isolated from the surrounding environment (groundwater.air rain).This isolation is accomplished Sanitary landfil -land fill that uses a clay liner to isolate the trash from the environment Municipal solid waste (MSW)landfill-landfill that uses a synthetic (plastic)liner to isolate the trash from the environment The purpose of a landfill is to bury the trash in such a way that it will be isolated from not decompose(腐烂)muct A landfill is not like a compost pile,where the purpose is to bury trash in such a way that it will decompose quickly. Proposing the Landfill for a landfill to he built the onerators have to make sure that they follow certain stens in most parts of the world,there are regulations that govern where alandfll can be placed and how it can operate.The whole process begins with mn proposing the landfill In the United States,taking care of trash and building landfills are local government responsibilities.Before a city or other authority can build a landfill.an environment impact study must be done on the proposed site to determine: the area of land necessary for the landfill the impact of the proposed landfill on the local environment and wildlife the historical value of the proposed site Building the Landfill Once the environmental impact study is the perm nits ar egranted and the funds h een raised,the n beg not already exist.There roads will be used by construction equipment,sanitation (services and the general public.After roads have been built,digging can begin.In the North Wake Country Landfill.the landfill began 10 feet below the road surface. What Happens to Trash in a Landfill? Trash pu t in a landfill w ill sta ay there for a very long time.Inside a landfill,there is little oxygen and little moisture.Under these conditions,trash does not break down very rapidly.In fact when old landfills have been dug up or sampled,40-vear-old newspapers have been found with easily readable print.Landfills are not designed to break down trash,merely to bury it.When a landfill closes,the site,especially the groundwater,must be monitored and maintained for up to30 How Isa Landfill Operated A landfill,such as the North Wake County Landfill,must be open and available every day. Customers are typically municipalities and construction companies,although residents may also use the landfill Near of the landfill is center where residents can materials (aluminum epapers and paper products) This s helps to reduce the amount of material in the landfil Some of these materials are banned from landfills by law because they can be recycled. As customers enter the site.their trucks are weighed at the scale house.Customers are charged tipping fees for using the site.The tipping fees vary from$per ton These feesisolated from the surrounding environment (groundwater, air, rain). This isolation is accomplished with a bottom liner and daily covering of soil. Sanitary landfill—land fill that uses a clay liner to isolate the trash from the environment Municipal solid waste (MSW) landfill—landfill that uses a synthetic (plastic) liner to isolate the trash from the environment The purpose of a landfill is to bury the trash in such a way that it will be isolated from groundwater, will be kept dry and will not be in contact with air. Under these conditions, trash will not decompose (腐烂) much. A landfill is not like a compost pile, where the purpose is to bury trash in such a way that it will decompose quickly. Proposing the Landfill For a landfill to be built, the operators have to make sure that they follow certain steps. In most parts of the world, there are regulations that govern where a landfill can be placed and how it can operate. The whole process begins with someone proposing the landfill. In the United States, taking care of trash and building landfills are local government responsibilities. Before a city or other authority can build a landfill, an environment impact study must be done on the proposed site to determine: the area of land necessary for the landfill the composition of the underlying soil and bedrock the flow of surface water over the site the impact of the proposed landfill on the local environment and wildlife the historical value of the proposed site Building the Landfill Once the environmental impact study is complete, the permits are granted and the funds have been raised, then construction begins. First, access roads to the landfill site must be built if they do not already exist. There roads will be used by construction equipment, sanitation (环卫) services and the general public. After roads have been built, digging can begin. In the North Wake Country Landfill, the landfill began 10 feet below the road surface. What Happens to Trash in a Landfill? Trash put in a landfill will stay there for a very long time. Inside a landfill, there is little oxygen and little moisture. Under these conditions, trash does not break down very rapidly. In fact, when old landfills have been dug up or sampled, 40-year-old newspapers have been found with easily readable print. Landfills are not designed to break down trash, merely to bury it. When a landfill closes, the site, especially the groundwater, must be monitored and maintained for up to 30 years! How Is a Landfill Operated? A landfill, such as the North Wake County Landfill, must be open and available every day. Customers are typically municipalities and construction companies, although residents may also use the landfill. Near the entrance of the landfill is a recycling center where residents can drop off recyclable materials (aluminum cans, glass bottles, newspapers and paper products). This helps to reduce the amount of material in the landfill. Some of these materials are banned from landfills by law because they can be recycled. As customers enter the site, their trucks are weighed at the scale house. Customers are charged tipping fees for using the site. The tipping fees vary from $10 to $40 per ton. These fees