2011 Issue

25 ranged 15 to 30 micrograms per liter [parts per billion], seven to 15 micrograms per liter today. Nitrate concentrations originally ranged 30 to 70 milligrams per liter, to less than ten milligrams per liter. Reduction in nitrate concentration occurred via natural attenuation and dilution. Explosive constituent concentrations may take decades to achieve cleanup criteria of twomicrograms per liter for RDX based on the current the US Environmental Protection Agency’s health advisory in the regional aquifer. Mr. Eagan is a professional geologist, and has a Master’s degree in Geology from Utah State University. He has worked with US Air Force, various mining and oil companies and the Utah Division of Water Quality over a period of 30 years. Mr. Bhayani, is an alumnus of Universities of Bombay, Mumbai, India, and Rhode Island, Kingston, RI, Diplomate of the American Academy of Environmental Engineers, and a registered professional engineer. He is affiliated with the Utah Division of Water Quality. The authors gratefully acknowledge the use of Figures 1, 2 and 3 prepared by Charter Oak Environmental Services, Inc. Figure 4. Division of Water Quality Evaluation Eagan Bhayani