Minn. R. agency 144, ch. 4727, CONSTRUCTION AND USE OF EXPLORATORY BORINGS, pt. 4727.0935

Current through Register Vol. 49, No. 29, 2025

Part 4727.0935 - DRILLING FLUIDS

Subpart 1.Water.

Water used for drilling, repair, or sealing of an exploratory boring must:

A. come from a potable water system, the boring itself, an exploratory boring of similar use and construction, or surface water. Surface water may be used only if the exploratory boring is located in a remote area where a potable water source is not available and the water has been disinfected by mixing sufficient chlorine so that after a minimum 30-minute contact time a chlorine residual exists;

B. contain a free chlorine residual at all times, except for water taken from the boring itself; and

C. if transported, be conveyed in clean and sanitary tanks, storage vessels, and water lines.

Subp. 2.Drilling additives.

Drilling additives must meet the requirements of NSF Standard 60-1988 as determined by a person accredited by ANSI under ANSI Standard Z34.1-1987. A drilling additive is a substance added to the air or water used in the fluid system of drilling an exploratory boring.

Minn. R. agency 144, ch. 4727, CONSTRUCTION AND USE OF EXPLORATORY BORINGS, pt. 4727.0935

28 SR 147

Statutory Authority: MS s 103I.101