Laserfiche WebLink
0 8.3 Geomembrane Liners in future Modules <br />[7 <br />To allow for the possible use of crushed rock in the drainage layer in the future modules, <br />the puncture protection calculations have been performed for both crushed gravel and <br />rounded gravel. The maximum fill height within the future modules is 255 feet. <br />8.3.1 Puncture Protection against Crushed Gravel <br />It is possible that crushed stone may be used for the drainage layer within the future <br />Modules 5 through 11. The crushed gravel is likely to be obtained from the Foothill <br />Sanitary Landfill site. Crushed gravels have angular surfaces and therefore require a <br />geotextile cushion between the gravel and the. geomembrane. The puncture protection <br />calculations assuming crushed gravel are included in Attachment G. These calculations <br />show that a 16-oz/yd2 geotextile will be adequate to protect the geomembrane from the <br />crushed gravel. <br />8.3.2 Puncture protection against Rounded Gravel <br />The puncture protection calculations assuming rounded gravel are included in <br />Attachment G. These calculations show that a 16-oz/yd2 geotextile will be adequate to <br />protect the geomembrane from the crushed gravel. To be conservative, sub -rounded <br />gravel has been assumed in the calculations. The calculations show that a geotextile <br />cushion is not required if rounded gravel is used for the drainage layer. <br />Geotechnical Analyses for NCRCSL <br />Shaw Environmental, Inc. <br />M-9 <br />Department of Public Works/Solid Waste <br />County of San Joaquin, December 12, 2007 <br />