A toxicologist hired by Contra Costa County has begun collecting soil samples to be tested for contaminants related to last year’s accidental release of “spent catalyst” from the Martinez Refining Company.

TRC, a Concord-based environmental consulting firm, is collecting samples from 14 locations in the central and western parts of the county to see if they contain elevated levels of certain harmful metals, including aluminum, barium, chromium, nickel, vanadium and zinc.

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Kiley Russell writes primarily for Local News Matters on issues related to equity and the environment. A Bay Area native, he has lived most of his life in Oakland. He studied journalism at San Francisco State University, worked for the Associated Press and the former Contra Costa Times, among other outlets. He has covered everything from state legislatures, local governments, federal and state courts, crime, growth and development, political campaigns of various stripes, wildfires and the aftermath of Hurricane Katrina.