Superfund Information Systems: Site Profile

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The Peninsula Boulevard Groundwater Plume site consists of an area within and around a tetrachloroethylene (PCE or perc) groundwater plume in Hewlett, New York. The groundwater flows toward the northwest, in the direction of the New York American Water Plant 5 Well Field, a source of drinking water. Since April 1991, the Plant 5 well water has been treated by a packed tower aeration system, also known as an air stripper. EPA issued a Record of Decision (ROD) in 2011, selecting groundwater extraction and treatment, as well as limited bioremediation, as the remedy to address the groundwater contamination.  The remedial design (RD) for the site’s groundwater treatment system, as well as the bioremediation, was completed in September 2016.  The designs have not yet been constructed.  EPA completed the remedial investigation to identify the sources of the groundwater contamination in May 2017, and in June 2017 issued a Proposed Plan outlining the preferred remedy for the source areas.

EPA placed the Peninsula Boulevard Groundwater Plume site on the Superfund Program’s National Priorities List in July 2004. EPA is addressing remediation activities at the site in phases, or operable units (OUs). EPA has designated two OUs for the site. OU1 addresses the cleanup of the contaminated groundwater at the Site. OU2 focuses on the sources of the groundwater contamination.

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What Has Been Done to Clean Up the Site?

As part of the OU1 investigation, EPA conducted vapor intrusion testing in the area of the site to determine whether or not residences were potentially impacted by vapors released from the groundwater plume.  Based on the results of this sampling, in 2009, EPA installed a sub-slab depressurization system at one residence.

The residences in the area of the site are serviced by the New York American Water Company (NYAWC). The NYAWC operates a well field approximately 1,000 feet north of the site. The water delivered to these residences is a blend of water from several well fields, including the well north of the site. Since 1991, NYAWC has been treating groundwater pumped from this well field with an air stripper prior to distribution.

Additional Vapor intrusion testing was conducted in March 2019.

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What Is the Current Site Status?

A ROD was issued in 2011 for the cleanup of the contaminated groundwater at the site, selecting groundwater pump and treat as the cleanup remedy. EPA started the RD for the OU1 selected remedy in January 2011. The RD was completed in September 2016. Construction of the OU1 remedy has not yet begun.

The sources of the groundwater contamination were not found during the OU1 RI. Therefore, EPA conducted a subsequent remedial investigation/feasibility study (RI/FS) to identify and define the source areas. As part of the OU2 investigation, sampling took place at several dry cleaners in the area between February 2012 and July 2016. In June 2017, EPA released a Proposed Plan for public comment, which identifies the preferred remedy to address the source areas. The ROD for OU2 was signed in September 2017 and the OU2 remedial design is underway. T

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