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Dissolved oxygen concentration (DO) and dissolved organic carbon (DOC) within receiving surface waters. Normal DO of seepage headwaters in the vicinity range from 2.3 to 2.9 mg L−1, while unimpacted groundwater DOC was 1.78 ± 0.29 mg L−1 during this period..

 
Receiving stream headwaters
Days since installation DOC DO
mg L−1
14 4.8 2.4
22 5.3
29 4.9 1.2
36 3.6 1.6
50 2.3 2.6
499 2.9
660 0.94 2.8