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<br />11. Concentrations of dissolved phosphorus in water from wells at McKay Road, Henderson, and
<br />Road 8 ..........................................................................................................,.........................,..................., 25
<br />12. Values of pH in (A) ground water 1 foot below the sediment/waler interface with time, and
<br />(B) surface water and ground water 1 foot below the sediment/water interface with distance
<br />downstream from the Metro Wastewater Reclamation District effluent outfalls ....................................... 26
<br />13. Values of pH in ground waler with depth below the sediment/water interface at McKay Road,
<br />
<br />Henderson, and Road 8..,......................................................................,...................,................................. 27
<br />14. Concentrations of dissolved oxygen in ground water 1 foot below the sediment/water interface
<br />with (A) dislance downstream from the Metro Waslewater Reclamation District effluent outfalls,
<br />
<br />and (B) time ............,.........................,......................................................,.................................................. 28
<br />15, Concentrations of dissolved oxygen and differences in hydraulic head between ground water
<br />and surface water with depth below the sediment/water interface ......................................,.................,.... 29
<br />16. Concentrations of t01a1 organic carbon in ground water with depth below the sediment/water
<br />imerface at McKay Road, Henderson, and Road 8 ,..............................................................................,.... 30
<br />17. Concentrations of (A) dissolved nitrite plus nilrale, and (B) dissolved ammonium in ground
<br />water 1 foot below the sediment/waler interface with dislance downstream from the Metro
<br />Waslewater Reclamation Dislrict effluent outfalls ................................................,....,............................... 31
<br />18, Concentrations of (A) dissolved nitrite plus nitrate and ammonium and the 1i1sN composition
<br />of dissolved ammonium, and (B) concentrations of dissolved phosphorus in ground water with
<br />depth below the sediment/water interface at McKay Road on November 2, 1992....,............................... 33
<br />
<br />TABLES
<br />
<br />1. Surface-water sites at which discharge was measured.............................................................................................. 5
<br />2, Location of cross-section sites at which ground-water discharge was measured '.................................................... 6
<br />3. Construction delails for monitoring wells at the McKay Road, Henderson, and Road 8 sites.............................,... 9
<br />4. Water balance for selected reaches of the South Platte River on selected dates..............,........................................ 12
<br />5. Percent of grain sizes less than 0.079 inch and percent organic matter in O,079-inch size fraction for
<br />riverbed and aquifer sedimenls at McKay Road, Henderson, and Road 8 ....,......................................................,... 21
<br />6. IitSN compositions of dissolved nitrale in surface water and ground water, and 1i1SN compositions of
<br />solid and dissolved ammonium in surface water and ground water .............................,........................................... 34
<br />7. Rates of nitrous oxide production measured in laboratory incubations of riverbed and aquifer sediments ............. 34
<br />8. Discharge at selected surface-water sites on selected dates........................,..,..............,..........................,.........,...... 40
<br />9. Rates of ground-water discharge across the sediment/water interface and quality of surface water and
<br />ground water 1 foot below the sediment/water interface at cross-section sites ....,.............................................,..... 43
<br />10. Water-quality dala for water from the South Platte Riv~r, piezometers, and wells at McKay Road,
<br />Henderson, and Road 8 .........................,............................,...................................................................................... 52
<br />11. Quality-assurancelquality-control data for major-ion, nutrient, iron, and manganese analyses.............................., 68
<br />
<br />IV CONTENTS
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