DAVENPORT — Construction is expected to begin this spring on a plastics housewares plant that company officials say will bring 500 new jobs to Davenport. The Davenport council Wednesday night approved rezoning land for Sterilite Corp.’s plant. The $73 million manufacturing and distribution center will cover 2.4 million square feet. Davenport Mayor Frank Klipsch says the exact groundbreaking date is not yet known.