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alternative to ethylene glycol?

Does anyone know of an environmentally safe alternative to ethylene
glycol or propylene glycol? 

Currently, ethylene glycol is being used as antifreeze inside a liquid
seal on a sluice gate of a dam. In other words, the ethylene glycol is
circulated through an "inner tube" to keep it from freezing. The "inner
tube" forms the seal on the sluice gate. Alternatives would need to meet
the following requirements: a liquid, a freezing point around - 30
degrees Fahrenheit and less toxic than ethylene glycol. The operators
might be interested in a new seal design. Any suggestions?

James DeMay
Hazardous Waste & Toxics Reduction
Department of Ecology
Bellevue, WA
(425) 649-7090