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Recommended Plugging and Stemming Drill Holes Treatment Due to shipping and handling, a small amount of fine bentonite particles may be present. For optimum results, HOLEPLUG° should be poured over a mesh or screen with '/4 (6.4 mm) openings to "sift out'the smaller particles. The screen should be large enough (approx.1 yd2 or 1 m2) to be folded into a W" shape to allow sifting while the product is being poured into the hole. Also, HOLEPLUG bentonite should be poured slowly. Allow approximately two minutes to pour a 50-lb (22.7 kg) bag. 1. Position the screen with the lower end placed over the borehole 2. Slowly pour HOLEPLUG bentonite down the W" so that fine particles fall through the screen before the larger particles fall into the borehole 3. Fill hole as required (above static water level or to ground level) 4. Observe all regulatory specifications Stopping loss of circulation and stabilizing unconsolidated formations 1. Pull drill pipe out of hole 2. Pour HOLEPLUG bentonite into hole to fill above problem zone 3. Drill ahead slowly with reduced pump pressure Plugging flowing wells Pour HOLEPLUG bentonite into hole until water flow subsides or hole is filled to surface. Treatment Adequate annular space should be present to allow for the placement of Considerations HOLEPLUG bentonite into the area of concern without bridging. It is recommended that a minimum annular space of two inches on either side of the outside dimension of the casing be present. This will facilitate the placement of tremie lines and reduce the potential of the HOLEPLUG bentonite bridging during pouring operations. The use of this product should always correspond with applicable federal, state and local well construction guidelines. • The subsurface environment that the respective bentonite sealing material or grout is to be placed into should always be taken into consideration when selecting the appropriate material to compose the well seal. If the formation water chemistry has a total hardness of greater than or equal to 500 parts per million and/or a chloride content of greater than or equal to 1500 parts per million the use of a bentonite material may not be appropriate for this environment. In the event that questions regarding subsurface environments arise it is always best to consult your local Baroid IDP representative to determine if the Baroid product of choice is appropriate for the given conditions.