| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the discharge of pollutants or the diffusion of polluted ground water surely and to clean a polluted area in a long-term. SOLUTION: To an excavated ditch K reaching the depth of water impermeable stratum 6, a poorly water-permeable membrane 2 is installed along the ditch wall surface of the polluted area side, water-impermeable membrane 4 is installed along the ditch wall surface of the pollution preventing area side, a water-permeable material such as sand, gravel, and crushed stones is packed in the space between the membranes 2 and 4, and a water-filled water-permeable layer 3 to be controlled at least at a higher water level than that of the polluted area side is formed.</p> |
