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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 />.TENT NAME: Twentymile Coal Company SAMPLE I.D.: 033109-1 <br />% MORTALITY TEST: Pass TEST RESULT LC50: >100% <br />SURVIVAL IN 100% DILUTION: 100% <br />AMPLE DATE: 3-30-09 TIME: 13:35PM CLIENT ID: Site 62 <br />ZGANISM: Ceriodaphnia dubia AGE: < 24 hours old <br />ST START 3-31-09 11:15AM TEST FINISH: 4-2-09 11:15AM <br />PE OF TEST: LC50, 48 hours, static renewal moderately hard fresh synthetic dilution water. <br />ALKALINITY: <br />pH: <br />3/31/2009 INITIAL <br />4/1/2009 24 <br />4/2/2009 48 <br />MORTALITY: <br />% SURVIVAL: <br />CONDUCTIVITY (micros <br />D.O. (mg/L; <br />pH <br />TEMPERATURE (deg C <br />CONTROL 6.25 <br />CHLORINE: <br />TEMPERATURE: <br />DILUTIONS (%) <br />19..5 ?R Fn 7r, Inn <br />20 20 20 20 20 20 20 <br />20 20 20 20 20 20 20 <br />20 20 20 20 20 20 20 <br />0 0 0 0 0 0 0 <br />100% 100% 100% 100% <br />I 100% <br />E 100% 100% <br />- (MIN/MAX) DILUTIONS (%) <br />0 6.25 12 ..5 7.9; 7? inn <br />314/328 557/569 779/793 1165/1210 1855/1880 2760/2870 3450/3590 <br />7.3/7.4 7.2/7.9 7.2/8.0 7.2/8.0 7.2/8.1 7.2/8.2 7.1/8.3 <br />7.9/8.0 8.0/8.1 8.0/8.2 8.0/8.4 8.0/8.4 7.9/8.2 7.9/8.0 <br />20.0/20.3 20.0/20.3 20.0/20.3 20.0/20.3 20.0/20.3 20.0/20.3 20.0/20.3 <br />MISTRY - SAMPLE <br />AMMONIA: 0.04 mg/L D. 0., 8.29 mg/L <br />HARDNESS: 1962.94 mg/L CHLORINE ND <br />ALKALINITY 422.93 mg/L TEMPERATURE 20 0 deg C <br />pH 7.86 D.O AFTER AERATION NA <br />NOEC CALCULATION METHOD METHOD REFERENCE <br />100% SPEARMAN-KARBER EPA -821-R-02-012 October 2002 pg 78 <br />r-wvl I IviV/1L IrVIVIIVICIV i J: <br />Analysis <br />Conducted by: - - y ?.? Reviewed by: