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June 24,2003 -12- 003-2203.7 <br />• Detail 1. Ames excavated the PU trench to the minimum dimensions, and placed geotextile and OF in <br />the trench. Ames placed SSF over the geotextile to a minimum depth of 6 inches. The PU geosynthetic <br />installation is discussed further in Section 3.1. Approximately 1,472 cubic yards of UF, 245 cubic yards <br />of SSF, and 53,000 square feet of geotextile were used to construct the PU. The PU is sloped at a <br />minimum of one percent from the PSSA sump area southward beyond the east end berm, and west from <br />the sump on the floor of the PSSA to the south of the west end berm extending into the Phase Nb OSA. <br />2.2.2 Secondary Underdrain <br />Ames constructed approximately 630 linear feet of SU in the Phase Nb PSSA. Record Drawing <br />No. 2 shows the location of the SU. The cross-sectional dimension of the SU was nominally 4 feet <br />wide by 2 feet deep, providing across-sectional azea of 8 square feet, as shown on IFC Drawing 13, <br />Detail 2. Ames excavated each SU trench to the minimum dimensions, and placed geotextile and OF in <br />the trench. Ames placed SSF over the geotextile to a minimum depth of 6 inches. The SU geosynthetic <br />installation is discussed further in Section 3.1. Approximately 186 cubic yards of UF, 47 cubic yards of <br />SSF, and 12,600 square feet of geotextile were used to construct the Secondary Underdrains. <br />• 2.3 Leak Detection System <br />Ames constructed approximately 2,740 linear feet of LDT in the Phase Nb PSSA, at the location <br />shown in Record Drawing No. 4. <br />IFC Drawing 14, Detail I shows a typical Leak Detection Trench Section. Ames excavated the trench <br />to a minimum 1-foot by 1-foot cross-sectional dimension, and a minimum one percent grade. Ames <br />placed geosynthetics, one 4-inch diameter perforated corrugated polyethylene (PCPE) pipe, and LDF <br />in the trench. Ames placed approximately 101.5 cubic yards of LDF, 8,220 square feet of 40-mil <br />smooth Low Linear Density Polyethylene (LLDPE) geomembrane, 13,700 square feet of 12-ounce <br />non-woven geotextile, and 2,740 linear feet of PCPE in the LDT. The LDT geosynthetics installation <br />is discussed further in Section 3.2. <br />The LDT trench crossed the SU four times. In these cases, the cross-section was constructed the <br />same as above, except the 40-mil LLDPE geomembrane was placed on the upgradient, bottom and <br />downgradient sides of the LDT as shown on Detail 1 of IFC Drawing No. 14. <br />• <br />z:~ooazoz~awo~r~ic~rtessaosw~ao3zzo3.oaoo.oonuRepao~ Golder Associates <br />