, 19 r, 9.5 sn 7.ri 10() <br />330/343 716/782 1151/1182 1892/1949 3670/3760 5160/5270 6530/6740 <br />7.3/7.6 7 3/7 6 7.2/7.6 7.1/7.6 6.9/7.6 6.3/7.6 6.2/7.6 <br />8.0/8.0 8.0/8.2 7.8/8.4 7.7/8.6 7.6/8.7 7.6/87 7.6/8.8 <br />19.6/20.1 19.6/20.1 19.6/20.1 19.6/20.1 19.6/20.1 19.6/201 19.6/201 <br />GENERAL CHEMISTRY - SAMPLE <br />AMMONIA: 4.40 mg/L D O.: 6.21 mg/L <br />HARDNESS: 280.14 mg /L CHLORINE: ND <br />ALKALINITY: 1,042.93 mg/L TEMPERATURE: 19.8 deg C <br />pH: 7 58 D.O AFTER AERATION: NA <br />ANOEC CALCULATION METHOD METHOD REFERENCE <br />50% SPEARMAN-KARBER EPA -821-R-02-012 October 2002 pg 78 <br />Analysis <br />Conducted by' Reviewed by: <br />Date: 1"k-J16JR Date: