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Anion-Cation Charge Balance <br /> Anion-cation charge balance is calculated using concentrations of the major <br /> anions and cations in milliequivalents per liter (meq/L). The difference between <br /> the two sums is calculated as a percentage: <br /> Anions -Cations X 100 <br /> Anions + Cations <br /> We use +/- 5 percent as a guide for an acceptable percent difference. The <br /> cation/anion balance difference exceeded 5 percent in one of nine samples (11 <br /> percent). The results are summarized in the following table. <br /> Sum Cations Sum Anions An/Cat Balance <br /> Site Date (meq/L) (meq/L) (percent <br /> difference <br /> KMW-1 5/3/2010 42.56 41.61 1.1% <br /> KMW-2 5/3/2010 35.50 34.08 2.0% <br /> KMW-3 5/3/2010 54.85 56.35 -1.4% <br /> KMW-4 5/3/2010 41.93 41.31 0.7% <br /> KMW-6 5/3/2010 10.12 11.74 -7.4% <br /> KMW-7 5/3/2010 41.16 38.02 4.0% <br /> W-1 5/3/2010 41.32 39.42 2.4% <br /> W-2 5/3/2010 22.90 21.39 3.4% <br /> MW-5 5/3/2010 50.73 47.96 2.8% <br /> Percent differences in bold are outside the recommended limit. <br /> - E-3 - <br />