Mo. Rev. Stat. § 319.138

Notwithstanding the provisions of section 319.100 and subdivision (1) of subsection 3 of section 319.131, the fund shall provide moneys for cleanup of contamination caused by the releases from piping or related equipment of a petroleum storage tank with a capacity of five thousand gallons or less when such retailer is the sole provider of retail fuels within a five-mile area. The costs of the cleanup must be incurred after April 1, 1999, and prior to April 1, 2000. The retailer must make application for participation in the fund by August 28, 1999.