Landfill design is a complex process involving disciplines such as geomechanics, hydrology, hydraulics, wastewater treatment, and microbiology. Design goals can include the following (Walsh and O'Leary 1991c):

• Protection of groundwater quality

• Protection of air quality

• Production of energy

• Minimization of environmental impact

• Minimization of disposal costs

• Minimization of dumping time for site users

• Extension of site lifetime

• Maximum use of land upon site closure

Planners must consider the final use of the landfill site during the design process to ensure that landfill design and operation are compatible with the end use.

Table 10.13.2 summarizes the sanitary landfill design steps. Table 10.13.3 summarizes the landfill design factors. Procurement of the requisite permits can take several years, thus the design process, an integral part of any application, should be started long before the current disposal option is scheduled to close.

The design package includes plans, specifications, a design report, an operator's manual, and cost estimates (Walsh and O'Leary 1991b). An important part of landfill design is the development of maps and plans which describe the landfill's construction and operation, including the location map, base map, site preparation map, devel-

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