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Region VIII Guidance for Acute Whole Effluent Reporting <br />~RMITTEE NAME: Western Fuels Co. SITE ID: New Horizon Mine OUTFACE NO: 008 <br />50% MORTALITY TEST: Pass X Fail LC50: 55.5% <br />TEST (Anima!/Age): Ceriodaphnia <24 hours. <br />DATE/T[ME TEST BEGAN: 12/27/01 2:35 pm <br />SAMPLE (Date/Typef: 12/26/01 Grab. <br />DATE/TIME TEST COMPLETED: 12/29/01 2:30 pm <br />Survival Totals <br />Dilutions (% ECllucnt) <br />Recon Receiving 6.25% 12.5% 25% 50% 100% <br />Water Water <br />Initial 20 na 20 20 20 20 20 <br />24 hrs 20 na 20 20 20 20 16 <br />4R hrc 20 na 20 20 20 13 0 <br />Max/Min Values <br />Dilutions (% Effluent) <br />Recon Receiving 6.25% 12.5% 25% 50% 100% <br />Water Water <br />Dissolved Oxygen 7.3/6.5 na 7.6/6.7 7.5/6.5 7.4/6.4 7.5/6.4 7.8/6.7 <br />Temnerahme C°C) 20 fi/19 4 na 20 fi/19 4 20.4/19.4 20 4/19.4 20 4/19 4 70 4/19 4 <br />~eceiving Water used Cor Dilution? (Y of N) N <br />Hardness, mg/L CaCO3: Receiving Water na Recon Water 180 Effluent 2 667 <br />Initial Tota{ Residual Chlorine, mg/L Cl2 100% E(Buent: <0OS <br />Reconstituted pH: Initia17.98 After 24 hours 8.05 <br />Receiving Water pH: Initial na After 24 hours na <br />pH in 100% Effluent: Initial 7.18 After 24 hours 7.94 <br />Ammonia as N, mg/L: 100% Effluent Initial 3_04 Receiving Water na Recon Initial <0.05 <br />Conductivity, umhos/em: 100% Effluent 4 230 Receiving Water na <br />Alkalinity, mg/L CaCO3: 100% ECCluent 500 Receiving Water na <br />Analyst: Lec Rawlings Laboratory: Water & Environmental Testing. Inc. <br />Signature: ~ Date: //7~~ <br />Comment 00% at 48 hours has hardness precipitation Flakes Floating on the surface. This su¢zests toxicity is due to excess <br />hardness and/or high Total Dissolved Solids water. Water not stable. <br />• <br />Page 5 of l0 <br />