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<br />Matthew/ Aley Residence <br />Summary Report of Monitoring of <br />Subsurface Compaction and Chemical Grouting <br /> <br />BCI Project No. 03-15564.1 <br />June 2008 <br />Page 4 <br /> <br />2.2 Subsurface Chemical Grouting <br /> <br />In addition to the subsurface compaction grouting program, shallow polyurethane grouting <br />was utilized to strengthen and densify the loose soils underlying the house foundation. Uretek ICR, <br />LLC, performed the polymer grouting on May 16, 2008. Uretek injected specifically formulated <br />hydrophobic polyurethane expansive foam into small diameter (3/8-inch) copper pipes located at a <br />spacing of approximately 4 to 5 feet and extending approximately 5 feet below the existing ground <br />surface. A total of210.6 pounds of polyurethane grout was injected into 7 holes along the north side <br />ofthe house; 240.0 pounds of polyurethane grout was injected into 8 holes along the east side of the <br />house; 235.2 pounds of polyurethane grout was injected into 8 holes along the south side of the <br />house; and 153.6 pounds of polyurethane grout was injected into 7 holes along the west side ofthe <br />house. A total of839.4 pounds of polyurethane grout was injected into 30 holes around the outside <br />perimeter of the house. <br /> <br />2.3 Conclusions <br /> <br />Based on BCl's monitoring of the grouting operations, it is our opinion that the grouting <br />program was completed in general accordance with industry standards and our recommendations. <br />The results of our observations appear to indicate that at the time the work was completed, the <br />sinkhole activity as well as the shallow loose soils at the above referenced site had been stabilized. <br />