1. The first thing is to avoid the rocks
Underground situation is complicated and changeable, the formation of shallow layer (within thousand meters) is layered, and there will also have fold, fault, basement uplift, depression and other geological phenomena. If it is not a fixed location, it is difficult to use an underground condition of area somewhere to illustrate the specific location of the underground geological conditions. In other words, if a certain spot is mud underground about 50 meters, and adjacent to 10 meters of the spot, it may be outcropped sandstone or volcanic rocks on under the surface of the earth.

2. Generally speaking, the sites need drilling wells should be the suburb or small town or rural areas. For these locals’ sewage or drainage facilities are not perfect, which are easy to pollute wells. Some urban areas or villages have farmlands or vegetable patches, and today’s crop is poured with fertilizers and pesticides, which are not easy to break down in the land, and will be seeping into the ground with the water, so, drilling machine needs to move away from pollution.

If surrounded farmland or vegetable patches are inevitable, we suggest you’d better drill some deep wells, and around the well, some seepage prevention treatments will be done, such as using cement hollow cylinder to form isolation, etc.