The City of Brentwood, Tennessee, is located just south of Nashville and was incorporated in 1969. Interestingly, the city was founded at approximately the same time that the first Clean Water Act provisions were being enacted. Currently, the sewer collection system has over 9,500 connections, and, like many systems constructed through the EPA Grant / Loan process in the 1970's, has a structurally-sound by l&l intensive system. Pushed by regulatory, financial and public health factors, the city is embarking on a major rehabilitation program over the next several years. This paper will present a rationale for utilizing UV-cured fiberglass piping (UVCIPP) as a means for reducing wet weather sanitary sewer overflows. Cured-in-place-pipe (CIPP) has dominated the non-person-entry sewer renovation market in the United States for over twenty years. As an alternative to curing with hot water, the UV-cured liner systems use resins that cure under ultraviolet light. UV-cured liners are often made from glass-fiber or a combination of glass-fiber and polyester needle-felt, with an outer membrane and a temporary inner sleeve to protect the liner during storage, shipping and installation. It is possible to use resins with a storage time of several weeks at ambient temperature, so refrigeration is not required. Typical curing times are between 1.5 ft to 3 ft/min, and lengths of up to 500 ft can be lined continuously. Several suppliers provide materials and equipment for this procedure, but experienced contractors are virtually nonexistent. Because UVCIPP is a new technology in the United States, contract procurement is currently a complex issue that must be addressed. An analysis of three different UVCIPP projects in Brentwood is presented in this paper, with each of the three projects in various stages of completion. The paper will provide background and general analysis on factors such as contract procurement, selection of pipes to be rehabilitated, bid comparisons, and construction methods for each project. Any available visual and flow measurement data will also be included in the analysis.
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