https://prevailcrew.com/davis-bacon-wage-rates/district-of-columbia 2026-08-27 weekly 0.8 https://prevailcrew.com/davis-bacon-wage-rates/district-of-columbia/dc20260001 2026-08-27 weekly 0.6 https://prevailcrew.com/davis-bacon-wage-rates/district-of-columbia/dc20260002 2026-05-18 weekly 0.6 https://prevailcrew.com/davis-bacon-wage-rates/district-of-columbia/dc20260003 2026-05-18 weekly 0.6