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Upgrade, New Construction, and Compatibility Requirements <br /> California Code of Regulations, Title 23, Division 3, Chapter 16, <br /> Sections 2631(1), 2635(d), 2636(f)(5), 2640.1, 2665(b), (c), 2666(b)(2), (e)(2), & (f), <br /> 2711(c), & 2712(b)(5) <br /> Can a single-walled UST change to a motor vehicle fuel containing a <br /> concentration greater than ten percent ethanol or five percent biodiesel? <br /> Yes. However, at least 30 days prior before changing the motor vehicle fuel stored to a <br /> motor vehicle fuel greater than ten percent ethanol or five percent biodiesel, UST <br /> owners or operators must provide to the UPA an approval from an independent testing <br /> organization that covers the substance to be stored. The acceptable mechanisms to <br /> demonstrate compatibility for each UST component type can be found in the table in <br /> Appendix 1 of this document. <br /> [References cited: §§ 2640.1 & 2711(c)] <br /> If there are further questions regarding the new construction, upgrade, or compatibility <br /> requirements, please contact UST Leak Prevention Unit staff at: <br /> https://www.waterboards.ca.gov/water issues/programs/ust/contacts/ust staff.shtml. <br /> Enclosure (1) <br /> 1. Appendix 1: Acceptable Mechanisms to Demonstrate Compatibility for <br /> Underground Storage Tanks <br /> Documents with Superseded Content <br /> Local Guidance (LG) Letter-159: Annual Underground Storage May 2011 <br /> Tank Compliance Inspection Handbook <br /> Overview of UST Containment and Monitoring Requirements June 2008 <br /> UST Facility Inspection Handbook August 2000 <br /> UST Regulatory Compliance/Inspection Training September 2004 <br /> LG 150-2 and Enclosure. Underground Storage Tank Overfill July 2007 <br /> Prevention Systems <br /> LG 166: Guidelines for Testing Spill Buckets January 2006 <br /> LG 167: Qualifications & Scope of Work for UST Installers and March 2006 <br /> Service Technicians <br /> Compatibility of Underground Storage Tanks Storing Gasoline July 2015 <br /> with Ethanol <br /> Alternative Compatibility Options June 2012 <br /> Understanding Line Leak Detection Systems June 2008 <br /> Page 4 of 5 <br /> January 2019,v 1.0 <br />