"We pretty much feel confident that we removed the source of contamination," Nguyen said.

Excavation stopped, however, partly because of so many underground utility lines and the area's proximity to busy streets. And Woods Cross shut down one of its four drinking water wells because of consistently high amounts of potentially cancer-causing chemicals showing up in tests. The EPA said that migration of the plume is likely to increase contamination in wells over time.

Nguyen added that the EPA does not yet know the size of the Five Points plume west of Patterson's business, located just up the hill from Karla Scott's home of 40 years. Although there is one old monitoring well a block away, and the EPA will be installing new monitoring wells in the coming year, at this point it's unknown what the impacts are from that plume, which the EPA said contains PCE.

Patterson recalled two other dry cleaners near the old Five Points Mall that possibly could be held accountable for the Five Points plume, but he said they are no longer in business. Patterson bought his Bountiful location in 1963. The money he spent on testing and clean-up is not covered by insurance, although the expenses do qualify as a tax write-off.

"You don't get much of a sympathetic ear, because you own the land, and who owns the land pays," Patterson said. "If I could go back on who had the tank, I might seek recovery from them."

Even though the Five Points plume got its official EPA priority listing last year, Patterson has been dealing with state and federal officials for about nine years, drilling and testing to see where and what type of contamination existed. It is all a result of a drinking water test years ago that found unacceptable levels of PCE present.

Your Valet now says on its Web site it is the first dry cleaner in Utah to offer a new process called GreenEarth Cleaning, which instead of PCE uses a silicone-based cleaning solution developed by General Electric in the 1990s. It is a modified liquid silicone similar to what's found in cosmetics, shaving creams and deodorants that "will not pollute our water, soil or air."

Patterson said only one of his six locations still needs converting to GreenEarth, at a cost of about $15,000. There's no law that says he has to make the conversion, but it's something he said he's doing in good conscience.

"There's not a lot more that I can do, short of tearing up the intersection and knocking the building down," he said. "It's expensive, and we've done what we can do. I hope it's over."

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E-mail: sspeckman@desnews.com