We are rough grading a large commercial site and have encountered some underground springs--water is bubbling up to the surface. The original ground in these areas was holding water and it was a slough. The contractor pumped the standing water and began removing the saturated ground with the intention of padding in dry clay. There is about 5 feet of fill to be placed in this area which will eventually be a parking lot. When dealing with a spring is it better to try to place a seal of clay over top or would it be better to place a french drain of some sort to drain the water away?
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