Ill. Admin. Code tit. 77, pt. 920, ILLUSTRATION A
Current through Register Vol. 48, No. 49, December 6, 2024
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. |
Ill. Admin. Code tit. 77, pt. 920, ILLUSTRATION A