An underground storage tank (UST) is defined by law as "any one or combination of tanks, including pipes connected thereto, that is used for the storage of hazardous substances and that is substantially or totally beneath the surface of the ground" (certain exceptions apply). UST Owners/Operators are required to understand and comply with all UST regulations. Any deviation from regulations may result in fines and/or permit revocation.
All newly installed underground storage tanks must be double walled with the capability of monitoring the interstitial space. The piping must also provide double containment, which includes a line leak detection system, and be able to monitor the entire secondary containment system.
The following information must be submitted for the installation of UST(s):
All UST removals under Sonoma County jurisdiction require a work permit from the Department of Emergency Services Hazardous Materials Division. Permits may be downloaded below.
The following information must be submitted for the removal of UST(s):
Biodiesel can be used, either as a pure fuel or blended with conventional petroleum-based diesel fuel, to power diesel engines and has become an increasingly popular alternative fuel choice. UST Owners/Operators must remain aware of regulations regarding the storage of biodiesel. Blends of greater than 20% biodiesel have not yet been approved by the State Water Regional Control Board (SWRCB) for storage in underground tanks. Any UST Owner/Operator found to be storing a non-approved biodiesel blend in an underground storage tank will be required to remove the biodiesel product or be subject to enforcement actions and fines.
UST Owners/Operators that currently store or would like to store biodiesel in an underground tank must complete and submit a Sonoma County Notice of Intent to Store Biodiesel form (PDF: 74 kB) to our office.
The following are some important links to the SWRCB's updates on biodiesel.
Stay informed of the changing regulations regarding the underground storage of biodiesel. For more information, visit the State Water Regional Control Board website. Also, check out the California Biodiesel Alliance (CBA) website where there is information from various manufacturers regarding their product compatibility with biodiesel.
Enhanced Vapor Recovery (EVR) is required for gasoline dispensing facilities with underground storage tanks that are already required to have a vapor recovery system. Air districts that are in attainment with the state ozone standard are exempt from most EVR requirements. Air districts that have recently been designated as non-attainment areas,may have different EVR deadlines than those provided here. Check with the Bay Area Air Quality Management District or the Northern Sonoma Air Pollution Control District to determine the vapor recovery requirements for your facility.
The State deadline for EVR Phase-II upgrades was April 1, 2009. All UST Owners/Operators are required to comply with this State mandate. Those who do not meet this deadline are subject to fines and/or UST closure.
EVR upgrades require permitting from Sonoma County's Permit and Resource Management Department (PRMD) and may require a permit from Sonoma County Fire and Emergency Services Department Hazardous Materials Division. Check with our office, 707-565-1152, prior to beginning work to determine if a permit is required for installation of EVR.
For more information regarding enhanced vapor recovery, go to the California Air Resources Board website on their Vapor Recovery Program.
Contact the California Air Resources Board for additional information.