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<br />Tabls 6. a'5N compositions of dissolved nitrate In surface water and ground water, and a'5N compositions of solid and <br />dissolved ammonium In surface watsr and ground water <br /> <br />[NO). nitrate;~. ammonium; NA. not applicable: in., inch] <br /> 8'8N-NO., 8'8N-NH., <br />Sample Dete dissolved dissolved <br />name (permU) oraoUd <br /> (permU) <br />Metro soulb outfall 11111/92 NA 9.2 <br />Metro north outfall 11111/92 7.6 NA <br />Soulb Platte River at McKay Road 11102192 NA 14.2 <br />McKay Road-piezometer I 11102192 NA 7,6 <br />McKay Road-piezometer 2 11102/92 NA 16.6 <br />McKay Road-piezometer 3 11102192 NA 20.2 <br />McKay Road-well2A 11102192 NA 17.2 <br />McKay Road-well 2B 11102/92 NA 13.0 <br />South Platte River at Road 8 11130/92 9.1 NA <br />Road 8-piezometer I 11130192 9.0 NA <br />Road 8-piezometer 2 11130/92 8.4 NA <br />Road 8-welllA 11130/92 8,4 NA <br />Road 8-welllB 11/30/92 8.4 NA <br />Cross-section site 6 ground water (12 in. below 12/22/92 NA 11.3 <br />sediment/water interface) <br />Cross-section site 6 waterfowl waste (fresh) 12/22/92 NA 11.3 <br />Cross-section site 6 waterfowl waste (weathered) 12122/92 NA 15.7 <br /> <br />Tsble 7. Rates of nitrous oxide production measured In laboratory Incubations of riverbed and aqulfsr sediments <br /> <br />[N20, nitrous oxide; N03. nitrate; mmollL, millimoles per liter; nmoVgdw/d, nanomoles per gram of dry sediment per day;:t. plus or minus] <br /> <br /> Rate of N.O production at given NO. concentration <br /> (nmoVgdw/d) <br /> Measured Addition of Measured 1 mmoVL 10 mmoVL <br />Sample concentration of 1 mmoVL nUrate dissolved dissolved <br />name dissolved nitrate gIUC088 concentration nitrate nitrate <br /> (mmoVL) <br />881b Avenue riverbed sedimenl 0.003 No 0:1:0 52:1:6 400:1: 29 <br />881b Avenue riverbed sediment ,003 Yes 0:1:0 124:1:35 1,483 :I: 232 <br />McKay Road riverbed sediment ,021 No 0:1:0 84:1: 15 214:1: 13 <br />McKay Road riverbed sediment .021 Yes 0:1:0 336 :I: 43 1,384 :I: 24 <br />Henderson riverbed sediment ,021 No 1:1:0 19 :1:8 122:1: 14 <br />Henderson riverbed sediment .021 Yes 0:1:0 200 :I: 22 1,034 :I: 237 <br />Road 8 riverbed sediment .357 No 15 :1:5 25:1:5 28:1:7 <br />Road 8 riverbed sediment ,357 Yes 25:1:6 271:1:41 321 :1:28 <br />Henderson aquifer sediment .214 No 3:1:1 2 :1:0 7:1:0 <br />Henderson aquifer sediment .214 Yes 34:1: 6 22:1:9 25:1:4 <br /> <br />34 Quantity end Quellty of Ground-Weter Discharge to the South Plalle River, Denver to Fort Lupton, Colorado, <br />August 1992 Through July 1993 <br /> <br />~ <br />