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The second step is to continue drilling down to the injection <br /> zone. After the desired depth has been reached another string of <br /> casing is installed and cemented from the surface. The cement is <br /> placed over the entire length of the well bore. This provides <br /> two steel and two cement barriers to protect the drinking water. <br /> Fluids are then injected through a third, smaller diameter pipe, <br /> known as tubing. The tubing is secured and sealed at the top and <br /> sealed at the bottom with a packer. Pressure recording <br /> instruments are installed at the surface and continually <br /> monitored. Any leak which may occur either in the tubing or <br /> protective casings will result in a change of pressure and the <br /> well will be shut down and repaired. This insures that all <br /> wastes reach the injection zone. <br /> It is our conclusion that deep well disposal will be a safe <br /> operation based on favorable geological conditions and sound <br /> � engineering practices. Due to the quality of the injection zone, <br /> the extensiveness of the confining clay layers, and multiple <br /> steel and cement barriers the regional groundwater is properly <br /> insulated from possible contamination. <br /> WILSON ZUBLIN INC. <br />