CRITERIA FOR RENOVATION OR REPLACEMENT OF WATER  TREATMENT FACILITIES GUIDANCE DOCUMENT   Through its technical proposal selection process, AWWARF chose EE&T to prepare a guidance document for utilities facing a Arehabilitate or replace@ decision for a water plant. EE&T has directed all aspects of comprehensive water treatment plant studies including structural and electrical equipment evaluations, process studies of existing treatment, and incorporation of new technologies. Drawing on this experience with a number of water plants across the United States, and supplementing that information with interviews and visits to other plants, EE&T prepared a document that details the steps needed to be taken in order to make a fully informed decision on water plant rehabilitation. The result of the projects is a comprehensive document to assist utilities in evaluating the trade-offs of rehabilitation versus replacement. The key items addressed are:    Evaluation of physical facilities, structural integrity, electrical compliance and energy conservation, and equipment suitability. Evaluation of capacity needs and capability to meet the water demands. Evaluation of the existing facilities to meet the 1986 SDWA amendments. Evaluation of the economics of replacement versus rehabilitation including capital cost, O&M, useful life, and economic comparison methods.