Environmental officials are questioning a developer’s plan to build four industrial condo warehouses on a 14-acre property along Great Pasture Road that extends into Bethel. The site, once home to audio tape manufacturing, has a history of chemical contamination. Danbury officials say leaking containers remain on the property, and wetlands commission members note large piles of woodchips could harm a nearby waterway. The developer claims the site was remediated in 2003 and plans indicate minimal impact on wetlands.