Site

Distance from wastewater discharge (river km)

Gaseous N₂:Ar

N₂aec-N in bubbles (%)

South Platte

−18

79.93

−3.67 (0)

Site A

+5

95.28

10.6

+10

97.07

12.3

+16

97.51

12.7

Site B

+24

98.86

13.9

Site C

+44

88.62

4.42

Site D

+52

87.64

3.51

+81

87.55

3.42

Median

7.51 (7.51)