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6 FACILITIES CONSTRUCTION AND DESIGN 6.1 SITE PLAN The site plan delineating the landfill property boundary and footprint of the landfill is shown on Plate 2. This plan displays closed areas as well as future fill areas. 6.2 INTRODUCTION San Joaquin County submits engineering designs and plans for each unit to the regulatory agencies for their review and approval prior to construction. The design of each new cell complies with Title 27 and Subtitle D construction and design standards. Detailed procedures for construction are presented in the construction drawings and specifications developed for each cell. Likewise, a detailed description of the quality control and quality assurance procedures that will be employed during final cover construction is provided in the CQA plan included with the cell design. 6.3 DESIGN PLANS 6.3.1 Previous Designs • Modules 1 and 2 were constructed as a single module in 1991. This module is provided with a 60-mil HDPE liner installed over a 6-inch (minimum) thick layer of compacted native soil. The side slopes are provided with a non-woven geofabric over HDPE liner. The base is provided with a geonet drainage layer for the collection of leachate. An operations soil layer, not less than 2 feet thick, was placed on the side-slopes and base prior to the placement of refuse. Leachate drains through the geonet to shallow gravel- filled "V" ditches which drain the leachate through pipes out a sump at the south east corner of Module 2. • Module 3 was constructed in 1995. The base of this module is covered with a composite liner consisting of a geosynthetic liner (GCL) under a 60 mil HDPE membrane. The GCL extends under the HDPE approximately 6 feet up the side-slopes. The side sloes are protected by 80 mil HDPE over a minimum 6-inch layer of compacted soil. Base and North County RC&SL Page 26 of 48 Public Works/Solid Waste JTD County of San Joaquin—November 30,2004