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Yuanmingyuan (Old Summer Palace) Park Seepage Control Environmental Protection Project
In recent years, water seepage under the Old Summer Palace has been a huge problem for 
the Beijing government. To stop the seepage, ideas had been proposed for a plastic membrane 
to be placed over the substrate. ET Group’s chief scientific expert Dr. Tan, consulted by the local 
authorities, realized the harmful ecological impact the proposed plan would have on the ecosystem 
of the park. Using the theory of water-soil interface exchange, he developed an innovative clay 
engineering seepage control system. By using clay, some water is allowed to pass through the s
ystem, preventing both seepage and overflow without harming the natural environment. The system 
Dr. Tan helped lay is in place to this day and has brought yearly water seepage to safe and 
replenish-able levels. 


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