The Equity MGP facility was constructed in 1892 by the Equity Gas Works Construction Company. It operated from 1893 to 1929. Brooklyn Union Gas (BUG), a subsidiary of National Grid, acquired the MGP in approximately 1903. The MGP is first evident on 1903 and 1905 BUG facility maps with gas generation, gas storage (430,000 cu. ft relief holder), and cleaning (purifier house) equipment/processes in place. Support facilities included coal storage/delivery facilities and miscellaneous tar and oil storage capacity, including tar wells, tar separators, drip tanks, and gas oil tanks.

The 1907 Sanborn map shows a consistent, although slightly more extensive, plant layout. The plant appears to be developed to its maximum extent on a 1921 BUG facility plan, although largely maintaining the layout shown on the earlier 1903 and 1905 plans. A 1932 BUG plan indicates that the relief holder was partially decommissioned, and the 1933 Sanborn map shows that the gas manufacturing equipment has been removed with the former purifying house and generator house buildings present but vacant. The 1951 Sanborn shows the lot being owned by BUG and is vacant with the exception of two small buildings near the southern edge of the Site.  BUG maintained ownership of the property until September of 1951. Subsequently, the Site was used by unknown parties for storage (pipe and valves) for the period of 1965 to 1981 and appears to be vacant during the period of 1986 to 1988. The Site has been used as a solid waste transfer facility from about 1989 to the present under the ownership of various private parties. Under current conditions, there are no known complete exposure pathways for potential receptors in the RI Study Area because of the existing structures and surface cover (concrete or asphalt), current use, and activities at the properties.

The RI was performed pursuant to a Multi-Site Order on Consent and Administrative Settlement, Index #A2-0552-0606, executed on February 22, 2007 and modified on August 10, 2007, between BUG (now d/b/a National Grid NY) and the New York State Department of Environmental Conservation (NYSDEC). The RI was performed to identify sources of environmental impacts, delineate the associated extent of impacts, determine the surface and subsurface conditions in the area of the Site, and evaluate potential off-Site migration pathways and their potential contributions to media and receptors.

The results from the RI are appropriate to assess the potential for exposure to constituents present in impacted soils, groundwater, soil vapor, and indoor air. Under current conditions, there are no known complete exposure pathways for potential receptors in the RI Study Area because of the existing structures and surface cover (concrete or asphalt), current use, and activities at the properties. Future construction workers who perform excavation work in areas on or adjacent to the Site may potentially be exposed to impacts in subsurface soil and groundwater. The potential construction worker pathway on-site is currently addressed by an Interim Site Management Plan that prohibits subsurface work without the use of OSHA-trained personnel.