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Table of Contents <br />' EXECUTIVE SUMMARY.......................... <br /> List of Figures............. iii" <br /> Listof Tables.....................................................................................................................iv <br /> 1.0 INTRODUCTION......................................................................................................1 <br /> 1 1 Ferrous Iron Solution 1 <br />' 1 2 Calcium Polysulfide (Cascade` 1 <br /> 13 Study Objectives 2 <br /> 2 0 EXPERIMENTAL PROCEDURES.........................................................................3 <br />' 2 1 Sample Preparation and Characterization 3 <br /> 2 2 Soil and Water Buffering Curves 3 <br /> 2 3 Estimation of Dose Requirements/Effect on Downgradient Water Quality (Except <br />' Methane) 4 <br /> 2 4 Effect of Treatment on Methane 5 <br /> 2 5 Soil Reductant Demand (SRD) 6 <br />' 3.0 RESULTS AND DISCUSSION ................................................................................7 <br /> 3 1 Characterization of Soil and Groundwater 7 <br /> 3 2 Effect of Reducing Agents on Aqueous Cr(VI) Concentration 7 <br />' 3 3 Effect of Treatment on Secondary Water Quality S <br /> 3 4 Buffering/Titration. Curves 10 <br /> 31 Sail Reductant Demand 13 <br /> 4.0 ENGINEERING CONSIDERATIONS .................................................................15 <br /> 5.0 CONCLUSIONS ......................................................................................................16 <br /> APPENDIX A <br /> tAPPENDIX B <br /> 1 <br />' PRIMA Environmental it Eva]of Reductants <br /> January 19 2005 ATC-Diamond Walnut <br /> M <br />