New York City Department of Environmental Protection: Briefing to the NYC Water Board on the Natural Gas Impact Assessment Project, Hazen and Sawyer/Leggette, Brashears and Graham(Joint Venture) , NYC Water Board, p.24 - 24, (2009)

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New York City Department of Environmental Protection.  12/23/2009.  Impact Assessment of Natural Gas Production in the New York City Water Supply Watershed.  24 pages.

See: Bruce Stutz. Mar. 25, 2010. "A Contoversial Drilling Practice Hits Roadblock in New York." Yale University. Environment360