Title: CSPE: The Worlds Oldest Floating Cover, Still Performing After 40 Years
Summary:

Installed in 1980, the Hinkle Reservoir floating cover in the San Juan Water District is believed to be the worlds oldest floating cover in continuous operation.  It remains a testimony to the outstanding durability of the CSPE manufactured by Burke Industries.

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CSPE: The Worlds Oldest Floating Cover, Still Performing After 40 Years