LONGVIEW — After evaluating the area for about a year, a new company has agreed to build a fertilizer plant at Longview’s Mint Farm Industrial Park that would employ up to 100 workers and cost up to $1 billion. Pacific Coast Fertilizer LP is a joint venture backed by Texas-based Saturn-Ferrostaal Chemicals LLC, Ferrostaal, Haldor Topsoe and Canada-based Pacific Fertilizer. Pacific Coast Fertilizer LP was founded by Ferrostaal Topsoe Projects and Saturn Ferrostaal Gas Chemicals.