0928_beam_ching_012
A construction worker wipes his mask after cleaning up the fire proofing material on a steel beam at Salesforce Transit Center in San Francisco, Calif., on Friday, September 28, 2018.
A construction worker wipes his mask after cleaning up the fire proofing material on a steel beam at Salesforce Transit Center in San Francisco, Calif., on Friday, September 28, 2018.
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