ARCHIVED REPORTS_2010_2 - Laserfiche WebLink

Home Browse Search

L` The land use data was collected from the Department of Water Resources, San Joaquin County Land Use, 1996. 2.1.3 Base Liner and LCRS System The design for the base liner system for the vertical expansion of NCRCSL incorporates the engineered alternative base liner system demonstrated to be satisfactory in the Demonstration report of May 2002, with adjustments for the increased fill loads (Drawings 1, 2, and 3). This approved liner system includes the following components (from bottom to top): • 1 -foot -thick compacted soil layer (typically recompacted foundation soils) • Geocomposite clay liner as an engineered alterantive to the prescriptive 2 -foot -thick low -permeability soil liner, with 10 -centimeters per second permeability • 60 -mil high-density polyethylene (HDPE) geomembrane, textured on both sides • 0.75 -foot -thick rounded gravel drainage layer • Nonwoven geotextile separator/filter • 2 -foot -thick soil operations layer The approved engineered alternative side slope liner system (Drawing 4), also demonstrated in 2002, includes the following components (from bottom to top): • Prepared subgrade • Geocomposite clay liner • 60 -mil HDPE geomembrane, textured on both sides • Geocomposite drainage layer with a nonwoven geotextile separator/filter • 2 -foot -thick soil operations layer These components are also identified in the current WDR Order under Findings, Items 52 and 53, and D: Construction Specifications, Item 2c. The landfill is developed as individually -lined modules, each constructed as needed to provide space for refuse disposal. Each of the existing modules has been constructed with liner systems that include an HDPE geomembrane and leachate collection and removal facilities. To date, refuse has been disposed in Modules 1 through 4, covering an area of approximately 52 acres (Figure 3). The landfill is currently planned to be developed in 11 modules. Development of the modules would be in the sequential, counterclockwise order. Based on the progression of site filling and capital cost expenditures, the actual size of each module may be adjusted by the County. PCMP for NCRCSL 2-2 Department of Public Works/Solid Waste GISanJoaquin CountylNCRCSL11180401PCPMPIFinalReportlPCPMP Rev_Jan_2010.Doc County of San Joaquin—January 7, 2010