The NYC Planning website has a list of recent Environmental Impact Statements in draft and final form.
You can also learn more about the environmental review process in NYC.
The City Environmental Quality Review (CEQR) "is the process by which New York City agencies determine what effect, if any, a discretionary action they approve may have upon the environment."
Environmental Impact Statement Database (EPA)
ProQuest's Agricultural and Environmental Science Database contains EISes.
Be sure to check the Environmental Impact Statements box before you search:

Northwestern's Transportation Library holds print copies of most pre-2012 EISs, and digital copies of later EISs.The majority of their holdings were digitized by Google and made available through HathiTrust.
The Transportation Library's EIS guide is very helpful in getting started and searching their collections.