Holey Concrete by ProQuest

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Williamsburg city planners have billed a seven-acre parking lot, which will serve a mall expansion, as the largest pervious concrete project in the US. The concrete allows rainwater -- which can become polluted with drips of oil, gas, dirt, and chemicals -- to filter back harmlessly into groundwater supplies instead of washing off and damaging nearby creeks or streams. The gray, porous concrete allows rainwater to pass through to the ground below -- while still providing a flat, stable parking lot.

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