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-3- <br />K Is switching from petroleum diesel to a biodiesel- , <br />of stored substance? <br />Yes. When any percentage of biodiesel is added to an UST system that has been <br />permitted to store petroleum diesel fuel, it is considered a change of stored substance. <br />California Code of Regulations, Title 23, section 2711 requires the UST owner or <br />operator to inform the local regulatory agency of the hazardous substances that are <br />stored, or are proposed to be stored, in the UST system. Section 2711 also requires the <br />owner or operator to notify the local agency of any changes to that information within <br />thirty days unless required to obtain approval before making the change. We strongly <br />advise local regulatory agencies to require notification from the UST owner/operator <br />PRIOR to any change of stored substance. This will allow the local agency to determine <br />ahead of time whether or not the UST system is suitable for storing the new substance. <br />demonstrate4. Must an owner or operator of a UST material compatibility <br />biodieselto storing <br />Yes. California Health and Safety Code, Chapter 6.7, requires primary containment to <br />be compatible with the product stored 4. This means that the primary containment must <br />retain its chemical and physical properties upon contact with the stored substance for <br />the life of the UST system under normal operating conditions. California Health and <br />Safety Code, Chapter 6.7, also requires that secondary containment be designed to <br />prevent structural weakening as a result of contact with the stored substances. These <br />requirements apply to any regulated UST system installed after 1984, including those <br />storing biodiesel or biodiesel blends. The UST owner/operator is ultimately responsible <br />for ensuring that their UST system is compatible with the stored product at all times. <br />If you have questions regarding this document, please contact Laura Fisher -Chaddock <br />at (916) 341-5870 (Ichaddock@waterboards.ca.gov) or Robert Hodam at <br />(916) 341-5871 (rhodam aterboards. .gov). <br />Sincerely, <br />Original signed by <br />Kevin L. Graves, P.E. <br />Underground Storage Tank Program Manager <br />4 §25291(a)(1), §25290.1(c)(1), §25290.2(c)(2) <br />s §25291(a)(2), §25290.1(c)(2), §25290.2(c)(2) <br />California Environmental Protection Agency <br />Recycled Paper <br />