This document is one of several technical documents prepared in support of the Ground Water Rule(GWR). The document describes treatment technologies and best management practices (BMPs) that ground water systems can consider as corrective actions or safeguards to reduce or eliminate microbial risks. Appendices: Appendix A: Calculations Supporting the Cost of Illness (COI) Analysis; Appendix B: Detail of Benefits Valuation Inputs; Appendix C: Benefits Detail; Appendix D: Costs Details; Appendix E: Potential Implications of Population Dynamics and Secondary Transmission of Infection on the Benefits of the Groundwater Rule; Appendix F: Infectivity Dose Response Relationships: Description of Analysis Conducted to Select Model Forms and Estimate Model Parameters; Appendix G: Summary Flowcharts for Baseline Risk and Benefits Model; Appendix H: Cost Effectiveness Analysis Using a Quality-Adjusted Life Years Approach; Appendix I: Analysis of Total Coliform Hit Rates in Drinking Water Systems With Ground Water Sources; Appendix J: Changes in GWR Economic Analysis from Proposal to Final; Appendix K: Cost Details for Alternatives 1, 3, and 4; Appendix L: Summary Flow Charts for GWR Cost Model.