This is because the results of soil analysis. I found that arsenic (r. zenith.) of each channel. Contains the value soil quality standards beyond that used for housing and agriculture.
This is because the quality of the soil. Found that the arsenic (arsenic) are detected in all stations. Outweigh the soil quality standards for housing and agriculture.
However, due to soil quality analysis showed that the arsenic (arsenic), ในทุกสถานี monitoring Higher than the standard of soil quality for housing and agriculture.