Work on the second span was temporarily interrupted in July 1940 when 250 workers at Smoot Sand & Gravel walked out to protest a job classification by the federal Wage and Hour Division. The men worked on barges dredging gravel, and wanted to be classified as seamen so they could qualify for overtime and work more than the federally approved 42-hour work week. The strike began on July 9, lasted five days, and idled more than 6,500 workers (including those working on the Social Security and Railroad Retirement Board buildings) as no concrete could be delivered. The men won reclassification as seamen, a 10 percent wage increase, and pay for five days they were idle.