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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148 2 <br /> LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND <br /> THE U.S. DEPARTMENT OF ENERGY FOR <br /> LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 <br /> SAN JOAQUIN AND ALAMEDA COUNTIES <br /> ATTACHMENT 21 - CONTINUED <br /> Evaluation of cooling tower discharges on ground water quality using the designated level <br /> methodology (DLM); comparison of maximum value detected in samples with the DLM values for <br /> septic sstems less than 30 feet above ground water using attenuation factor of 10. <br /> Designated <br /> level <br /> Maximum methodology Corresponding Source of water <br /> Parameter Units value detected value water quality quality goala <br /> in effluent (10 attenuation goal <br /> factor <br /> Ortho-phosphate m /L 0.52 None None None <br /> Potassium m /L 13 None None None <br /> Sodium mg/L 390 Not applicable 30-60 Taste & odor <br /> threshold <br /> Specific conductance pmmos/c 1,760 Not applicable 900 CA secondary MCL <br /> Sulfate m /L 305 Notapplicable 250 CA secondary MCL <br /> Total alkalinity as CaCO3 m /L 410 None None None <br /> Total dissolved solids m /L 1,220 Not applicable 500 CA secondary MCL <br /> Total hardness as CaCO m /L 58 None None None <br /> Total phosphorus as P m /L 0.72 None None None <br /> Total trihalomethanes m /L 0.011 Not applicable 0.08 CA primary MCL <br /> Vanadium m /L 0.037 0.5 0.05 IRIS <br /> Zinc I m /L 0.051 50 5 1 CA secondary MCL <br /> a From A Compilation of Water Quality Goals (Marshack August 2007). <br /> b IRIS — USEPA Integrated Risk Information System reference dose for drinking water. <br /> C MCL — Maximum contaminant level. <br />