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Table 1 <br /> Container Type and Volume, Preservation Methods, <br /> and Analytical Methodology <br /> Container Type Preservation Analytical <br /> Parameter and Volume Method Method' <br /> Calcium One 1 liter P' Nitric Acid` 200.7 <br /> Magnesium One 1 liter P Nitric Acid 200.7 <br /> -- Potassium One 1 liter P Nitric Acid 200.7 <br /> Sodium One 1 liter P Nitric Acid 200.7 <br /> TDS Two 1 liter P Cool on ice 160. 1 <br /> f <br /> pH Two 1 liter P Cool on ice 150. 1 <br /> c <br /> Sulfate Two 1 liter P Cool on ice 375 .2 € <br /> S <br /> Chloride Two 1 liter P Cool on ice 325 .2 <br /> EC Two 1 liter P Cool on ice 120. 1 <br /> NO,/NO, (as N) One 250 ml P Sulfuric Acid 353.2 <br /> 'Methods given are the following: U.S. Environmental Protection Agency (EPA), <br /> ` { 1983 . Methods for Chemical Analysis of Water and Wastes. EPA Manual 00/4-79-020. <br /> 'Plastic. <br /> `Acid preservatives are pH < 2. <br /> I _ E <br /> E_ <br /> Before sampling at each well, the water level will be measured to the nearest 0.01 foot using <br /> a calibrated electric sounder. Based on the water level and the depth of the well, the j <br /> -'' volume of water in the well will be calculated. One volume of water will be considered to <br /> consist of water stored within the casing plus that stored in the filter pack, assuming the filter <br /> pack has a porosity of 0.30. <br /> s <br /> Each well will be bailed or pumped until a minimum of 3 volumes of water are withdrawn. <br /> This purging ensures that groundwater withdrawn directly from the aquifer is sampled, rather <br /> than water that has been residing in the well casing. Temperature, pH, and EC will be <br /> measured on a sample of water prior to purging, and after each volume of water has been <br /> withdrawn. pH will be measured with a field pH probe calibrated daily with standard buffer <br /> solutions. EC will be measured using a field conductivity bridge, zeroed and checked daily <br /> using deionized water. Water will continue to be withdrawn from the well until pH has <br /> stabilized to within 0. 1 pH units, temperature to within 0.5° Centigrade, and EC to within <br /> 10 µmhos/cm conductivity, or until 10 volumes have been withdrawn. <br /> _ SAC/SAC36357/041.wP5 9 8/94 <br />