California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 7 - General Industry Safety Orders
Group 20 - Flammable Liquids, Gases and Vapors
Article 145 - Tank Storage
Section 5591 - Location of Outside Aboveground Tanks with Respect to Important Buildings on Same Property

Every outside aboveground tank shall be separated from important buildings on the same property by distances not less than those specified in Section 5589(a) through (e), whichever is applicable. The appropriate distance column in Tables FL-10 through 15 that shall be used shall be the one reading: "Minimum Distance in Feet from Nearest Side of a Public Way or from Nearest Important Building."

NOTE: Important buildings are those buildings containing employees, flammables or explosives.