Minnesota Administrative Rules
Agency 144 - Health Department
Chapter 4727 - EXPLORERS AND EXPLORATORY BORINGS
CONSTRUCTION AND USE OF EXPLORATORY BORINGS
Part 4727.0935 - DRILLING FLUIDS
Universal Citation: MN Rules 4727.0935
Current through Register Vol. 49, No. 13, September 23, 2024
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.
Statutory Authority: MS s 103I.101
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