Peter B. McMahon

• A reconnaissance study of the effect of irrigated agriculture on water quality in the Ogallala Formation, Central High Plains Aquifer
• In-situ bioremediation of nitrate-contaminated ground water
• Use of diverse geochemical data sets to determine sources and sinks of nitrate and methane in groundwater, Garfield County, Colorado, 2009
• Vertical gradients in water chemistry and age in the northern High Plains Aquifer, Nebraska, 2003
• Vertical gradients in water chemistry and age in the southern High Plains aquifer, Texas, 2002
• Vertical gradients in water chemistry in the central High Plains aquifer, southwestern Kansas and Oklahoma panhandle, 1999
• Water movement through thick unsaturated zones overlying the central High Plains aquifer, southwestern Kansas, 2000-2001
• Water movement through thick unsaturated zones overlying the central High Plains aquifer, southwestern Kansas, 2000-2001
• Water-quality assessment of the High Plains aquifer, 1999-2004