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CO-0000906 <br />New Elk Mine Water Quality Assessment <br />• Na+ <br />SAR = <br />g++ <br />Ca++ +M <br />2 <br />+ calcium (Ca-) and magnesium NO in this equation are expressed in <br />The values for sodium (Na ), <br />sodium, units of milliequivalents per liter (meq/1). Generally, data for <br />calculate the S1AR Thec on gersions aree <br />reported in terms of mg/1, which must then be converted <br />Concentration in mg / l <br />meq/1= <br />Equivalent weight in mg l meq <br />Where the equivalent weights are determined based on the atomic weight of the element divided by <br />the ion's charge: <br />Na+ = 23.0 mg/meq (atomic weight of 23, charge of 1) <br />Ca++ = 20.0 mg/meq (atomic weight of 40.078, charge of 2) <br />Mg++ = 12.15 mg/meq (atomic weight of 24.3, charge of 2) <br />0 <br />C7 <br />Page 20 of 29 Last Revised August 26, 2008 <br />Appendix A (WQA version 5-4(FABL))