The Patchogue former MGP Site is approximately 3.6 acres in area, located at 234 West Main Street in the Village of Patchogue, Town of Brookhaven, Suffolk County, New York   The Site is in a mixed commercial and residential area, and is currently undeveloped.  It is south of Main Street, east of River Avenue and adjacent to Patchogue River, just south of where the river exits Patchogue Lake. An overflow pond is also located south/southwest of the site. The site is currently vacant and the southern portion of the property is overgrown with brush and trees. The site is secured by locked perimeter fencing. Private properties border the site.
The Site is informally divided into three areas:  Northern, Central/Core Area, and Southern. 

The Northern area is rectangular and bordered by West Main Street on the north, an unpaved access road beyond which is a commercial property to the east, the Central/Core area to the south and a commercial area of Patchogue, fronting West Main Street, to the west.  The Northern area is enclosed with a chain link fence and is mostly clear.  The surface is comprised of two adjacent concrete slabs with a combined size of approximately 240 feet by 60 feet.

The Central/Core area is rectangular and is where the majority of the former MGP structures were located.  The area is bounded by the Northern Area to the north, a commercial property and the Patchogue River to the east, the Southern Area to the south and commercial/residential area of Patchogue to the west.  The area is enclosed by a chain-link fence, sparsely vegetated and is uneven due to fill material.  A steep slope runs along the western boundary of the Site, beyond which is a residential area and municipal storage yard.

The Southern Area is bounded to the north by the Central/Core Area and comprises the tapered end of the property with the Patchogue River forming the eastern boundary of this area.  This area has considerable concrete debris and dense vegetation. 

The Site initially was owned and operated by the Patchogue Gas Company either independently or, in the later years of its operations in the mid 1920’s under ownership of the Long Island Lighting Company.  In 1914, the facility was converted into a high pressure gas distribution and storage facility.  High pressure gas purchased from Suffolk Gas & Electric) was distributed from the Patchogue Plant from 1915 through 1917.  From 1918, the gas supplier is identified only as LILCO.  Emergency gas production occurred at the Site from 1922 until 1927. 
Retorts are reported to have been identified on the Site which suggests that the initial gas production process was coal gasification.  However, the Lowe water gas process was listed in Brown’s Directory, a source of historical information about MGPs.  The 60,000 cubic foot gas holder, initially present on the Site, is consistent with the limited production of water gas at the facility.  The gas sphere present during later operations stored gas under high pressure and is consistent with the use of the Patchogue facility for distribution of gas produced elsewhere. A group of seven horizontal aboveground storage tanks (ASTs) were installed sometime after 1910.  These ASTs were used for additional gas storage capacity at the Site.
 LILCO sold the property in 1976 but retained 7,800 square feet of easements for existing facilities.  LILCO was acquired by Brooklyn Union Gas in 1999 and the two merged to form KeySpan.  National Grid acquired KeySpan in 2008 and currently maintains ownership of the Site, which was reacquired by KeySpan in 2005. 

On September 30, 1999, KeySpan (a predecessor company to National Grid) entered into Order on Consent D1-001-99-05 with NYSDEC to conduct a Preliminary Site Assessment (PSA) of the Former Patchogue MGP Site.  The PSA was conducted in 2001 and the results were documented and submitted to the NYSDEC in March 2002 in a report titled “Preliminary Site Assessment Report” (VHB, 2002).  In 2008, RI activities were performed and the results were documented and submitted to the NYSDEC in December 2009. The results of the Final RI are summarized on the Project Description tab of this website and the complete Final RI Report is accessible on the Key Documents/Major Reports tab.