Nevada Administrative Code (Last Updated: January 6, 2015)

NAC534.042. “Bentonite grout” defined.

Latest version.

“Bentonite grout” means a commercially manufactured product consisting of the sodium montmorillonite that, when mixed with water pursuant to the specifications recommended by the manufacturer, is specifically designed by the manufacturer to seal and plug wells and boreholes and:

     1. Consists of not more than 84.6 percent water and not less than 15.4 percent sodium bentonite by weight of water, except that additional additives may increase the solids ratio above and beyond the minimum 15.4 percent sodium bentonite;

     2. Has an API standard filter press fluid loss of less than 9.0 cubic centimeters;

     3. Is easily hydrated when mixed with fresh water in the ratio of 33 gallons for every 50-pound bag of bentonite grout;

     4. Has hydraulic conductivity or permeability values of 10^-7 centimeters per second or less; and

     5. Has a fluid weight of not less than 9.2 pounds per gallon.

(Added to NAC by St. Engineer, eff. 12-30-97; A by R009-06, 6-1-2006; R039-12, 6-29-2012)

                    
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