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After the collar and liner are in place and the pilot hole was completed, raise boring methods were used to complete <br />• the hole. The hole was reamed to a final diameter of 4.33' and a 48" diameter steel casing was cemented in place <br />from 50' below the bonom of Twentymile Sandstone to the top of the concrete centering pad. The remainder of the <br />casing below the cement hangs in the hole. The hole is approximately ],100 feet in depth. The 4' diameter casing <br />extrudes 4" to 6" out of the concrete surface pad. A cap to regulate intake air flow was installed. A fence was <br />installed around the drill pad to prevent access by cattle, after completion of the hole. <br />Access was derived from an existing light-use road running up to an old electrical borehole. A series of culverts <br />were placed under the existing road and their locations shown on Figure 23, General Location of Escape Shafi. The <br />design for the culverts can be found in Exhibit 8D, Escape Shaft/Light-Duty Road Culvert Design. TCC <br />constructed an additional 25-foot wide road at a 4% grade to access the site. The ],300-foot long road is graveled <br />with 0.5' of 6-inch pit run gravel. <br />• <br /> <br />TR 01-39 2.05-45.3 9/17/01 <br />