Network Monitors Water Quality in Shale Gas Drilling Region High-pressure injection of water, sand and chemicals that fracture shale deposits deep underground to free trapped natural gas is employed by drillers tapping the Marcellus shale beds, a geologic deposit that stretches from central New Y ork to Virginia and contains gas be- lieved to be worth hundreds of billions of dollars. The process, called hydraulic frac- turing, or frackin

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