[dd, decimal degrees; ft, feet above the North American Vertical Datum of 1988; OB, bulk deposition from E or VWM; E, depth-integrated depth-integrated environmental; VWM, volume-weighted mean of two snowpack layers; ANC, acid neutralization capacity; ueq/L, microequivalents per liter; uS/cm, microsiemens per centimeter; SC, specific conductance at 25degC; pH values in standard units; H, hydrogen; Ca, calcium; Mg, magnesium; Na, sodium; K, potassium; NH4, ammonium; Cl, chloride; SO4, sulfate; NO3, nitrate; DOC, dissolved organic carbon; mg/L, milligrams per liter; SWE, snow-water equivalent; cm, centimeters; d34S, stable-sulfur isotope ratio (34S/32S); Hg, mercury; ng/L, nanograms per liter; NA or empty cell indicates not analyzed; <, below reporting limits; M, presence verified but not quantified; %, percent missing year indicates no sample collected or sample results reviewed and rejected Roth 1994: Mercury in water by CVAFD with potassium dichromate preservation USEPA Method 1631, Rev E: Mercury in water by Oxidation, Purge and Trap, and CVAFS] Station ID 445548111032200 Site Name TWENTY-ONE MILE, MT Latitude (dd) 44.93 Longitude (dd) -111.0561111 Elevation (ft) 7246 SiteNumber StationName SampleDate WaterYear SampleType ANC (ueq/L) SC (uS/cm) pH H (ueq/L) Ca (ueq/L) Mg (ueq/L) Na (ueq/L) K (ueq/L) NH4 (ueq/L) Cl (ueq/L) SO4 (ueq/L) NO3 (ueq/L) DOC (mg/L) Total N (mg/L) Total Dissolved N (mg/L) Hg (ng/L) Roth 1994 Hg (ng/L) USEPA 1631 d34S (per mil) SWE (cm) Snow Depth (cm) Ionic Balance (%) 445548111032200 TWENTY-ONE MILE, MT 1993-03-29 1993 OB -16 6 4.9 12.6 <3.1 <1.7 <3 0.8 5 1.7 6.9 7.3 0.4 4.3 38 102 7.3 445548111032200 TWENTY-ONE MILE, MT 1994-03-18 1994 OB -6 4 5.2 6.3 <3.1 <1.7 <3 0.5 8.2 3.7 5.6 7.1 0.7 6 89 -4.5 445548111032200 TWENTY-ONE MILE, MT 1995-03-13 1995 OB -7 4 5.1 7.9 <3.1 <1.7 <3 <0.5 5.2 1.4 5 7.3 0.7 4.4 155 -2.2 445548111032200 TWENTY-ONE MILE, MT 1996-03-12 1996 OB 0 3 5.5 3.2 4.6 <1.7 1.3 1.5 4.5 1.7 3.5 5.9 1 6.2 142 15.3 445548111032200 TWENTY-ONE MILE, MT 1997-03-10 1997 OB -6 3 5.3 5 <3.1 <1.7 <0.5 3 1.1 2.7 5.4 0.6 4.6 213 -7 445548111032200 TWENTY-ONE MILE, MT 1998-03-07 1998 OB -11 5 5.1 7.9 <3.1 <1.7 <0.5 7 2.3 5.4 9.7 0.5 4.8 130 -7.7 445548111032200 TWENTY-ONE MILE, MT 1999-03-07 1999 OB -6.6 6 5.2 6.3 3.5 <1.7 4.8 2.3 10 2 5.2 8.3 0.7 168 26.9 445548111032200 TWENTY-ONE MILE, MT 2000-03-05 2000 OB -3.2 4 5.2 6.3 <3.1 <1.7 <0.9 <0.5 7.5 <1.1 4.6 8.6 122 2.2 445548111032200 TWENTY-ONE MILE, MT 2001-03-05 2001 OB -6.2 4 5.2 6.3 3.5 <1.7 1.3 <0.5 8.2 <1.1 4.4 12.1 0.4 109 7.8 445548111032200 TWENTY-ONE MILE, MT 2002-03-04 2002 OB -5.6 4 5.3 5 <3.1 <1.7 <0.9 0.5 6.9 1.1 3.1 7.9 0.4 2.6 30 109 1.2 445548111032200 TWENTY-ONE MILE, MT 2003-03-03 2003 OB 0.2 4 5.6 2.5 7 <1.7 2.2 0.8 8.9 1.7 5.4 9.3 0.6 2.4 24 94 13.7 445548111032200 TWENTY-ONE MILE, MT 2004-03-01 2004 OB -12.2 7 5.1 7.9 6 <1.7 1.3 2.8 5.5 1.4 4.4 7.1 1.3 1.4 36 135 29.1 445548111032200 TWENTY-ONE MILE, MT 2005-02-28 2005 OB -4.8 5 5.3 5 <3.1 <1.7 <0.9 1 6.7 1.1 3.1 6.4 0.5 3.7 23 84 9 445548111032200 TWENTY-ONE MILE, MT 2006-02-27 2006 OB -1.2 3.5 5.5 3.2 1 <0.2 <0.9 1 8 1.4 2.9 6.4 0.81 35 127 10.5 445548111032200 TWENTY-ONE MILE, MT 2007-02-22 2007 OB 7.4 4.9 6 1 6 0.8 2.2 0.5 8.8 2.3 4.2 7.9 0.44 31 114 29.9 445548111032200 TWENTY-ONE MILE, MT 2008-02-21 2008 OB -3.2 5.3 5.3 5 4.5 0.8 1.3 <0.5 6.8 1.4 1.7 5.7 0.45 43 140 35.3 445548111032200 TWENTY-ONE MILE, MT 2009-02-19 2009 OB -0.4 3.6 5.6 2.5 3 0.8 1.7 1 7.6 2.3 2.7 7.1 1 4.92 24 84 15.7 445548111032200 TWENTY-ONE MILE, MT 2010-02-25 2010 OB -9.4 6.4 5 10 3 0.8 2.2 <0.5 6.4 2.5 3.5 10.7 <0.2 0.91 19 69 14.6 445548111032200 TWENTY-ONE MILE, MT 2011-02-24 2011 OB -1 3.6 5.5 3.2 5 0.8 4.3 0.8 5.9 3.1 3.5 5.7 1.79 4.11 37 137 23.8 445548111032200 TWENTY-ONE MILE, MT 2012-02-23 2012 OB 14 5 5.4 4 14.5 2.5 8.3 1.5 8.9 5.4 5.2 6.2 0.9 0.27 5.62 29 94 52.3 445548111032200 TWENTY-ONE MILE, MT 2013-02-21 2013 OB -8 4 5.2 6.3 6 2.5 1.3 1.8 9.3 2.8 3.1 7.1 0.6 0.23 5.9 28 99 35.3