Connecticut’s two senators are proposing $300 million in federal funding to help people and businesses with crumbling foundations. If the plan is approved, half of the money would be provided through the Federal Emergency Management Agency. The rest of the funds would go to states like Connecticut that set up nonprofit organizations to help homeowners pay to replace the foundations of their houses and condos. Tens of thousands of foundations in eastern Connecticut were built with concrete that was contaminated and which corrodes over time.