… … Sustainability Sustainability At Foothill Transit, we embrace sustainability because it benefits all aspects of our business, while also helping our communities by protecting the environment through measured and responsible stewardship of resources. Let's Clear The Air Foothill Transit has led the charge in sustainable transportation for years. It’s why we … is stored at the new Pomona Hydrogen Fueling Station in a 25,000-gallon tank. Liquid hydrogen is delivered every other day into the hydrogen tank. The liquid hydrogen is then pumped by two cryogenic pumps into two vaporizer towers where it is …