“…(2010) successfully relates shifts in microbial community structure to varying levels of leachate from a landfill in ex situ laboratory microcosms, suggesting that this technique could be used as an effective in situ tool for detecting low levels of contamination at their study area. More recent and robust examples include monitoring the effectiveness of an acetate injection into an RDX (1,3,5‐trinitro‐1,3,5‐triazine) chemical compound plume by tracking temporal changes in microbial activity (Livermore, Jin, Arnseth, LePuil, & Mattes, 2013) and statistically comparing relationships between bacteria communities, geology, depth, and groundwater quality along a generalized flow path (Guo, Wang, Sheng, Shi, & Sun, 2019; Meng et al., 2020).…”