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16.1 FOUNDATION SOIL LAYER PREPARATION <br /> The surface soil in the closure cap extension area will be removed expose the <br /> foundation layer. The surface of the foundation layer will be graded relatively <br /> even, with no sharp grade breaks or objects, and compacted smooth with a <br /> minimum slope of two percent away from the landfill. Soil excavated during <br /> foundation layer preparation will be stockpiled near the entrance gate of the landfill <br /> and later used as vegetative cover. <br /> 16.2 GCL BARRIER <br /> GCL will abut the existing closure cap (Plan Sheet 3 and 5). GCL will be placed <br /> per COA specifications. <br /> 16.3 VEGETATIVE LAYER <br /> A vegetative soil layer will be placed over the GCL. Stockpiled soil, from the sub- <br /> grade excavation, will be used for vegetative cover. Additional soil will be <br /> excavated from on-site retention pond 1 (Plan Sheet 2). Water trucks will provide <br /> dust control and moisture as needed. The final surface of the extension cover <br /> area will be compacted, per COA specifications, and graded to the required slope. <br /> 2.0 CONSTRUCTION QUALITY ASSURANCE <br /> As identified in section 8.0, a COA plan has been prepared for the closure cap extension <br /> project (Appendix 1 ). The cost estimate for the COA is based on other projects. <br /> 3.0 REVEGETATION <br /> The closure cap extension area will be seeded with grass seed or hydroseeded to <br /> establish vegetation. Cost estimates for re-vegetation are based on bids received from a <br /> local seeding contractor. <br /> 4.0 LANDFILL GAS MONITORING AND CONTROL <br /> Two new LFG wells will be installed, and connected to the existing LFG system. <br /> Closure Plan Revised Addendum San Joaquin County <br /> Corral Hollow Sanitary Landfill 9 Department of Public Works <br /> October 6, 2011 Solid Waste Division <br />