US lawArizonaRegulationsTitle 18 — Environmental QualityChapter 12 — Department of Environmental Quality - Underground Storage TanksR18-12-257R18-12-257R18-12-257. ReservedReservedLength: 2 wordsOfficial source Cite as Ariz. Admin. Code § R18-12-257R18-12-257. ReservedPreviousR18-12-256NextR18-12-258