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<br />TABLE 4 <br />TDS Water Quality Standards <br />Background TDS Value (mq/11 Maximum Allowable TDS Concentrations <br />0 - 500 400 mg/1 or 1.25 times the background <br />level, whichever is least restrictive <br />501 - 10,000 1.25 times the background value <br />10,001 or greater No limit <br />a K Means less than. When the Membrane Filter Technique is <br />used for analysis, the average of all samples taken within a <br />year must be less than 1 organism per 100 milliters of <br />sample. When the Filter Tube Method is used for analysis, the <br />limit is less than 2.2 org/100 ml. <br />b If the identity and concentration of each radionuclide in a <br />mixture are known, the limiting value would be derived as <br />follows: Determine, for each radionuclide in the mixture, the <br />ratio between the quantity present in the mixture and the <br />limit specified. The sum of such ratios for all radionuclides <br />in the mixture shall not exceed "1" (i.e. unity). A <br />radionuclide may be considered as not present in a mixture if <br />the ratio of the concentration to the limit does not exceed <br />1/10 and the sum of such ratios for all radionuclides <br />considered as not present in the mixture does not exceed 1/4. <br />c ND Heans none detected using an approved analytical method <br />with the lowest detection limit for the parameter. <br />d Measured as dissolved concentration. The sample water shall <br />be filtered through a 0.45 micron membrane filter prior to <br />preservation. The total concentration (not filtered) may be <br />required on a case-by-case basis if deemed necessary to <br />characterize the pollution caused by the activity. <br />e If two or more radionuclides are present, the sum of their <br />annual dose equivalent to the total body or to any organ shall <br />not exceed 4 mrem per year. Except for Tritium and Strontium <br />90 the concentration of man-made radionuclides causing 4 mrem <br />total body or~organ dose equivalents shall be calculated on <br />the basis of a 2 liter per day drinking water intake using the <br />168-hour data listed in "Maximum Permissible Body Burden and <br />Maximum Permissible Concentration of Radionuclides in Air or <br />Water for Occupational Exposure," NBS Handbook 69, as amended, <br />August 1963, US Department of Commerce. <br />-lb- <br />