The Environmental Restoration Project at Sandia National Laboratories, New Mexico is tasked with assessment and remediation of the Mixed Waste Landfill in Technical Area 3. The Mixed Waste Landfill is an inactive radioactive and mixed waste disposal site. The landfill contains disposal pits and trenches of questionable location and dimension. Non-intrusive geophysical techniques were utilized to provide an effective means of determining the location and dimension of suspected waste disposal trenches before Resource Conservation and Recovery Act intrusive assessment activities were initiated. Geophysical instruments selected for this investigation included a Geonics EM-31 ground conductivity meter, the new Geonics EM-6 1 high precision, time-domain metal detector, and a Geometrics 856 total field magnetometer. The results of these non-intrusive geophysical techniques were evaluated to enhance the efficiency and cost-effectiveness of future waste-site investigations at Environmental Restoration Project sites.
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on the lower elevations (IT and Consensus Planning, Inc. 1992) (Figure 3-7). The landsurface percent slope in the SNL/KAFB area varies from less than 1 percent to greater than 46 percent (Figure 4-5). Most mountain ridges trend to the northwest-southeast; therefore, many of the steep slopes face either southeast or northwest (Figure 4-6). Vegetation characteristics and slope affect the surface runoff and potential infiltration rates. Steep slopes facing the southeast receive more sunshine for longer periods of time than those facing northwest, possibly causing different evapotranspiration rates to occur on southeast-versus northwest-facing slopes. Currently, surface runoff characteristics and evapotranspiration rates in the area are not well understood.
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