On May 9th, 2018, the Texas Commission on Environmental Quality (TCEQ) adopted revisions to their underground and aboveground storage tank regulations. This is part of 30 Texas Administrative Code (TAC) Chapter 334. These rules will publish to the Register on May 25th, and will be effective on May 31, 2018. These changes incorporate revisions from the EPA’s 2015 regulation revisions to Title 40 Code of Federal Regulations (CFR), part 280. While this is not an exhaustive list, the regulations include the following: – Periodic operation and maintenance requirements for UST systems to conduct walkthrough inspections and test UST system components – Requirements to ensure UST system compatibility before storing certain biofuel blends – New requirements to annually test specific release-detection equipment – Changes to comply with existing EPA release-detection requirements to monitor at least every 30 days (instead of every 35 days), and – Minor rule revisions relating to the fee on delivery of petroleum products to reflect changes that were statutorily implemented in the Texas Water Code in 2015. The state of Mississippi has also posted the redline to their proposed regulations on May 7th and are available for public viewing here. Some proposed regulation changes include the following: – Periodic operation and maintenance requirements both for 30-day and annual inspections – Previously deferred USTs such as airport hydrant systems and emergency generator tanks are now subject to UST regulations. – Updated codes of practice – New Testing requirements and frequencies – Newly added criteria for what can result in the red tagging of your facility – Updates to record retention requirements – 30-day release detection requirements – New criteria and guidelines for planned and unplanned repairs to UST systems and ancillary equipment