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COLORADO - CDPS WET TEST REPORT FORM - ACUTE <br />PERMITTEE: Twentymile Coal Company CDPS NO.: CO-0027154 OUTFALL: 007 <br />TYPE TEST: ROUTINE: XX ACCELERATED: SPECIES: D. maqna <br />TEST RESULTS: LC50: >100% STATISTICAL METHOD: Binomial <br />TEST TIME & DATE: BEGIN: 1100 04/21/08 END: 1100 04/23/08 <br />DILUTIONS (% EFFLUENT) <br />MEASUREMENTS 0% 12.5% 25% 50% 75% 100% <br /># @ START OF TEST: 20 20 20 20 20 20 <br /># ALIVE AFTER 24 HRS: 20 20 20 20 20 20 <br /># ALIVE AFTER 48 HRS: 20 20 20 20 20 20 <br /># ALIVE AFTER 72 HRS: <br /># ALIVE AFTER 96 HRS: <br />RECEIVING WATER USED FOR DILUTION? NO TOTAL RESIDUAL Cl " (mg/I): <0.1 <br />HARDNESS (mg/1): RECEIVING WATER: EFFLUENT: 690 RECON WATER: 89 <br />ALKALINITY (mg/1): RECEIVING WATER: EFFLUENT: 147 RECON W ATER: 154 <br />pH: INITIAL: CONTROL 7.7 100% EFFLUENT 8.3 <br />FINAL: CONTROL 7.8 100% EFFLUENT 8.4 <br />TOTAL AMMONIA AS N (mg/1): INITIAL 100%: <0.1 FINAL 100%: -0.2 <br />WERE ALL TEST CONDITIONS IN CONFORMANCE WITH DIVISION GUIDELINES? YES <br />IF NO, LIST DEVIATIONS FROM TEST SPECIFICATIONS: <br />LABORATORY: SGS North America Inc. <br />COMMENTS: <br />ANALYST: Green, Holliday. Paulev <br />04/08/03