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<br />ADDRESS ALL CORRESPONDENCE TO: <br />COMMERCIAL TESTING 8 ENGINEERING CO. <br />4665 PARIS STREET, SUITE &200 <br />COLORADO -CDPS WET TEST REPORT FORM -ACUTE DTEL: (303)373473/2 <br />FAX: (303) 3734791 <br />PERMITTEE: Twentvmile Coal Company CDPS NO.: CO-0036664 OUTFACE: 62-FCT <br />TYPE TEST: ROUTINE: XX ACCELERATED: SPECIES: C- dubia <br />TEST RESULTS: LCD: 76.7° STATISTICAL METHOD: Spearman-Karber <br />TEST TIME & DATE: BEGIN: 0820 AM 05/28/03 END: 0830 AM 05/30/03 <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 17 <br /># ALIVE AFTER 48 HRS: 20 20 20 20 13 0 <br /># ALIVE AFTER 72 HRS: <br /># ALIVE AFTER 96 HRS: <br />RECEIVING WATER USED FOR DILUTION? NO TOTAL RESIDUAL CI' (mg/I): <0.1 <br />HARDNESS (mgA): RECEIVING WATER: EFFLUENT: 2480 RECON WATER: 145 <br />ALKALINITY (mg/I): RECEIVING WATER: EFFLUENT: 460 RECON WATER: 90 <br />pH: INITIAL: CONTROL 8.5 100% EFFLUENT 7.9 <br />FINAL: CONTROL 8.4 100% EFFLUENT 8.1 <br />TOTAL AMMONIA AS N (mg/I): <br />INITIAL 100%: <1.0 FINAL 100%: <1.0 <br />WERE ALL TEST CONDITIONS IN CONFORMANCE WITH DIVISION GUIDELINES? YES <br />IF NO, LIST DEVIATIONS FROM TEST SPECIFICATIONS: <br />LABORATORY: SGS COMMERCIAL TESTING & ENGINEERING ANALYST: C.~_-~ <br />COMMENTS: This test failed. LCD = 76.7%. <br />04/08/03 <br />~ Commercial Testing & Engineering Co. Minerals Services -Corporate Office <br />1979 S. Highlantl Ave., Suite 2108. Lombard, IL 60140 t (630) 953-9300 116301953-9306 www.sgs.com <br />Mxmher of Ma SGS 6muv ISOC'i0n 6inlnb ee SuMtpmce7 <br />