Two permits relevant to landfills are identified and mandated by thes
criteria: the National Pollutant Discharge Elimination System (NPDES)
permit (402 and 404), and the Amy Corps of Engineers Permit. The NPDES
permit is required for location of a landfill in waters of the United
States. It is also required for any point source discharges from sanitar
landfills, such as from leachate collection systems. Army Corps of
Engineers permit is required for the construction of any levee, dike, or
other type of containment structure to be placed at a sanitary landfill
located in waters of the United States.
7.4.3 Design Methodology and Data Compilation. Adherence to a carefully
planned sequence of activities to develop a landfill design minimizes
project delays and expenditures. A checklist of design activities is
presented in Table 16, to aid in planning the design effort. These
activities are listed in their general order of performance, but the orde
can vary considerably from site to site and from jurisdiction to
jurisdiction, depending on specific conditions.
As shown in Table 16, initial tasks consist of compiling existing
information and generating new information on solid waste characteristics
and site conditions. Obviously, some of this information would have alre
been collected in the site selection phase. Generally, additional and mo
detailed information will have to be collected in the design phase. A
listing of possible sources for existing information is shown on Table 17
A summary of methods to obtain new information is shown on Table 18.
Throughout the design phase, it is advisable to periodically contact
regulatory agency representatives who participated in the site selection
process to ensure that the design will meet any new requirements and
procedures for permit application submittals. Maintenance of close liais
with state and local regulatory officials throughout the design effort is
helpful in securing a permit without excessive redesigns, especially at a
time when environmental protection legislation and regulations are rapidl
changing.
Two general types of design packages are prepared for a sanitary
landfill: conceptual or preliminary design plans, and construction
documents. Conceptual design plans normally consist of the following
elements provided in sufficient detail to describe proposed filling plans
to regulatory agencies and the public. The conceptual design can also se
as a guide for landfilling operations in the event that design constructi
drawings are not required. Conceptual design plans include:
a) An installation map showing existing site conditions. The map
should be of sufficient detail, with contour intervals of 1 foot (0.3
meter) to 5 feet (1.5 meters) and a scale of 1 inch = 50 feet (10
millimeter = 6 meters) to 1 inch = 200 feet (10 millimeter = 24 meters),
depending on the steepness of the terrain and size of the landfill,
respectively.
b) A site preparation plan locating the areas and depths designated
for cover soil excavation and soil stockpile deposits. Also shown are si
facilities locations such as structures, access roads, and utilities.
c) Development plans showing final filling and excavation contours.
Development plans should show interim (4- to 6-year) filling and excavati
contours if a long-lived site is planned.
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