Behind the scenes of the Bay Area’s biggest Fourth of July fireworks show 

San Francisco is set to host the Bay Area’s biggest fireworks show on the Fourth of July. This year's show in front of Pier 39 and Aquatic Park is expected to last 20 minutes.
Pat Dyas, show producer, takes Chronicle readers behind the scenes, as two barges are being equipped with thousands of explosives.
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Credit: Alyona Uvarova
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