The leachate concentrations from both tests were generally at least five times lower than the most stringent of the regulated limits.

Leachate concentrations of base cations were dominated by Ca2+ and were generally greater in the Alfisol than in the Spodosol leachates.

An important aspect of the proposed technique is that the mass of contaminant in the system is kept constant and so significant decrease in source leachate concentration occurs during each test.

All but two of the sludge samples subjected to the Ontario LEP passed the test when the leachate concentrations for metals are compared to the regulated limits governing the classification of hazardous waste material in Canadian jurisdictions.