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<br />CONTENTS
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<br />Abstract.... .............,..................... ,......... ,.... ..,..........., ............. ............. .........,.... ..,............ ....... ,.,... ..............,.. ........................ I
<br />Introduction ,. ..,.....,..........., ......,.. ..., .......... ..,......... ..'....,..,.................... ..... ............ ............ ...... ..,.... ,..,...... ............ ........... ......, 1
<br />Site Description ...,..,...............,......, ............. ................................... ........................ ................... .........,. ...... ..,....,.. ....... I
<br />Methods ,.....,..,...... ..,......... .... .........'.... ,. .............,.............. ......... ..... ......, ,....... .....,..' .....,.................................. ,..,..,...... 1
<br />Results of Precipitation Volumes and Chemical Concentrations ......,..,......,....,..............,....,..........,..................,.......,.......... 3
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<br />References Cited... ...,..,.., ......,.. ,..,.., ......,........ .....,..........,.. ........ ................,...... ....,.. ..,............... ....,. ....,........ ..'..,.., ....,...........' 8
<br />Precipitation Data........... ......... ....... .................. ..,....,... ..................... ..................... ...,.. ,.... ,....... .....,............ ...... ....,............. I ~3
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<br />FIGURES
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<br />1. Map showing location of selected precipitation-monitoring sites in northwestern Colorado............................,............., 2
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<br />2--10. Box plots showing:
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<br />2, Seasonal variability of hydrogen-ion concentration ....,..............,..,.....,................,...................,..................,.............. 3
<br />3. Seasonai variability of c81cium..,......,..,........,.........................,......,...........,..........,.............,.........,.....,....,.................. 4
<br />4, Seasonal variability of magnesium,.....,........,.............,............,.....,................................. ..........................,..............., 4
<br />5, Seasonal variability of sodium.......,. .................. .,....... ................... ...,.................... ,....... .....,.............................. ........, 5
<br />6, Seasonal variability of potassium ,.,..,...........,......,.....................................,.......,.."......,....,......................................., 5
<br />7, Seasonal variability of ammonium ......,.........,..,............................,.......................,.........,.....,..,................................, 6
<br />8, Seasonal variability of chloride ,.............,...,..,..............................,............,......,....................................,.................,.. 6
<br />9. Seasonal variability of nitrate ........,..................,.....,.,..,..,..............,..................,.......................,..'......,..,......,............. 7
<br />10. Seasonal variability of sulfate..,..,......... ,.........., ,....., ....,..,............ ......... ...., .......,.... ......, ..... ....,........,...................,......' 7
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<br />TABLES
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<br />1. Precipitation volume, specific conductance, concentrations of dissolved ions, and percent charge balance
<br />for each sampling interval at Douglas Pass, 1980--91..........................,..,............,.....,....,..........,................................ 10
<br />2, Summary statistics of specific conductance and concentrations of dissolved ions at Douglas Pass, 1980--91........... 17
<br />3. Precipitation volume, specific conductance, concentrations of dissolved ions, and percent charge balance
<br />for each sampling interval at Grand Mesa, 1981-91....................,....,..,........................,..,............,...................,......... 17
<br />4. Summary statistics of specific conductance and concentrations of dissolved ions at Grand Mesa, 1981-91............. 25
<br />5. Precipitation volume, specific conductance, concentrations of dissolved ions, and percent charge balance
<br />for each sampling interval at Marvine Ranch, 1981-94......,.......,........................................,......................,............... 25
<br />6. Summary statistics of specific conductance and concentrations ofdis.olved ions at Marvine Ranch, 1981-94....... 46
<br />7. Daily precipitation volume for Douglas Pass, 1980--91....,....,..,..,........................................,...,....,...................,........ 47
<br />8. Daily precipitation volume for Grand Mesa, 1981-91..........,............,..............,......,........................,.................,....... 59
<br />9. Daily precipitation volume for Marvine Ranch, 1981-94,....,......,...........,........,..,....,......................................,..,....,.. 70
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<br />CONTENTS III
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