This chapter establishes the underground storage tank revolving loan and grant program pursuant to chapter 70A.345 RCW and outlines the program requirements and processes. The purpose of the program is to assist owners or operators of petroleum underground storage tank systems to: Remediate past releases; upgrade, replace, or remove petroleum underground storage tank systems to prevent future releases; or install new infrastructure or retrofit existing infrastructure for dispensing or using renewable or alternative energy. The program also assists owners and operators of heating oil tanks to remediate past releases or prevent future releases by upgrading, replacing, decommissioning, or removing heating oil tank systems.