US lawIllinoisRegulationsTitle 35 — ENVIRONMENTAL PROTECTIONCHAPTER I: POLLUTION CONTROL BOARDSUBCHAPTER d: UNDERGROUND INJECTION CONTROL AND UNDERGROUND STORAGE TANK PROGRAMSPart 731 — UNDERGROUND STORAGE TANKSSubpart E731.15235 Ill. Adm. Code 731.152Release Investigation and Confirmation (Repealed)Last amended: 1992Year: 2026Length: 9 wordsOfficial source Section 731 Section 731.152 Release Investigation and Confirmation (Repealed)Previous35 Ill. Adm. Code 731.151Next35 Ill. Adm. Code 731.153