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National Primary Drinking Water Standard of 5 ug/L. The increasing trend for tetrachloroethene <br />at AMW-19 is not observed when the data are limited to the period of November 2004 to May <br />2011, indicating that concentrations have stabilized in the past seven years. <br />The second quarter 2011 concentration of trichloroethene at AMW-19 (1 ug/L) is within the <br />range of concentrations observed at that well since February 2004 (0.18 to 2.1 ug/L), and is below <br />the National Primary Drinking Water Standard of 5 ug/L. The increasing trend for <br />trichloroethene at AMW-19 is not observed when the data are limited to the period of November <br />2004 to May 2011, indicating that concentrations have stabilized in the past seven years. <br />11 <br />