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• <br />G AVEIONICS PROPRIETARY & CONFIDENTIAL <br />Mine Water Treatment — Peabody Energy Page 13 of 48 <br />5. Preliminary System Specifications, . <br />5.1 Water Quality Output <br />Below are the targets for the expected influent and effluent ranges for the full -scale <br />system — <br />Table 2: Water Quality Influent and Effluent Range <br />• <br />Item <br />- Influent Range <br />Effluent Range <br />Total Dissolved Solids (TDS) <br />Up to 6,380 mg /I <br />< 750 umhos /cm <br />Iron (Fe) <br />1.5 — 14 mg /I <br />< 1.0 mg /I <br />Turbidity (NTU) <br />160 — 600 NTU <br />< 5.0 NTU <br />Sulfate <br />Up to 2,680 mg /I <br />< 250 mg /I <br />Temperature <br />— <br />Average temperature (10 °C) <br />5.1.1 Water Quality Discharge Automation <br />Water Tectonics' final design will leverage standard equipment, real -time <br />measurement, controls and software that provide our client with <br />assurances that only water within specifications is being discharged. <br />Based on our current understanding, the State of Colorado equates water <br />Conductivity with Total Dissolved Solids. Water Tectonics will incorporate <br />a real -time conductivity measurement into the discharge analysis to ensure <br />that only compliant water is being discharged. <br />• <br />Document Version: 4.0 © Water Tectonics, Inc. 2008. All rights reserved. <br />tO WATERTECTONICS <br />