As the woods were removed the soils eroded and leached; especially nitrogen easily leaches away. Water percolating through the waste leaches calcium hydroxide and becomes alkaline. The solution then percolates through the heap and leaches both the target and other minerals. The hydrothermal fluid leaches metals as it descends and precipitates minerals as it rises. The liquid leaches out a valuable fraction of proteins, nutrients and lactic acid. Plants are therefore healthier, and less fertilizer leaches into surface or groundwater. Because nitrate is more mobile, it leaches into groundwater supplies through agricultural runoff. This water then leaches into these salmon-bearing creeks. The active ingredient leaches out while the paint film stays mostly intact. With time and repeated use, the lead leaches from the glaze into the food. The Leaches moved to a house at 31 The Parade.