Over 1,000 miles of vinyl lined asbestos cement (AC) pipe were installed primarily in
the northeast United States between 1968 and 1980. In early 1980, it was discovered
that the vinyl lining was leaching tetrachloroethylene (PCE), a reported carcinogen,
into the water distribution system. Although initial investigations indicated that it
would ultimately disappear, this PCE problem is still prevalent in several
communities 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 with
rapid-setting polymeric lining material could prevent PCE from entering the water
supply. The detailed results of this trial were published in the June 2002 issue of the Journal of
the New England Water Works Association. This paper expands on the lining
trial to include the planning, design, and construction of the 8,500 linear foot vinyl
lined AC water main relining project recently completed for the Sandwich Water
District.
The project included development of a "same day return to service" procedure for
newly lined water mains to eliminate the need for overland bypass piping, a
successful public notification program, and a stringent quality assurance program to
ensure a successful lining job. Although bypass piping was ultimately provided by
the contractor, the procedures developed for the same day return to service procedure
contributed to a very successful lining project. Post construction sample results have
confirmed that the recently applied rapid-setting polymeric lining material has
successfully eliminated the leaching of PCE into the water supply over the entire
project site. This has allowed the Sandwich Water District to permanently shutdown
four continuous flow bleeders resulting in daily water savings of approximately
22,000 gallons. Includes 5 references, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.6 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 17 |
| Published : | 06/15/2003 |
