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CMC001614 <br />Mr. Bryce Romig Page 2 April 10, 1996 <br />1. 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 />i s <br />• <br />E <br />Environmental <br />