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W. MICHAEL CARROLL, PE <br />COUNTY OF SAN JOAQUIN DEPARTMENT OF PUBLIC WORKS <br />DECEMBER 22, 2009 <br />Module I <br />The existing base liner system within Module 1 consists of the following components (starting from the <br />bottom): <br />• 6 -inch compacted soil Layer <br />• 60 -mil smooth HDPE geomembrane <br />• Geonet <br />• 10 ounce per square -yard (oz/yd2) non -woven geotextile <br />• 24 -inch operations layer <br />Critical Interfaces: <br />— Smooth HDPE geomembrane-geonet <br />— Geonet-geotextile <br />The sideslope liner system consists of the following components (starting from the bottom): <br />• 6 -inch compacted soil layer <br />• 60 -mil smooth HDPE geomembrane <br />• 24 -inch operations layer <br />Critical Interfaces: <br />— Smooth HDPE geomembrane-operations layer <br />Module 3 <br />Base liner system (starting from the bottom): <br />• 6 -inch compacted soil layer <br />• Geosynthetic clay liner (GCL) <br />• 60 -mil single -side textured HDPE geomembrane (textured side facing the GCL) <br />• Geonet <br />• 10 oz/yd2 non -woven geotextile <br />• 24 -inch operations layer <br />Critical Interfaces: <br />— GCL-textured side of HDPE geomembrane <br />— Smooth side of HDPE geomembrane-geonet <br />Geonet-geotextile <br />Sideslope liner System (starting from the bottom): <br />• 6 -inch compacted soil layer <br />• 80 -mil single -side textured HDPE geomembrane (textured side facing the compacted soil) <br />• Geonet <br />• 10 oz/yd 2 non -woven geotextile <br />PAGE 3 <br />