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• Constituents reportedly detected in monitoring well water samples at levels <br /> ' that exceed State and/or Federal EPA MCL's. <br /> • Constituents commonly found in wastewater. <br /> Most constituents listed in Table 2 occur naturally in the environment. Because <br /> well water may represent a mixture of pre-project groundwater and reclaimed <br /> water, it can be advantageous to distinguish between natural changes in <br /> constituent concentrations from those directly attributed to land disposal of <br /> treated wastewater. A partial list of possible indicator parameters includes: <br /> • Chloride, bromide, fluorides,lo <br /> • Caffeine". <br /> ' • Ethylenediaminetetraacetic acid (EDTA)12. <br /> • Stable isotopes of oxygen and hydrogen13. <br /> • Boron isotopes 14. <br /> ' Reliable indicator parameters can be identified by conducting a reconnaissance <br /> of pre-project groundwater, San Joaquin River water (the historical irrigation <br /> water source), municipal supply water, and reclaimed water. The most <br /> successful indicators can then be included as part of the monitoring program to <br /> identify water samples influenced by reclaimed water. <br /> 1 <br /> 1 <br /> s Stanley N. Davis, Donald O. Whittemore, and June Fabryka-Martin, "Uses of Chloride/Bromide <br /> ' Ratios in Studies of Potable Water", Journal of Ground Water, 1998, pp. 338-350. <br /> 10 Avner Vengosh and Irena Pankratov, "Chloride/Bromide and Chloride/Fluoride Ratios of <br /> Domestic Sewage Effluents and Associated Contaminated Ground Water", Journal of Ground <br /> Water, 1998, pp. 815-824. <br /> ' " Ralph L. Seiler, Steven D. Zaugg, James M. Thomas, and Darcy L. Howcroft, "Caffeine and <br /> Pharmaceuticals as Indicators of Waste Water Contamination in Wells", Journal of Ground Water, <br /> 1999, pp. 405-410. <br /> ' 12 Barber, Larry, II.And others, "Organic Constituents that Persist During Aquifer Storage and <br /> Recovery of Reclaimed Water in Los Angeles County, California", in Conjuctive Use of Water <br /> Resources, Aquifer Storage and Recovery, AWRA Symposium Proceedings, 1997. <br /> 13 R. Aravena, M.L. Evans, and J.A. Cherry, "Stable Isotopes of Oxygen and Nitrogen in Source <br /> Identification of Nitrate from Septic Systems', Journal of Ground Water, 1993, pp. 180-86. <br /> 14 A. Vengosh, K.G. Neumann, S. Juraske, and R. Kasher, "Boron Isotope Application for Tracing <br /> Sources of Contamination in Groundwater", Environmental Science and Technology, 1994, pp. <br /> 1968-74. <br /> ' 13 - <br />