5. Engineering
Report. In addition to the permitting requirements outlined for Class Three
Landfills in this Part, the permit application shall contain, at a minimum, the
following:
a. Engineering drawings with
detailed plans of the landfill that clearly show in plan and cross-sectional
views the following: each leachate injection well; pipe lines; pipe inverts;
drainage envelopes; manholes; cleanouts; valves; sumps; other devices as needed
for leachate injection and monitoring, if applicable; and, a proposed waste
saturation profile;
b. An
engineering report containing a description of the existing site conditions and
an analysis of the proposed landfill. The report shall:
(1) Contain design calculations using waste
shear strength at 100% saturation that demonstrate that all containment
structures, including liners, leachate collection systems, and surface water
control systems, are designed to resist the maximum horizontal acceleration in
lithified earth material for the site. Class Three landfills shall have a
minimum 1.7 safety factor against failure, where the soil conditions are
complex and when available strength data do not provide a consistent, complete,
or logical picture of the strength characteristics. Where the soil conditions
are uniform and high quality strength data provides a consistent, complete, and
logical picture of the strength characteristics as determined by the
Department, a minimum 1.2 safety factor against failure shall be
used.
(2) Specify the leachate
application rate of the landfill in gallons per day, specify the current
leachate generation rates, and list the number, types, and specifications of
all necessary machinery and equipment needed to effectively operate the
application system at the landfill.
(3) Contain liner and leachate collection
system efficiencies calculated using an appropriate analytical or numerical
assessment. The factors to be considered in the calculation of collection
system efficiency shall include, at a minimum, the saturated hydraulic
conductivity of the liner, the liner thickness, the saturated hydraulic
conductivity of the leachate collection system, the leachate collection system
porosity, the base slope of the liner and leachate collection and removal
system interface, the maximum flow distance across the liner and leachate
collection and removal system interface to the nearest leachate collection
pipe, the estimated leachate generation, including both natural quantity and
the approved injection rate. The estimated leachate generation shall be used to
predict the static head of leachate on the liners, volume of leachate to be
collected, and the volume of leachate that may permeate through the entire
liner system on a monthly basis. This assessment shall also address the amount
of leachate expected to be found in the leachate collection and removal system
in gallons per acre per day.
(4)
Contain a leachate recirculation operation and maintenance report for the
landfill that includes, at a minimum, the following:
(a) A description of the project's personnel
requirements, stating personnel responsibilities and duties including
discussions for training and lines of authority at the landfill; and,
(b) A description of all machinery and
equipment to be used at the landfill for leachate recirculation, their
authorized uses, and safety features.
(5) Contain a contingency plan discussing the
course of action to be taken in responding to fires, leachate seeps, leachate
releases, and other pertinent situations.
(6) Contain a description of the method for
collecting and controlling landfill gases based on calculations of the
estimated landfill gas generation during life of the landfill.
(7) Contain a demonstration of adequate
storage capacity for all leachate generated at the site.
(8) Contain analytical results from leachate
testing for the parameters specified in Appendix VI. prior to the start of
leachate recirculation at the site.