AWWA WQTC62381

This slide presentation outlines information on developing and evaluating protocols for decontamination of distribution systems following an intentional contamination event. Topics covered include: existing decontamination approaches; case study of a serious intentional contamination episode; 1980 pesticide contamination; review of historical cross-contamination incidents and system recovery operations; and, identification of candidate test contaminants based upon physical and chemical properties (e.g. log Kow). The experimental strategy included two phases. The first involved contaminant adherence testing including the establishment of experimental / analytical protocols, and critical test conditions (limited substratum set), and testing of contaminant suite with a variety of pipe surfaces. The second phase involved a lab assessment of chemical decontamination agents.