The samples from 10 stations were collected at the Onnuch Solid waste Disposal Site and waterways nearby in May and July, 1992. At the Nong kham Solid Waste Disposal Site and waterways nearby, samples from 7 stations were collected in June and August, 1992. The samples from the Sites were analyzed scientifically by the Flame Atomic Absorption method to identify any heavy metals and other related parameters. The study found that the sediment in leachate storage pool at the Onnuch Site was contaminated by mercury, cadmium and manganese approximately equivalent to 2.377, ND and 311.0 ug/g, respectively which were higher than waterways nearby. At the Nongkham Site, those heavy metals were also found which were 0.663, ND and 845.8 ug/g. respectively. The amounts of heavy metals in sediment detected at Nongkham Site were not different significantly from the sediment in waterways nearby. When analyzed statistically at 0.05 degree of freedom, mercury collected from the Onnuch Site was compared the different in quantity in May and in July and show that there were different and related to some independent variables (pH, CEC). But the amounts of manganese were not different and not related to any independent variables (pH,organic matter,CEC). At the Nongkham Site, the amounts of mercury collected in June and August were not different and related to some independent variables (pH organic matter). The amounts of manganese showed the results in the same way. Furthermore, the mercury and manganese accumulated in sediments from the 2 sites were much more than from the leachate, especially the amounts of mercury were much more than in sediment in other water resources (0.070-0.100 ug/g) which also showed that the contamination of heavy metals might cause some effects on the ecosystem, if the water resources were still contaminated by heavy metals from leachate discharged from the waste disposal sites and domestic waste water nearby.
