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<br />0 <br />ameO <br />2.2.2 Secondary Underdrain <br />Ames constructed approximately 198 linear feet of Secondary Underdrain in the 2010 Phase <br />5 VLF. Record Drawing No. 2 shows the location of the Secondary Underdrain. The <br />cross-sectional dimension of the secondary Underdrain was nominally 4 feet wide by 2 feet <br />deep, providing a cross-sectional area of 8 square feet, as shown on IFC Drawing A260. Ames <br />excavated each Secondary Underdrain trench to the minimum dimensions, and placed <br />geotextile and OF in the trench. Ames placed SSF over the geotextile to a minimum depth of <br />6 inches. The Secondary Underdrain geosynthetic installation is discussed further in <br />Section 3.1. Approximately 59 cubic yards of UF, 15 cubic yards of SSF, and 2,376 square <br />feet of geotextile were used to construct the Secondary Underdrains. <br />2.3 Closure Drains <br />2.3.1 North Closure Drains <br />Ames constructed two Closure Drains under the north end of the Phase 5 PSSA shown on <br />IFC Drawing A244. The cross-sectional dimension of the each Closure Drain was nominally <br />50 feet by 50 feet wide by 3 feet deep, providing a volume of 7,500 cubic feet, as shown on IFC <br />Drawing A355. Ames excavated each Closure Drain to the minimum dimensions, and placed <br />geotextile and OF in the Closure Drain. Ames placed SF over the geotextile to a minimum <br />depth of 3 feet. The Closure Drain geosynthetic installation is discussed further in Section 3.2. <br />Approximately 556 cubic yards of UF, 556 cubic yards of SF, and 10,000 square feet of <br />geotextile were used to construct the Closure Drains. - <br />2.3.1 South Closure Drain <br />At the south end of the Phase 5 PSSA an area has been designated for a closure drain as <br />shown as shown on IFC Drawing A244. The area is approximately 65 feet by 55 feet and <br />resides over the Phase IVa VLF. At closure this area will be punctured and allowed to drain <br />into the Phase IVa VLF. <br />AMEC Earth & Environmental, Inc. <br />2000 S. Colorado Blvd 2-1000 <br />Denver, CO 80222 <br />Tel 303-935-6505 <br />Fax 303-935-6575 www.amec.com <br />13