AWWA ACE58155

Over 1,000 miles of vinyl lined asbestos cement (AC) pipe were installed primarily inthe northeast United States between 1968 and 1980. In early 1980, it was discoveredthat the vinyl lining was leaching tetrachloroethylene (PCE), a reported carcinogen,into the water distribution system. Although initial investigations indicated that itwould ultimately disappear, this PCE problem is still prevalent in severalcommunities throughout the northeast.In 2001, Metcalf & Eddy and the Sandwich Water District conducted a lining trial,which determined that relining factory produced vinyl lined AC water mains withrapid-setting polymeric lining material could prevent PCE from entering the watersupply. The detailed results of this trial were published in the June 2002 issue of the Journal ofthe New England Water Works Association. This paper expands on the liningtrial to include the planning, design, and construction of the 8,500 linear foot vinyllined AC water main relining project recently completed for the Sandwich WaterDistrict.The project included development of a "same day return to service" procedure fornewly lined water mains to eliminate the need for overland bypass piping, asuccessful public notification program, and a stringent quality assurance program toensure a successful lining job. Although bypass piping was ultimately provided bythe contractor, the procedures developed for the same day return to service procedurecontributed to a very successful lining project. Post construction sample results haveconfirmed that the recently applied rapid-setting polymeric lining material hassuccessfully eliminated the leaching of PCE into the water supply over the entireproject site. This has allowed the Sandwich Water District to permanently shutdownfour continuous flow bleeders resulting in daily water savings of approximately22,000 gallons. Includes 5 references, figures.

Product Details

Edition:

Vol. - No.

Published:

06/15/2003

Number of Pages:

17

File Size:

1 file , 1.6 MB