Tricholoethylene is a common and persistent groundwater contaminant. Previous research indicates that granular zero valent iron eliminates aqueous TCE through reductive dechlorination. The presence of iron and other metals in iron foundry slag, a by-product of the gray iron foundry industry, may promote similar degradation processes. Batch degradation and column studies are being conducted to characterize the reactivity of several foundry slags for use as reactive media in permeable reactive barriers, a common groundwater remediation technology.