3.D: Utah

Much like neighboring Colorado, most of Utah’s territory is covered by a conventional gasoline standard, along with a second, more stringent standard applied to the state’s main urban center (the Salt Lake City metro region). The state has adopted the 2017 edition of NIST Handbook 130, by reference, as its quality standard for conventional gasoline, with some modifications. The Handbook, in turn, adopts “the most recent version of” ASTM D4814 Standard Specification for Spark-Ignition Engine Fuel, also by reference, as the applicable standard for parameters outside the purview of EPA’s federal conventional gasoline quality regulations. The applicable federal parameters and limits are listed in Fig. 1 of Part 1 of this report, whereas the applicable ASTM D4814 parameters and limits