Current through September 21, 2024
All facilities shall meet the following standards:
(a) Surveyed corners: All site boundary
corners shall be surveyed and marked with permanent survey caps.
(b) Access roads: Facility access roads shall
be constructed to enable use under inclement weather conditions.
(c) Buffer zones: All facilities shall be
designed and constructed with a buffer zone that is a minimum of twenty (20)
feet wide within the facility perimeter fence.
(d) Cover Material Availability: Facilities
shall be designed and constructed to ensure that sufficient cover material is
available to properly operate the facility through the closure
period;
(e) Surface water
structures: Surface water structures shall be designed and constructed to:
(i) prevent flow onto the active portion of
the landfill during the peak discharge from a 25-year storm;
(ii) Collect and control run-off from the
active portion of the landfill from at least the water volume resulting from a
24-hour, 25 year storm;
(iii)
Sediment control structures shall be designed and constructed in accordance
with Chapter 11 of the Water Quality Division Rules and Regulations.
(f) Performance based design: New
units and lateral expansions shall comply with the requirements set out in
W.S.
35-11-527. The administrator may approve
replacement of the two (2) foot layer of compacted soil in a composite liner
with an alternate component that performs at least as well as a two (2) foot
layer of compacted soil, such as a geosynthetic clay liner (GCL).
(g) Design/construction of engineered
containment system caps and liners:
(i)
Compacted soil barrier layers shall be constructed in lifts which do not exceed
six (6) inches in thickness, and uniform compaction of these lifts shall be
assured through the use of appropriate equipment.
(ii) All engineered containment system
components shall be supported by material of sufficient bearing strength to
prevent subsidence and failure of any component. This bearing strength shall be
documented through materials testing as approved by the
Administrator.
(iii) Synthetic
membranes used as part of any containment system shall be of a material and
thickness which is suitable for the intended use, but in no case shall be less
than 0.030 inches thick (30 mils) or 60 mils thick if the membrane consists of
high density polyethylene (HDPE). All synthetic membranes shall be underlain by
a suitable bedding material and when used with a compacted soil component, in
direct and uniform contact with the compacted soil component.
(iv) Lateral drainage layers included in
composite cap and liner system designs shall be composed of either granular
material or a synthetic drain net of suitable lateral permeability to promote
acceptable drainage, as approved by the Administrator. Lateral drainage layers
shall be protected from soil clogging by either a synthetic filter fabric or a
graded granular layer of a design approved by the Administrator.
(v) If required by the Administrator, leak
detection systems shall be designed to efficiently identify failure of the
overlying barrier layer
(h) Quality assurance/quality control
(QA/QC):
(i) QA/QC plans shall ensure adequate
construction and testing of the containment system components, including
applicable observations, inspections, tests, and measurements. Applicable
standards from the American Society for Testing and Materials (ASTM) and
Geosynthetic Research Institute (GRI) shall be used. As applicable, the QA/QC
Plans shall address:
(A)
Foundations,
(B) Compacted soil
layers,
(C) Flexible membrane
liners,
(D) Leachate collection and
removal systems including the operations/protective layer,
(E) Gas management systems,
(F) Final cover systems, and
(G) Other components as required by the
Administrator.
(ii) For
compacted soil layers describe how moisture content will be maintained or
adjusted, the technique by which lift thickness will be maintained, the manner
in which lifts will be compacted, the method used to measure moisture content
and density in the field during construction, and the frequency of moisture
content and density testing.
(iii)
For synthetic membranes describe the method used to test 100% of all seams for
leaks, the frequency of destructive testing for seam strength, the procedure to
be followed for post-installation defect identification and repair, the results
of testing or literature review which demonstrates the compatibility of the
membrane material with the waste and/or waste leachate, and the procedures used
to ensure each roll of membrane material meets the manufacturer's
specifications for material properties.
(iv) For lateral drainage layers describe the
method used to ensure achievement of the approved grain size uniformity and
layer thickness for granular layers, the method by which drainage layers shall
be installed without damaging any imbedded leachate collection system, leak
detection system or membrane, and the installation procedure for the filter
fabric or granular filter layer overlying the drainage layer.
(v) Identify key personnel, their
qualifications, and their role in the development and implementation of the
QA/QC Plan.
(vi) After construction
is complete the owner or operator shall submit a certification, signed by an
engineer licensed to practice in Wyoming, that the approved QA/QC plan has been
carried out and that the unit meets the requirements of this section.
Documentation supporting the engineer's certification shall be submitted with
the certification. Wastes shall not be accepted in the newly constructed unit
without written authorization from the Administrator. Copies of the engineer's
certification and supporting documentation shall be maintained in the operating
record.
(i) Slope
stability for excavations: Trench walls shall not exceed a ratio of 1.5:1
(horizontal:vertical) unless a slope stability analysis demonstrates steeper
slopes can be safely constructed and maintained. This analysis may be based on
site specific soil stability calculations or Wyoming Occupational Safety and
Health Administration regulations for excavations.
(j) Methane control systems for on-site
structures: All structures on the landfill facility will be designed to prevent
the accumulation of methane such that the concentration of methane gas in
facility structures does not exceed twenty-five percent (25%) of the lower
explosive limit (LEL) for methane.
(k) Landfill gas management systems: If
required, the permit application shall include landfill gas management system
design and construction information.
