This article originally appeared in  Arctic, Antarctic, and Alpine Research, vol. 42, no. 1, February 2010. On p. 102, change wording in the caption for Table 1 from “Constituent concentrations (μeq L⁻¹, excepted where noted)” to “Constituent concentrations (EC: μS cm⁻¹; pH: unitless; ANC: μeq L⁻¹; cations and anions: mg L⁻¹).”