homework help?

Question

for my homework, i need to know, in landfill sites, how to prevent toxic chemicals from entering the soil, and water. Like from the big hole they dig to put all the garbage, before that, sumthing needs to be done so when the garbage comes, all the chemicals dont enter the soil and water.
plz help thanx^^

Answer 1

WHAT IS A BOTTOM LINER?

State-of-the-art plastic (HDPE) landfill liners are 100 mils or 1/10 of an inch thick.

It may be one or more layers of clay or a synthetic flexible membrane (or a combination of these). The liner effectively creates a bathtub in the ground. If the bottom liner fails, wastes will migrate directly into the environment. There are three types of liners: clay, plastic, and composite.