How do you prevent smells from soil pipes going into a cesspit or soak away?

If you are refering to the one study island question about growing plants on top of a hill, then the answer is MAKE THE PLOW LINES RUN ACROSS THE SIDES OF THE HILL.

topsoil eroison

The chemicals from the trash do not seep into the soil, damaging it.

The grass roots bind the soild together

Get him something that he likes. Something he doesnt have already. Going off to the Marines doesnt mean he is completely different person. Give him something he can leave with or come home to. I...