Untreated composite of arsenic impacted soil, “average”, soil concentration result was 3,720 mg/kg; untreated “high” arsenic impacted sample was 6,330 mg/kg. Average sample resulted leaching of 18.9 mg/L in TCLP prior to treatment. A dosage rate of 1% wt./wt. EnviroBlend HXD reduced arsenic leachability to 0.69 mg/L. The highly impacted area, untreated sample leached at 50.6 mg/L in TCLP testing. Dosage of 2% wt./wt. met TCLP criteria, and further dosage dropped the concentration of leachable arsenic.