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Landfill Performance Assessment at a Semiarid Site: Modeling and Validation
Authors:Daniel B Stephens  Larry M Coons
Institution:Dr. Daniel B. Stephens (6020 Academy Rd., NE, Ste. 100, Albuquerque, NM 87109), formerly chairman of the Geoscience Department at New Mexico Institute of Mining and Technology (NMIMT) in Socorro, New Mexico, began private consulting in 1976 and founded Daniel B. Stephens &Associates Inc. (DBS&A) in 1984. Stephens is the principal hydrologist and president of DBS&A, an adjunct professor of geology at the University of New Mexico in Albuquerque, and an adjunct professor of hydrology at NMIMT. He received his bachelor's degree in geological science from Penn State University, his master's degree in hydrology from Stanford University, and his doctorate in hydrology from the University of Arizona. Stephens, a certified Professional Hydrogeologist, has nearly 20 years experience in a variety of hydrogeologic problems ranging from site characterization to mathematical modeling of flow and transport.;Larry M. Coons is presently systems operations manager and senior engineer at Daniel B. Stephens &Associates Inc. (6020 Academy Rd, NE, Ste. 100, Albuquerque, NM 87109). Coons began private consulting in New Mexico in 1981 after receiving his bachelor's degree in geological engineering and master's degree in civil engineering from New Mexico State University. Coons is a registered Professional Engineer in New Mexico, Utah, Colorado, and Arizona and is a certified Professional Hydrogeologist. Coons has broad experience in hydrogeology and hydrological engineering, but specializes in design and performance assessment of waste repositories for municipal waste, radioactive waste, and mining and milling waste.
Abstract:The HELP model (Version 2.05) was applied to simulate the long-term percolation from a proposed landfill in southern New Mexico. The model predicted percolation would be about 0.0012 in/yr (10-10 cm/s). This result compared very favorably with independent estimates of recharge at the site which used the chloride mass balance method and hydrogeologic properties. The recharge estimates at this site are also quite similar to values obtained at other sites in New Mexico and west Texas. The long-term percolation through a closed landfill at this site is very small and would be nearly 1000-fold smaller than the saturated hydraulic conductivity of a typical clay liner.
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