Alkaline ash was found to be effective in reducing the metal availability of sludge, and acted as a good stabilization agent for SS [6]. Mixing FA with SS can produce a material that has more balanced properties and less potential for environmental contamination than either material applied alone [6–8]. Thus the use of FA–SS for amendment of soil solvestwo problems in a single attempt, where both components are complementary to each other in performing the mixture as a soil modifier.