Soil investigation indicated that virtually the entire site below 1.5 m AHD comprises at least some actual acid sulphate soils. However, the actual acid sulphate soils are confined to the regions below the 1 m AHD surface contour, mainly below the 0.5 m AHD surface contour. In these circumstances, it is likely that the acid production and acidification at East Trinity have strongly degraded the land within the drained area and adversely affected the environment for many years to come unless remedial actions are implemented