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Timetable for Puget Sound restoration suffers setback
Date:12/18/2008

ations of lead and arsenic found in the sediment reflect past human activities. The study found accumulations of the hazardous metals first showed up in Sound sediments around the 1890s when metal smelting began near Tacoma.

"We find a rise in concentrations during the first and second World Wars," said PNNL marine scientist and co-project lead Eric Crecelius. "Our core analysis detected reductions during the Great Depression when smelting production stopped, but increased again during World War II."

Scientists observed a steady decline in contaminant concentrations after federal regulations, like the Clean Water Act in the late 1960s, were adopted. Similar findings were observed in other marine systems near major urban centers, such as San Francisco Bay and Chesapeake Bay, according to Crecelius.

Metal concentrations in sediments decreased more rapidly after major point sources, like the Tacoma smelter, were closed. For example, arsenic concentrations in sediments near Seattle have returned to preindustrial levels, after the Tacoma smelter closed in 1986.

"This historical record for arsenic is a perfect example of the Puget Sound's ability to recover from past pollution insults following removal of the smelter point source, as well as how quickly this process occurs," said Crecelius.

Natural recovery competes with urban growth

More recently, however, regulation of point sources has grown less and less effective at restoring the health of the nation's waters. In 2005, the U. S. Environmental Protection Agency determined that runoff was the leading source of water quality pollution affecting coastal systems across the nation. This is partly due to urban growth and an increasing number of toxic non-point sources, such as storm water that rinses highways of oils and pollutants and carries this burden into sensitive coastal systems.

Crecelius notes that these diffuse sources of toxics are
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Contact: Geoff Harvey
geoffrey.harvey@pnl.gov
509-372-6083
DOE/Pacific Northwest National Laboratory
Source:Eurekalert

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