Plugging of Heat Pump Wells

PURPOSE: This rule sets standards on the proper plugging of wells used in heat pump applications. (1) Vertical Closed-Loop Heat Pump Wells. To plug a properly constructed vertical closed-loop heat pump well the following specifications must be met: (A) Remove all heat transfer fluid from the closed-loop and take necessary precautions to ensure groundwater protection; and (B) Dig down to the top of borehole and cut off the loop pipe at least three feet (3') below the surface. Pump the remaining loop full of bentonite or cement slurry. Allow the grout to fill the upper one foot (1') of borehole. Fill remaining hole with compacted earth or pavement. (2) Open-Loop Heat Pump Wells. Wells used to supply water for heat pump and water return wells must be plugged pursuant to 10 CSR 23-3.110. AUTHORITY: sections 256.606, 256.623, and 256.626, RSMo 2016.* Emergency rule filed Nov. 16, 1993, effective Dec. 11, 1993, expired April 9, 1994. Original rule filed Aug. 17, 1993, effective March 10, 1994. Amended: Filed May 17, 2013, effective Dec. 30, 2013. Amended: Filed June 27, 2018, effective Feb. 28, 2019. *Original authority: 256.606, RSMo 1991; 256.623, RSMo 1985, amended 1991; and 256.626, RSMo 1985, amended 1991.