AWWA DSS71333

This powerpoint presentation begins by providing a brief overview of the objective of the AWWARF Project "Practices to Prevent Microbiological Contamination of Water Mains." The significance of water mains as potential sources of contamination is presented, along with emerging issues in public water distribution systems, and the typical approach for controlling water main contaminations that is used after installation or repair. Topics covered include: factors that influence the sanitary conditions of water mains; a survey of 46 Philadelphia construction inspectors, February 2001 - prior to pipe installation, and during installation of pipe; storm water runoff; organizational barriers to sanitary practices; categories of good practices; Field Pocket Guide for Good Practices for Preventing Microbiological Contamination of Water Mains; use of ozone by Denver Water to disinfect water mains; ozone disinfection procedure; Philadelphia's water quality criteria for approving new mains for release; documenting success and failure; and, end caps/plugs. Includes tables, figure.