US lawIllinoisRegulationsTitle 77 ā PUBLIC HEALTHCHAPTER I: DEPARTMENT OF PUBLIC HEALTHSUBCHAPTER r: WATER AND SEWAGEPart 920 ā WATER WELL CONSTRUCTION CODE920.ILLUSTRATION D77 Ill. Adm. Code 920.ILLUSTRATION DD Creviced Formations: Earth Cover Less Than 30 Feet ThickLast amended: 2000Year: 2026Length: 12 wordsOfficial source Section 920.ILLUSTRATION DĀ Ā Creviced Formations:Ā Earth Cover Less Than 30 Feet ThickPrevious77 Ill. Adm. Code 920.ILLUSTRATION CNext77 Ill. Adm. Code 920.ILLUSTRATION E