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Work is set to begin this week in Nogales, Ariz., to permanently repair a damaged 150-foot section of concrete wash that connects Mexico and the United States and houses a pipe that carries millions of gallons of raw sewage.

Heavy floodwaters from an Aug. 24, 2007, storm tore up the section of the wash, about 1 1/2 miles north of the border in downtown Nogales, sending sections of concrete downstream.

It put at risk a 30-inch pipe called the international outfall interceptor, which is in the section of the wash that carries up to 14 million gallons of raw sewage a day from Nogales, Sonora, to Nogales, Ariz., on its way to the Nogales International Waste Water Treatment Plant, about 8 1/2 miles north of the border in Rio Rico.

In the following days, workers shored up the stretch of wash at North Morley Avenue and East Frederick Street, near downtown, with rocks and concrete. That remedy has held up, but it was meant only as a temporary fix.

A rupture of the line would have resulted in an environmental catastrophe, with sewage spilling into the Santa Cruz River and traveling to Tucson and beyond, officials said.

The repairs will be paid for with $500,000 from the U.S Section of the International Boundary and Water Commission, spokeswoman Sally Spener said. The work will be done by by Phoenix-based MRM Construction Services, which was contracted by the U.S. Army Corps of Engineers, she said.

Workers will be removing the damaged concrete and replacing it with new, reinforced concrete. The work is scheduled to be complete by July, Spener said.

The goal is to ensure that the sewage-carrying international outfall interceptor isn't damaged in future storms, Spener said.