10 CSR 23-4.080 - Plugging of Monitoring Wells

PURPOSE: This amendment removes unnecessary regulatory burdens and moves substantive certification and registration requirements to 10 CSR 23-2.020 Certification and Registration.

(2) (1) When plugging a monitoring well, the following minimum requirements shall be met:

(A) Remove all pumps, sampling equipment, debris, or other substances;

(B) Remove the surface completion from the borehole ensuring that the grout seal is not disturbed. Cut off riser pipe and/or casing two feet (2') below ground surface;

(C) Fill the well from bottom to within one foot (1') of ground surface with grout pursuant to 10 CSR 23-4.060(9);

(D) After the grout is fully cured, check for settlement and top off if necessary. Fill remaining hole with soil or pave.

(E) Flush mount completions in paved areas may be left in place and filled with asphalt or concrete;

(E) (F) A monitoring well may be completely excavated as opposed to being plugged with grout. If the well is over drilled, the borehole shall be completely filled with grout pursuant to 10 CSR 23-4.060(9); and

(G) A nonrestricted monitoring well installation contractor must be on site at all times during the excavation and plugging operations.

(5) (2) Temporary monitoring wells ten feet (10') or greater in depth must be plugged by removing any temporary pipe and filling the well from total depth to two feet (2') from the ground surface with approved grout, with the remainder of the well filled with compacted uncontaminated native material or grout.

Temporary monitoring wells shall be plugged within thirty (30) days of the date of completion.

Notes

10 CSR 23-4.080

AUTHORITY: sections 256.606, 256.615, and 256.623, RSMo 2000.* Emergency rule filed Nov. 16, 1993, effective 12/11/1993, expired 4/9/1994. Original rule filed Aug. 17, 1993, effective 3/10/1994. Amended: Filed July 13, 1994, effective 1/29/1995. Amended: Filed Nov. 1, 1995, effective 6/30/1996. Amended: Filed Nov. 18, 2010, effective 7/30/2011. Amended by Missouri Register January 15, 2019/Volume 44, Number 2, effective 2/28/2019

*Original authority: 256.606, RSMo 1991; 256.615, RSMo 1991; and 256.623, RSMo 1985, amended 1991.