The former limestone quarry in Batavia, Illinois has been leaking 250,000 gallons per day despite the thick soil and clay layers beneath the 43,000 square foot swimming area. Removal of a Fox River dam has changed the hydrostatic pressure acting on the site and lowered water levels, thus increasing the leakage. Engineers from AECOM recommended installation of a geomembrane liner; that proposal has been approved with a $134,000 contract.

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