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2002 -14- <br />• 2.3 Leak Detection System <br />003-2203 <br />Ames constmcted approximately 2,2761ineaz feet of LDT in the Phase Na 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-secfional 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 yazds of LDF, 6,828 squaze <br />feet of 40-mil smooth Lineaz Low Density Polyethylene (LLDPE) geomembrane, and <br />11,380 squaze 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 />prepazation 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.SH:1 V. <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 441,000 cubic yazds of SF for site grading. <br /> <br />ctoouzo~~oaoo~~n,a~,osoz,oo3:zo3 oaoo oa>aan.m~ Golder Associates <br />