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Table 1 Container Type and Volume, Preservation Methods, and Analytical Methodology Container Type Preservation Analytical Parameter and Volume Method Method Calcium One 1 liter Pb Nitric Acid` 200.7 Magnesium One 1 liter P Nitric Acid 200.7 Potassium One 1 liter P Nitric Acid 200.7 Sodium One 1 liter P Nitric Acid 200.7 TDS Two 1 liter P Cool on ice 160.1 pH Two 1 liter P Cool on ice 150.1 Sulfate Two 1 liter P Cool on ice 375.2 Chloride Two 1 liter P Cool on ice 325.2 EC Two 1 liter P Cool on ice 120.1 NO,/NO, (as N) One 250 ml P Sulfuric Acid 353.2 'Methods given are the following: U.S. Environmental Protection Agency (EPA), 1983. Methods for Chemical Analysis of Water and Wastes. EPA Manual 00/4-79-020. bPlastic. `Acid preservatives are pH<2. Before sampling at each well, the water level will be measured to the nearest 0.01 foot using a calibrated electric sounder. Based on the water level and the depth of the well, the volume of water in the well will be calculated. One volume of water will be considered to consist of water stored within the casing plus that stored in the filter pack, assuming the filter pack has a porosity of 0.30. Each well will be bailed or pumped until a minimum of 3 volumes of water are withdrawn. This purging ensures that groundwater withdrawn directly from the aquifer is sampled,rather than water that has been residing in the well casing. Temperature, pH, and EC will be measured on a sample of water prior to purging, and after each volume of water has been withdrawn. pH will be measured with a field pH probe calibrated daily with standard buffer solutions. EC will be measured using a field conductivity bridge, zeroed and checked daily using deionized water. Water will continue to be withdrawn from the well until pH has stabilized to within 0.1 pH units, temperature to within 0.5° Centigrade, and EC to within 10 µmhos/cm conductivity, or until 10 volumes have been withdrawn. SAC/SAC36357/041.WP5 9 8/94