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ENR > Transportation > Despite Rocky History, Pennsylvania Road Will Open - ENR | McGraw-Hill Construction
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| The discovery of sandstone laced with pyrite halted construction along a 1.5-mile segment of a politically controversial 15-mile section of the new north-south route (ENR 4/19/04 p.25). When exposed to air and water, pyrite creates a sulfuric acid that can contaminate streams and underground water.
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