The classic Four Preps song says that it is 26 miles or 40 kilometers to Santa Catalina from the California mainland. Others say it is only 20 or 22 miles but regardless of the distance the tugs of the Connolly-Pacific Company, a Subsidiary of Knife River Corp., make regular crossings of the channel with barge loads of aggregate from a quarry on the island to construction firms on the mainland. They supply their own marine construction requirements as well as marketing rock products in the Los Angeles to San Diego area.