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Aqua-Tox, Inc. <br /> 4880 Robb Street, Suite 8 <br />¢. Wheat Ridge, CO 80033 <br />_ K 03) 621-4880 aqua-tox.com <br /> ACUTE TOXICITY REPORT <br /> Cerioda hnia dubia <br />CLIENT NAME: Twentymile Coal Company SAMPLE I.D.: 033109-2 <br />50 % MORTALITY TEST: Pass TEST RESULT LC50: >100% <br />% SURVIVAL IN 100% DILUTION. 100% <br />SAMPLE DATE: 3-30-09 TIME: 11:45AM CLIENT ID: Site 87 <br />ORGANISM: _Ceriodaphnia dubia AGE: < 24 hours old <br />TEST START 3-31-09 11:25AM TEST FINISH: 4-2-09 11:25AM <br />TYPE OF TEST: LC50, 48 hours static renewal moderately hard fresh synthetic dilution water. <br />MODERATELY HARD FRESH SYNTHETIC DILUTION WATER CONSTITUENT <br />AMMONIA: ND D 0. 7 40 mg/L <br />HARDNESS: 98.15 mg/L CHLORINE: ND <br />ALKALINITY: 55.56 mg/L TEMPERATURE: 20.0 deg C <br />pH: 7.90 <br />SURVIVAL DATA DILUTIONS (%) <br />DATE (HOURS)CONTROL 6.25 12.5 25 50 75 100 <br />3/31/2009 INITIAL 20 20 20 20 20 20 20 <br />4/1/2009 24 20 20 20 20 20 20 20 <br />4/2/2009 48 20 20 20 20 20 20 20 <br />MORTALITY: 0 0 0 0 0 0 0 <br />% SURVIVAL: 100% 100% 100% 100% 100% 100% 100% <br />I ? <br />DAILY CHEMISTRY - (MIN/MAX) <br />0 <br />6.25 <br />12.5 DILUTIONS (%) <br />25 <br />50 75 100 <br />CONDUCTIVITY (microS) 314/330 454/460 5671580 7911808 1195/1218 1580/1599 1937/2270 <br />D.O. (mg/L) 7.2/7.4 7.2/7.9 7.2/8.0 7.1/8.0 7.1/8.1 7.1/8.2 7.1/8.3 <br />pH 7.9/8.0 8.0/8.0 8.0/8.0 8.0/8.0 8.0/8.1 8.1/8.2 8.1/8.2 <br />TEMPERATURE (deg C) 20.0/20.3 20.0/20.3 20.0/20.3 20.0/20.3 20.0/20.3 20.0/20.3 20.0/203 <br />L <br />GENERAL CHEMISTRY - SAMPLE <br />AMMONIA. 0.12 mg/L D.O.: 8.32 mg/L <br />HARDNESS. 109.53 mg/L CHLORINE: ND <br />ALKALINITY: 1017.53 mg/L TEMPERATURE: 20.0 deg C <br />pH: 8 09 D O AFTER AERATION: NA <br />ANOEC CALCULATION METHOD METHOD REFERENCE <br />100% SPEARMAN-KARBER EPA -821-R-02-012 October 2002 pg.78 <br />ADDITIONAL COMMENTS: <br />Analysis' <br />Conducted by: Reviewed by: <br />Date: Date: