US lawIllinoisRegulationsTitle 77 — PUBLIC HEALTHCHAPTER I: DEPARTMENT OF PUBLIC HEALTHSUBCHAPTER r: WATER AND SEWAGEPart 920 — WATER WELL CONSTRUCTION CODE920.ILLUSTRATION B77 Ill. Adm. Code 920.ILLUSTRATION BB Unconsolidated Formations: Mechanically Driven CasingLast amended: 2000Year: 2026Length: 8 wordsOfficial source Section 920.ILLUSTRATION B  Unconsolidated Formations: Mechanically Driven CasingPrevious77 Ill. Adm. Code 920.ILLUSTRATION ANext77 Ill. Adm. Code 920.ILLUSTRATION C