Phase I Environmental Database Services

New York State environmental officials last year compiled an internal list of more than 1,500 places where soil or water had been contaminated with M.T.B.E., a gasoline additive that makes water taste like turpentine and is a possible cause of cancer and other health problems.

The tally of M.T.B.E. sites is more than three times the number reported publicly in the state's toxic-spills database, which real estate buyers and suppliers of drinking water use to spot contamination problems.

It seems an environmentalist's dream: a system that can cool 10 million square feet of Cornell University dormitories, laboratories and computer rooms simply by pumping frigid water from the depths of a nearby lake. No more chlorofluorocarbons, the refrigerants that can destroy protective ozone in the atmosphere. An electric bill 80 percent smaller than for conventional air conditioners. To top it off, nothing goes back into the lake, except water that came from the lake in the first place.