Bacterial Genus Agricultural Residential Brownfield Acinetobacter 4.32x1016 3.12x1016 1.31x1017 Alcaligenes 7.29x1019 2.37x1020 2.26x1018 Arthrobacter 4.135x1010 1.636x1013 1.396x1012 Bacillus 4.06x1014 5.12x1014 3.36x1014 Flavobacterium 1.8x1016 4.53x1010 4.21x1011 Pseudomonas 1.624x1014 1.682x1014 2.56x1015

Table 1: qPCR-based determination of genome copies per gram of soil from each bacterial genus in this study. Values are the mean value from triplicate samples analyzed using SYBR Green-based standard curves as described in Materials and Methods.