Test air leakage rate: With a fully-charged air system (typically 125 psi), turn off the engine, release the service brake, and time the air pressure drop. The loss rate should be less than 2 psi in 1 minute for single vehicles and less than 3 psi in 1 minute for combination vehicles.
Construction on the Coronado Bridge began in 1967. Almost 500 prestressed concrete piles were fastened to the sea floor of the bay to provide the foundations for the bridge. The steel and concrete components were largely built offsite, then assembled together from marine construction barges over the bay.
Eleven of the nationâs leading bridge engineering firms submitted construction proposals. On August 11, 1930, the War Department issued its final permit for the construction of a 4,200-foot main span with a vertical clearance of 220 feet at mid-span. On August 27, 1930, Joseph Strauss submitted final plans to the Golden Gate Bridge and Highway District Board of Directors. In November 1932, contracts totaling $23,843,905 were awarded for the construction of the Golden Gate Bridge.