Illinois Administrative Code (Last Updated: March 27, 2024)

§920.ILLUSTRATION A. Unconsolidated Formations: Oversized Drill Hole

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1. Diameter of drill hole must be 3" larger than the outer diameter of the casing or coupling, whichever is greater.

2. Casing must extend a minimum of 20'.

3. Annular space that exists between hole and casing must be filled with bentonite grout or neat cement grout within a maximum of 10 feet of the top of the screen to finished ground surface.

(Source: Amended at 37 Ill. Reg. 19676, effective November 25, 2013)

                    
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