TITLE 62: MINING
CHAPTER I: DEPARTMENT OF NATURAL RESOURCES
PART 240 THE ILLINOIS OIL AND GAS ACT
SECTION 240.720 SURFACE AND PRODUCTION CASING REQUIREMENTS FOR CONVERSION TO CLASS II UIC WELLS
Section 240.720 Surface and Production Casing Requirements for Conversion to Class II UIC Wells
a) Surface Casing
For conversions of existing production wells which do not have surface casing completely covering the fresh water zone, further cementing is not required unless it is necessary to establish external mechanical integrity in accordance with Section 240.770.
b) Production Casing
For all conversions of existing production wells, cement shall extend to at least one hundred (100) feet above the injection interval or the bottom of the casing in an open hole completion.
(Source: Former Section recodified to Section 240.680; new Section adopted at 15 Ill. Reg. 15493, effective October 10, 1991)