Wisconsin Administrative Code › Department of Natural Resources › NR 500-599 - Environmental Protection - Solid Waste Management › Chapter NR 514 - Plan Of Operation And Closure Plans For Landfills › Section NR 514.07 - Miscellaneous requirements for plans of operation

Current through June 24, 2024
The plan of operation for all new landfills and expansions
				  of existing landfills shall include the following information where
				  applicable:
(1) GEOSYNTHETICS
				REQUIREMENTS. The plan of operation for any landfill which includes a composite
				liner, composite capping layer or utilizes a geomembrane for a liner or
				utilizes a geomembrane or geomembrane-GCL for a capping layer shall provide the
				following design details and specifications for the geosynthetic components.
				The department may specify additional requirements for other geosynthetic
				materials used in significant structural features of the landfill.
(a) A description of the proposed
				geomembranes, GCLs and other geosynthetics to be used in construction of the
				landfill, including resins and additives, physical properties, bentonite
				characteristics, chemical resistance properties and potential suppliers. For
				GCLs, this shall include identification of the geotextile properties and
				reinforcement.
(b) Design
				calculations that demonstrate the stability of the landfill and its components
				against failure along potential failure surfaces, such as the leachate
				collection system and final cover, during operations as well as after closure.
				Potential failure surfaces considered shall include the interfaces both below
				and above the geomembrane in the liner and final cover. Potential failure
				scenarios considered shall include both saturated and unsaturated conditions
				for the cover. The design calculations may use typical data or specifications
				from technical literature rather than values from testing of site specific
				materials if the sources of the typical data or specifications and the test
				methods used to generate them are cited with the calculations and a safety
				factor of at least 1.3 is used to assess stability.
(c) Construction methods and supervisory
				controls for preparing the surface of the topmost lift of compacted clay prior
				to the installation of a geomembrane or soil barrier layer prior to
				installation of a GCL. The plan of operation shall propose inspection methods
				and removal of coarse gravel or cobbles after rolling the topmost lift of
				compacted clay or soil barrier layer to achieve a smooth surface.
(d) A description of measures to be taken to
				store and protect all geomembranes, GCLs and geocomposite drains, transport
				geomembrane, GCL and geocomposite drain panels from storage to the working
				area, and construction methods to be used to place geomembrane, GCL and
				geocomposite drain panels.
(e) The
				proposed orientation of all geomembrane and GCL panels for the landfill liner
				and capping layer in relation to slope, collection trenches, penetrations,
				anchor trench and phase boundaries, seaming methods and phased
				construction.
(f) Typical design
				details of geomembrane and GCL seams and seaming methods, anchor trenches,
				patches, collars for all penetrations, installation in corners and leachate
				collection trenches. The plan of operation shall describe acceptable working
				conditions for geomembrane, GCL and geocomposite drain installation,
				installation instructions for working under weather variations and extremes,
				and criteria for halting or limiting GCL and geomembrane
				installation.
(g) Proposed methods
				for testing welds or other joining methods for geomembranes and other
				components or penetrations if geomembranes used in previously constructed
				phases are obtained from different manufacturers or are made from different
				resins. The plan of operation shall also include measures to preserve the edges
				of geomembranes and GCLs to be joined to future phases and describe measures to
				repair all geomembrane, GCL and geocomposite drain defects, unacceptable
				wrinkling, and unacceptable seams.
(h) Construction methods for placing the
				leachate collection system, sump backfill, and sideslope riser over the
				composite liner; the first 10 feet of wastes over the leachate collection
				system; and subsurface drain layer and rooting zone soils over the composite
				cap. The measures shall assure that the geomembrane and GCLs are not damaged by
				construction of soil layers, placement or compaction of wastes, waste
				consolidation or mass movements or puncturing of the geomembrane.
(i) A construction quality control plan that
				will be followed by all contractors preparing the surface of the compacted clay
				liner or soil barrier layer, constructing the geomembrane liner and placing
				drainage blanket. The construction quality control plan shall include means for
				determining and documenting: receipt of the proper geomembrane, GCL and
				geocomposite drain material; acceptable subgrade and weather conditions for
				work to occur; seamer qualifications and procedures for trial seams;
				acceptability of test welds and machine settings; acceptable seaming practices;
				achieved seam quality and procedures for dealing with failing tests; patching;
				and sealing of geomembrane penetrations. The construction quality control plan
				shall also describe how progress in construction, as well as any variations
				from the approved plans, will be recorded and reported.
(j) A construction quality assurance plan
				that will be followed by the registered professional engineer and qualified
				technician responsible for evaluating the construction and ensuring that the
				fabrication and installation meet design specifications. The construction
				quality assurance plan shall include continuous observation of all aspects of
				geomembrane, GCL and geocomposite drain installation activities by qualified
				engineers or technicians. The construction quality assurance plan shall include
				use of nondestructive and destructive testing of seams and samples and shall
				propose a schedule of tests and associated frequencies in accordance with those
				specified in ch. NR 516. The construction quality assurance plan shall include
				proposed methods of verifying the acceptability of the prepared subgrade,
				repairs, patches, penetrations, seams, and adaptations by the owner and
				contractors to unforeseen conditions.
(k) An outline of the contents of the
				anticipated preconstruction submittal which complies with the requirements of
				s. NR 516.04 (5) concerning geomembrane and GCL construction and which will be
				prepared and submitted prior to each construction event.
(l) A construction quality assurance plan for
				conducting a leak location survey on the installed geomembrane. The leak
				location survey shall be conducted after placement of the leachate collection
				layer for a composite liner. The quality assurance plan shall include
				continuous observation of all aspects of the leak location survey testing by
				qualified professional engineers or technicians. The quality assurance plan
				shall include use of nondestructive methods to detect, locate and verify
				repairs of defects in geomembrane. The quality assurance plan may include
				electrical resistivity testing or other testing methods acceptable to the
				department.