Valero Renewables-Hartley is located near Hartley, Iowa, about 100 miles east and south of Sioux Falls, S.D. The bio-refinery sits on approximately 350 acres and started ethanol production in August 2008. The facility uses a dry-grind production method and state-of-the-art technology to maintain industry-leading standards in production, safety and product quality. The plant is also designed to be among the most environmentally friendly facilities in the industry.