.gov/enviroepi, said that the former VI site, now a Utah Power and Light substation, commercial parking lot and small businesses, poses no public health risk now. Most of the site had been cleaned up when the researchers were writing their report and the last remaining contaminated soil beneath asphalt was to be remediated by the end of 2006. The Environmental Protection Agency finished cleanup of the IP site in December 2004.

They estimate that 14,000 children 15 and younger lived within two miles of the area while the facilities were operating, and put the total population at about 70,400. How many, if any, were actually exposed is unknown.

The state's study, Ball noted, had limitations. Health officials have no exposure data to know if asbestos was ever released as the vermiculite was processed. They don't know who worked at the plant at the time and so have been unable to track workers — who would have had the highest exposure — to see whether they suffered harm from asbestos exposure. As for the lung cancers, they know that about 85 percent of cases are caused by smoking, Ball said, but researchers had no information on the smoking rates in that area and whether that could account for the elevated rate.

They also couldn't account for migration in and out of the area but had to rely on addresses at the time of a cancer diagnosis. Other personal information, such as occupation, that might shed light on lung cancer causes was not available, he said.

They used cancer data from the Utah Cancer Registry and looked at Census tracts within the two-mile radius for the study. They also used mortality data from the Office of Vital Records and Statistics for the same population groups, breaking the data into five-year periods. They used data from the rest of the state as their study "control."

If they can find former workers, health officials would like to alert them to potential risks and learn more about the facilities. "We have no information on the safety precautions taken in these facilities." They know one plant employed about 10 people at a time; they don't know about the other. Anyone who worked there can call 538-6191.

They plan to reanalyze the data when another five years' worth becomes available and comb through mesothelioma case records to see if an occupation was listed for patients. The department would like to do additional research, as well, to see if it can pinpoint a likely cause of the increased lung and respiratory cancer rates, he said.

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E-mail: lois@desnews.com