The untreated soil contained lead totals ranging from 2,000 mg/kg to 40,000 mg/kg in characterization testing. Composite sample 3 resulted in 4,100 mg/kg arsenic, leaching at 10.2 mg/L in TCLP prior to treatment. A dosage rate of 1% wt./wt. EnviroBlend HX reduced arsenic leachability to 0.40 mg/L. SPLP testing was conducted for leaving some materials on-site, with a target of 1.0 mg/L or less and coupled with acceptable TCLP results. 5% wt./wt. dosage of EnviroBlend 50/50 HX met both criteria.