Under Mr. Washburne, the center has become a bit more cutting-edge, with tenants like Banana Republic replaced by boutiques that include Stella McCartney, Dior and Alexander McQueen, which opened last week.

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Businessman Ray Washburne, who was recently named the Republican National Committee's finance chairman, grew up in the area and attended Southern Methodist University, which is right on the edge of the neighborhood.

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Instead, they found high caffeine levels near Carl Washburne State Park and Cape Lookout, two areas not near the potential pollution sources, and low levels of caffeine near large population centers such as Astoria, Warrenton and Coos Bay.

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