Supplemental text, varying stages of river water intrusion at the Hanford Area 300 site (Fig. S1), diagrammatic representation of river stage driven hydrological dynamics within the Hanford 300 Area SIZ (Fig. S2), conceptual explanation of the cross feeding and desorption/cross feeding experiments (Fig. S3), photos of near-shore riverbed environment (Fig. S4), specific conductivity (Fig. S5), ATP content and rates of resazurin transformation to resorufin (Fig. S6), SEM images of diatom frustules in RBS material (Fig. S7), relative abundances of different taxa (Fig. S8 and S9 and Tables S4 to S6), photos of GWS, RBS, and PZS reactors at the start of CF1 (Fig. S10), conceptual illustration of a key biogeochemical implication of this study (Fig. S11), pairwise comparisons (Table S1 and S2), and Shannon and Simpson diversity indices (Table S3).
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