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Or why they were set so high. According to Dan Hirsch, a California expert on nuclear-policy issues, the detection limits in the Lowry database are so high that, in many cases, they effectively mask any evidence of contamination. "If the data are reported correctly, the agencies are using detection limits that grossly exceed safe drinking-water levels," he says. "If this is indeed what they have done, it would be inappropriate from a health standpoint, because their monitoring techniques would be incapable of seeing contamination at the levels that these agencies say produce unacceptable health risks."

This practice of labeling high results as U's, or nondetects, extends to numerous other radionuclides and many of the non-radioactive compounds as well.

"I don't know the reason behind it," Hooten responds, when asked why the detection limits for the database were set so high. "It could have been the Lowry Coalition, CH2M Hill or Waste Management."

But according to Lori Tagawa of Waste Management, the lab sets the detection limits. "We don't tell them what the detection limit should be because we don't have any idea," she says.

As the federal regulatory agency overseeing Lowry, the EPA could have ordered its contractors to come up with results that would have showed the actual levels of contaminants present in the landfill. In an undated paper, Milt Lammering, the EPA's own radiation expert, notes that the detection limits at Lowry had been set so "unrealistically high" that it was impossible to know with certainty what the concentrations of plutonium and americium were in some wells.

Despite public opposition, landfill officials moved ahead with the project, and on the morning of July 25, 2000, Lowry groundwater began flowing through the sewers. A few hours later, a manhole on East Hampden Avenue blew its cover and spewed 1,880 gallons of contaminated water across the ground.

After fixing the manhole and reporting the incident to the EPA, Lowry officials turned the water back on. For three months, the clear-looking liquid whooshed through darkened sewers at a rate that was roughly equal to four garden hoses running at full strength.

Before leaving Lowry, the water was pumped into a small treatment facility, where it was passed through carbon filters and a tank filled with ultraviolet light. These processes are supposed to reduce volatile organic chemicals such as solvents, but they do nothing to remove the heavy metals, radionuclides, PCBs or pesticides still present in the water.

A round of sampling done just days before the discharge began showed 0.32 picocuries of americium present in the water. While that was a very small amount, it's still twice the state standard for groundwater and much higher than what you'd except to find in a normal background sample.

Other samples showed a total of 0.15 picocuries of plutonium-238 and -239 in the treated water. Again, it was a small amount -- but still higher than what you'd expect to find under normal conditions.

Lowry officials had hoped to pump a mix of water through the sewers: 70 percent from the northern portion of the site and 30 percent from a much more contaminated area near the center of the landfill called the "North Toe." But the North Toe water proved to be so contaminated that officials soon began debating whether they should reduce that portion of the mix to 5 percent.

On October 20, the discharge was again halted when a lab discovered that the water was toxic to a small organism called Ceriodaphnia dubia. These small crustaceans do what canaries do in underground mines: They alert scientists to potential problems that could later affect larger creatures, such as fish and humans.

For three months, officials from Metro, Denver and Waste Management tried to figure out what was wrong. Eventually they concluded that it was the test itself -- and not the water -- that was causing problems. On January 12 of this year, the flow resumed.

Asked how long the discharge could go on, Metro's Pearlman responds, "You should continue it going on in perpetuity."

That's too long, says Lloyd Hesser, a trucker who hauled chemicals to the landfill years ago. "They'll never get that water clean," he adds. "There's no way you can dilute that stuff."

Read more Westword coverage of the Lowry Landfill

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Eileen Welsome

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