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Mr. Bryce Romig Page 2 April 10, 1996 <br /> I. Drill a hole centered on and following down each vertical crack. The hole diameter <br /> should be sized to intersect the crack along its entire length. If the crack deviation is <br /> too great to cover with a single hole, multiple holes should be used. The hole should <br /> also be drilled a minimum of 2 inches below the footer and into the underlying <br /> bedrock. <br /> 2. Remove any drilling material or soil within the crack by flushing with low-pressure <br /> water. Then, using compressed air, blow the crack to remove water and debris. <br /> 3. Install and seal grout injection tube into the hole. Place tube outlet near the bottom of <br /> the drilled hole. <br /> 4. Grout the crack using a low pressure (less than 5 psi) injection pump. <br /> 5. Once the crack has been grouted and satisfactory grout return is observed at the top of <br /> the footer, grouting pressure should be held for several minutes to ensure good <br /> penetration. As the grout tube is removed from the hole, grout injection should <br /> continue to fill the void space left by the tube. <br /> The grout, at a minimum, should consist of cement which meets the requirements of <br /> ASTM C 150 Type V cement and water. Depending on the crack width, sand may also be <br /> added to the grout to improve its performance. <br /> I trust this summary and recommendation meets with your approval. If you have any <br /> questions or comments, please feel free to call me at (303) 850-9852. <br /> Respectfully, <br /> Titan Environmental Corporation <br /> John F. Lupo, Ph.D., P.E. <br /> Project Manager <br /> JFL/bsf <br /> _ _ __ ..Environmental <br />