Percent Organic Carbon Remaining Group/Treatment (%) Day 0 Day 14 Day 28 Control (C) 7.42 ± 0.07 7.01 ± 0.24 7.14 ± 0.06 C + E5 7.42 ± 0.07 4.01 ± 0.08 3.65 ± 0.25 C + E10 7.42 ± 0.07 3.86 ± 0.15 3.59 ± 0.07 C + E20 7.42 ± 0.07 3.71 ± 0.08 3.32 ± 0.07 C + A 7.42 ± 0.07 3.75 ± 0.09 3.65 ± 0.06 C + A + E5 7.42 ± 0.07 3.37 ± 0.07 3.24 ± 0.07 C + A + E10 7.42 ± 0.07 3.62 ± 0.08 3.24 ± 0.05 C + A + E20 7.42 ± 0.07 3.48 ± 0.06 3.16 ± 0.07

Key: C = Contaminated soil (control) C + E5 = Contaminated soil incubated with 5 earthworms C + E10 = Contaminated soil incubated with 10 earthworms C + E20 = Contaminated soil incubated with 20 earthworms C + A = Contaminated soil + brewery mash C + A + E5 = Contaminated soil + brewery mash + 5 earthworms C + A + E10 = Contaminated soil+ brewery mash + 10 earthworms C + A + E20 = Contaminated soil + brewery mash + 20 earthworms

Table 6: Changes in soil percent organic carbon at days 0, 14 and 28.