l Design of Landfill Facilities
5.1 Introduction
Conceptual
design phase
The Site Development Plan provides the framework for establishing overall goals
for facility design, construction, operation, and environmental monitoring. This
section describes the methods and procedures for establishing appropriate design
criteria and selecting technologies that will satisfy regulatory requirements and
performance objectives.
How to
respond
Prepare a comprehensive Site Development Plan that presents the conceptual
design of landfill facilities and environmental control systems and documents the
analysis used to select the proposed technologies. The plan should be prepared by
or under the direct supervision of a professional engineer with current Oregon
registration.
Plan content
The Site Development Plan should describe the elements in this subsection. The
plan should be stamped by the professional engineer responsible for its preparation.
Following the organizational format of this guidance will expedite Department
review of the plan.
In this section
This section describes the elements of a Site Development Plan, including: facility operation conceptual design of landfill facilities leachate management surface water management landfill gas management environmental monitoring closure and end use supporting information Solid Waste Landfill Guidance Section 5
Page 5-2
5.2 Facility Operation
Facility
operation
Describe the existing and proposed facilities, anticipated waste stream
characteristics, and operational procedures, including the items in this subsection.
Capacity and
projected life
Specify the proposed capacity and projected life of the site.
Population to
be served
Identify and list the communities expected to be served by the facility, and estimate
their corresponding current populations. Describe how the listing was compiled.
Cite all sources used to estimate population.
Industry to be
served
Identify and list major industries to be served by the landfill, and describe how the
listing was compiled.
Rate of waste
disposal
Estimate the future flow of waste to the facility from communities and industries
served and from any other projected sources. Include estimates for maximum
daily, maximum monthly and average annual volume and weight of waste to be
received. Cite all sources used to calculate volume and weight estimates.
Overall
description of
operation
Describe the operation including on-site equipment on site (i.e., compactors,
dozers, grinders or chippers), anticipated hours of operation, and mode of delivery
of solid waste to the site.
Site economic
viability
Provide key assumptions used to calculate the economic viability of the proposed
facility.
Site screening
Describe how the active landfill area(s) will be screened from public view.
Reference: OAR 340-94-040(11)(f) Solid Waste Landfill Guidance Section 5
Page 5-3
Planned future
use
Describe the planned future use of the disposal site after closure.
Waste stream
types
List and estimate the quantity of each type of waste stream projected to be
disposed of at the facility.
Examples: domestic wastes, commercial and institutional wastes, industrial wastes,
construction and demolition wastes, agricultural wastes, sewage sludge and grit,
contaminated cleanup materials, other wastes requiring special handling [see OAR
340-94-040(11)(b)(J)]
Acceptance of
industrial
waste
If proposing to accept industrial wastes for disposal, report the major industrial
waste stream(s). For each weight or volume calculation, treat as one waste stream
all industrial waste generated from industries identified by the same first three digits
in their Standard Industrial Classification (SIC) code.
Example: Spent casting sand from an aluminum foundry and spent casting sand from
a nonferrous foundry should be treated as one waste stream since they are
generated from industries having the same first three digits in their SIC code.
Definition: a "major" industrial waste stream comprises greater than one-quarter
percent, by weight or volume, of the total estimated waste flow.
Regional
facility
If the facility is a regional disposal site, discuss the following: plans from the local board of county commissioners for establishing a local
citizens advisory committee how the information necessary for the Department to review and approve a
Waste Reduction Program for any person who will send more than 75,000 tons
of solid waste a year to the site will be submitted, and how the county, state and country of origin of the waste will be tracked Solid Waste Landfill Guidance Section 5
Page 5-4
5.3 Phased Development of Landfill Facilities
Phased
development
Describe the phased development of the landfill. Establish a systematic blueprint of
the construction, operation, and closure of each major phase of development.
Contents
Address the following elements in the design: design criteria used to determine the landfill's size, configuration, capacity,
location, and environmental protection features design, construction, and operation considerations for initial cell development individual cell construction and the fill sequence slope stability in relation to construction, fill sequence, and side-slope liner design facility development drawings utility requirements including electrical power, water supply, and wastewater
treatment and disposal earthwork materials for site construction and development, and environmental control technologies
Design criteria
Define the basis and any assumptions used to establish the landfill's footprint
boundaries, overall configuration, capacity, and location considering at least the
following factors: regulatory standards for location, design, and operation waste stream characteristics waste processing (e.g., incineration, composting, shredding) buffer zone requirements surface drainage patterns and physical characteristics of the site slope limitations on the landfill base and final cover profile land use and zoning restrictions location of utilities and support facilities transportation and access patterns environmentally sensitive areas geotechnical and hydrogeologic constraints, and end use alternatives Solid Waste Landfill Guidance Section 5
Page 5-5
Facility
development
drawings
Prepare a series of scaled drawings showing the phased development of the site.
Show each phase of landfill cell(s) development and site status when new cells are
ready to be placed into service. The drawings should include at least one scaled
plan-view and two perpendicular cross-sectional drawings of the excavation plan,
fill sequence plan, and final grading plan.
Content of
drawings
Identify the following information on the drawings: environmental monitoring components including groundwater monitoring wells,
and gas monitoring probes, and surface water monitoring stations layout of landfill components including support facilities (e.g., public receiving and
recycling areas) entrance and on-site roads, gates and fencing site drainage and surface water control structures (e.g., berms, dikes, ditches,
culverts) surface impoundments soil stockpiles (i.e., the extent, available volume, and intended use of each soil,
sub-soil, or rock unit identified as a borrow source) leachate collection, storage, treatment and disposal facilities special waste management areas (e.g., tires, bulky wastes, asbestos) planned total landfill footprint including buffer zones, landscaping, and site
screening features planned excavations and base grades for each major phase of site development,
relationship to hydrogeologic features (e.g., watertable profile, water bearing
formations) configuration of the completed landfill and final grading plan the final landfill surface profile and its internal components, existing topography,
and underlying geology/hydrogeology (in landfill cross-section views) existing landfill cells, including their operational status and configuration (e.g.,
exposed waste, intermediate cover, final cover, leachate drainage layer), and gas control system components
Earthwork
materials for
construction
and
development
Inventory on-site borrow materials and characterize their intended use as follows: analyze the results of the Phase I and Phase II geotechnical investigations and
identify the intended uses of borrow materials quantify the available borrow materials describe the management and storage of soils and other construction materials Solid Waste Landfill Guidance Section 5
Page 5-6
5.4 Leachate Management
Leachate
management
Describe the proposed leachate management strategies for the landfill's active
operation, closure and post-closure stages.
Strategies
The leachate management strategy should be based on a systematic analysis of
design, construction, and operation techniques, and the following objectives: accurately predict leachate quality and quantity select leachate control methods that are technically and economically sound maximize leachate containment and collection efficiencies (through liner system
and collection and removal system design) maximize the reliability of leachate containment systems monitor the effectiveness of leachate control systems treat and dispose of leachate in an environmentally sound manner, and minimize leachate generation
Leachate
management
analysis
Perform a conceptual design analysis to evaluate background data, establish a
rational basis for design, and to evaluate the performance and cost effectiveness of
alternative technologies. This analysis should