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File No. 20-3978-01.WR9 KLEINFELDER <br /> December 9, 1996 <br /> electromagnetic and magnetic fields measured by each instrument). These maps will then be <br /> used to guide the more expensive field trenching activities. <br /> 2.2 Landfill Trenching <br /> Landfill trenching will consist of two separate activities dependent upon the results of the <br /> geophysical survey. These activities are discussed in the following subsections. <br /> 2.2.1 Geophysically Confirmed Areas <br /> In those areas where the geophysical survey indicated the presence of waste, a backhoe will be <br /> used to trench the landfill. The purpose of backhoe trenching is threefold: <br /> 1. Establish horizontal extent of waste (footprint of the fill area) <br /> 2. Establish the depth of waste <br /> 3. Expose waste for visual characterization <br /> The backhoe excavation will be done with one backhoe, an operator, and a Kleinfelder <br /> professional. The location of the trenching (and lateral extent of waste) will be established using <br /> a GPS unit. The contents of the waste will be recorded. This visual assessment will include <br /> documentation(via written notes and photographs) of: <br /> • thickness and character of existing soil cover <br /> • types of waste <br /> • moisture content of waste and underlying soils (dry, moist, wet) <br /> • presence of standing leachate <br /> • staining of underlying soils or intermediate soil layers <br /> In addition, field screening measurements will be taken for volatile organics (photo or flame <br /> ionization detector) and combustible gas (methane monitor). <br /> A backhoe with an extending arm (also known as an Extendahoe) will be used. This equipment <br /> can excavate to a depth of 15 feet. If waste is encountered at deeper depths, then an excavator <br /> will have to be brought onsite at additional cost. <br /> 10-3978-01.WR91MP960143 Page 3 of 01996, Kleinfelder, Inc, <br />