Source: http://www.thriftyfun.com/tf802455.tip.html

What is Drilling Fluid?

Fluid used to lubricate the bit and convey drill cuttings to the surface with rotary drilling equipment. Usually composed of bentonite slurry or muddy water. Can become contaminated, leading to cross contamination, and may require special disposal. Not used with DP methods

EPA

Source: http://www.thriftyfun.com/tf802455.tip.html

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