1. the fence around the area away from the edge of the hole, not less than 15 m in order to prevent harm to people or animals, fell into a pit with banners are not permitted.2. let the official know, such as the district and sub-district of natural resources and environment, Department of mineral resources, or to check the condition of the area and geological characteristics.3. do not dispose of waste or toxins in the hole because it will cause contamination in groundwater sources.4. the hole collapsed with the stones. Use the large chunk before the landfill to prevent them being borne away with underground water and land reclamation off the plywood according to the different holes.5. prohibit planting, building on such areas unless the monitoring of underground structure, characteristics, and then.6. this area is water hardness makes a gallstone. At least have to boil it before drinking.
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