Table 10132 Sanitary Landfill Design Steps

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1. Determination of solid waste quantities and characteristics a. Existing b. Projected

2. Design of filling area a. Selection of landfilling method based on site topography, bedrock, and groundwater b. Specification of design dimensions: cell width, length, and depth; fill depth; liner thickness; interim cover thickness; and final cover thickness c. Specification of operational features: method of cover application, need for imported soil for cover or liner, equipment requirements, and personnel requirements

3. Design features a. Leachate controls b. Gas controls c. Surface water controls d. Access roads e. Special working areas f. Special waste handling g. Structures h. Utilities i. Convenience center j. Fencing k. Lighting l. Washracks m. Monitoring facilities n. Landscaping

4. Preparation of design package a. Development of preliminary site plan of fill areas b. Development of landfill contour plans: excavation plans; sequential fill plans; completed fill plans; fire, litter, vector, odor, surface water, and noise controls c. Computation of solid waste storage volumes, cover soil requirement volumes, and site life d. Development of final site plan showing normal fill areas; special working areas (i.e., wet weather areas), leachate controls, gas controls, surface water controls, access roads, structures, utilities, fencing, lighting, washracks, monitoring facilities, and landscaping e. Preparation of elevation plans with cross sections of excavated fill, completed fill, and phase development of fill at interim points f. Preparation of construction details: leachate controls, gas controls, surface water controls, access roads, structures, and monitoring facilities g. Preparation of ultimate landuse plan h. Preparation of cost estimate i. Preparation of design report j. Preparation of environmental impact assessment k. Submission of application and obtaining required permits l. Preparation of operator's manual

Source: Data from P. Walsh and P. O'Leary, 1991, Landfill site plan preparation, Waste Age 22, no. 9: 97-105 and E. Conrad et al., 1981, Solid waste landfill design and operation practices, EPA draft report, Contract no. 68-013915.

opment plans, cross sections, phase plans, and the completed site map (Walsh and O'Leary 1991c).

The location map is a topographic map which shows the relationship of the landfill to surrounding communities, roads, etc. The base map usually has a scale of 1 in to 200 ft and contour lines at 2 to 5 ft intervals. It includes the property line, easements, right-of-ways, utility corridors, buildings, wells, control structures, roads, drainage ways, neighboring properties, and land use. The site preparation map shows fill and stockpile areas and site facilities. The landfill should be designed so that the excavated material is used quickly as cover. Development plans show the landfill base and top elevations and slopes. Cross sections at various places and times during the landfill lifetime should also be developed. Phase plans show the order in which the landfill is constructed, filled, and closed. The completed site map shows the elements of the proposed end use and includes the final landscaping. Construction details should be available detailing leachate controls, gas controls, surface water controls, access roads, structures, and monitoring facilities.

Equally important as the design maps is the site design report, which describes the development of the landfill in sequence (Walsh and O'Leary 1991b). The four major elements of the design report are:

• Site description

• Design criteria

• Operational procedures

• Environmental safeguards

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Homeowners Guide To Landscaping

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