Potentially responsibly parties have yet to be named by the EPA as of February 2009

San Gabriel Valley (Area 3) is a ground water plume that runs along the axis of the west fork of the Alhambra Creek in the San Gabriel ground water basin in Alhambra, Los Angeles County, California. The plume is about 2 miles long and 1 mile wide.

The groundwater is contaminated with VOCs, including trichloroethene (TCE) and perchloroethene (PCE), at concentrations that exceed 20 times the maximum contaminant level (MCL) allowed by federal and state law.