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June 24, 2003 -19- <br />. 3.0 GEOSYNTHETICS INSTALLATION <br />003-2203.7 <br />Geosynthetics installed in the Phase Nb PSSA consisted of geotextile, geogrid, Geocomposite Clay <br />Liner (GCL), and geomembrane. Twelve-ounce, non-woven geotextile manufactured by Amoco <br />Fabrics and Fibers Company (Amoco) of Austell, Georgia was used to construct the UD trenches of <br />the Phase Nb PSSA. Twelve-ounce, non-woven geotextile manufactured by Amoco, 4-inch PCPE <br />piping, and 40-mil smooth LLDPE geomembrane manufactured by Poly-Flex of Grand Prairie, Texas <br />were used to construct the LDT for the Phase Nb PSSA. The Phase Nb PSSA double liner system <br />included 100-mil single-sided textured LLDPE geomembrane, 100-mil double-sided textured LLDPE <br />geomembrane, and 100-mil smooth LLDPE geomembrane manufactured by Poly-Flex of Grand <br />Prairie, Texas. GCL manufactured by Cetco of Lovell, New York, was used for construction of the <br />PSSA riser foundation. Geogrid manufactured by TENSAR was used in the remediation of select <br />underground workings as described in Section 2.1. <br />3.1 Underdrains <br />. Geosynthetics installation for the Primary and Secondary Underdrains was performed by Ames, and <br />included deployment of 12-ounce non-woven geotextile. Ames installed approximately <br />65,600 square feet of geotextile to construct the Underdrains. Underdrain construction is discussed <br />further in Section 2.2. <br />3.2 Leak Detection Trench <br />Ames installed 12-ounce non-woven geotextile and 40-mil smooth LLDPE geomembrane in the LDT <br />beneath the Phase Nb PSSA. Ames installed approximately 13,700 square feet of geotextile and <br />8,220 square feet of geomembrane for the LDT. To construct the LDT, Ames placed a layer of <br />40-mil smooth LLDPE geomembrane in the LDT, and placed geotextile over the geomembrane. <br />After piping and LDF were placed in the trench, the geotextile was wrapped around the fill with a <br />minimum I-foot overlap, as shown in Detail 1, IFC Drawing 14. If the LDT crossed any underdrain, <br />Ames placed additional 40-mil smooth LLDPE geomembrane upgradient and downgradient at the <br />crossing, as described in Detail 1, IFC Drawing 14. Poly-Flex extrusion welded geomembrane seams <br />in the LDT. Construction of the LDT is discussed further in Section 2.3. <br />I• <br />^~ao~zzos~oaao~r~iCmrssnosonamno3.oaaa.o~s,ax..paoc Golder Associates <br />