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August 2002 -14- 003 -2203 <br />• 2.3 Leak Detection System <br />Ames constructed approximately 2,276 linear feet of LDT in the Phase IVa Area, at the location <br />shown in Record Drawing No. 4. <br />Drawing 14, Detail 1 shows a typical Leak Detection Trench Section. Ames excavated the <br />trench to minimum 1-foot by 1 -foot cross - sectional dimensions, and a minimum one percent <br />grade. Ames placed geosynthetics, 4 -inch diameter perforated corrugated polyethylene (PCPE) <br />pipe, and LDF in the trench. Ames placed approximately 84 cubic yards of LDF, 6,828 square <br />feet of 40-mil smooth Linear Low Density Polyethylene (LLDPE) geomembrane, and <br />11,380 square feet of 12 -ounce non -woven geotextile in the LDT. The LDT geosynthetics <br />installation is discussed further in Section 3.2. Approximately 600 feet of LDT contained LDF <br />that did not meet project specifications. The LDF was removed and replaced with material that <br />met project specifications. <br />• 2.4 Site Grading <br />Prior to SF placement, Ames conditioned the surface of the fill. Golder monitored the <br />preparation of the subgrade and verified that it met project specifications. <br />Ames graded existing slopes and placed SF so that final slopes were no steeper than 2.5H:1V. <br />Prior to fill placement, the in -situ material was scarified to a depth of approximately 6 inches. <br />SF was compacted with a minimum of four passes of a smooth drum vibratory compactor. <br />Ames placed approximately 44I,000 cubic yards of SF for site grading. <br />• <br />1. wWM203% 1)400\catxtposo2\oo3220i .040004740mt.dm Golder Associates <br />