From Deseret News archives:
No asbestos-linked cancer increase found near plants
Study targets rates near former vermiculite sites
People who worked at the plants and their household members, though, were likely exposed to asbestos at levels that could cause concern, health officials say. Now they're hoping that former employees of the two vermiculite facilities will contact them so they can see whether working directly with the material had adverse health effects.
Vermiculite is the fluffy, shiny material in ceiling insulations and potting soils, although it starts life as an ore that only becomes fluffy when it expands and pops, somewhat like popcorn.
Concern about the vermiculite processed in Utah arose because much of it came from a mine in Libby, Mont., which was contaminated with asbestos, said Wayne Ball, a Utah Department of Health toxicologist. When the vermiculite pops, a process called "exfoliation," asbestos can be released. The Libby mine was closed in 1990.
But the Utah Department of Health study of cancer data between 1973 and 2000 found that within a two-mile radius of the VI facility, rates of the two primary cancers related to asbestos exposure, mesothelioma and asbestosis, were no higher than in other parts of the state. Conversely, lung and respiratory cancers were 50 percent higher, "and we don't know why," Ball said.
When an environmental agent is the cause, he said, trends can be spotted. There was no upward or downward trend on respiratory cancer rates over the 28-year time period studied, from 1973-2000. "It was elevated, but consistent. We don't know what was happening, but because mesothelioma was not increased, we don't feel these facilities contributed to lung cancer rates in the area," he said.
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