AWWA ACE68710

This powerpoint presentation begins by providing a brief overview of the East Valley Water District in California's San Bernardino County and historic perchlorate levels. In 2006, the district started a planning level study to evaluate a centralized treatment facility consisting of four existing wells (Wells 24A, 24B, 25, and 107) that would treat for both perchlorate and nitrate. Project objectives included the following: develop conceptual-level design criteria for ion exchange and biological treatment; estimate life cycle costs; and, recommend treatment technology. Biological treatment alternative is outlined, along with life cycle cost analysis assumptions and a product flow comparison. Presentation conclusions and recommendations include the following: at this facility for low-level perchlorate and nitrate treatment, ion exchange is less expensive on a per acre-foot basis; use non-regenerable ion exchange for perchlorate removal; and, use regenerable ion exchange for nitrate removal. Includes tables, figures.