Impact Assessment of Natural Gas Production in the NYC Watershed Client: New York City Department of Environmental Protection Location: Queens, NY In recognition of increased natural gas development activity in New York State and its potential to impact New York City’s water supply, the New York City Department of Environmental Protection (DEP) commissioned Hazen and Sawyer in joint venture to prepare an assessment of potential impacts to the NYC water supply from natural gas development utilizing hydraulic fracturing technology. The process required to extract gas from shale formations (such as the Marcellus Shale formation underlying much of WV, MD, PA, and NY), termed hydraulic fracturing, entails injecting large volumes of water, sand, and chemicals at high pressures into the formation

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