EPA RCRA ID: PAD981739758

Disclaimer / Legal Notices   

The Resource Conservation and Recovery Act (RCRA) is the public law that creates the framework for the proper management of hazardous and non-hazardous solid waste. Corrective action is a requirement under RCRA that facilities that treat, store or dispose of hazardous wastes, or did so in the past, investigate and clean up hazardous releases into soil, groundwater, surface water and air. For more information, and for more information on RCRA-specific terms used on this page, please visit EPA’s umbrella RCRA web page or EPA’s RCRA Corrective Action page.

On this page:

• Cleanup Status
• Facility Description
• Contaminants at this Facility
• Institutional/Engineer Controls
• Enforcement and Compliance
• Related Information
• Contacts for this Facility 

Cleanup Status

The North Parcel of the DVW South Plant concluded the environmental investigation phase.  EPA will document a proposed remedy for the North Parcel in a Statement of Basis (SB) which will be made available for public comment in late 2026. 

Cleanup Background

EPA and the Delaware Department of Natural Resources and Environmental Control (DNREC) will oversee all investigations, interim actions, and cleanup activities conducted at the Facility.

A Notification of Hazardous Waste Activity was submitted to USEPA on July 28, 1980 based on the treatment, storage, and disposal of hazardous waste at the DVW. This submittal triggered RCRA corrective action at DVW.

In June 1986, AlliedSignal completed a RCRA Facility Assessment (RFA) in which 14 Solid Management Wast Units (SWMUs) and one Area of Concern (AOC) were identified on what is now DVW Facility property. In September 2000, the EPA issued an Administrative Order (Order) to General Chemical Corporation (GCC) pursuant to Section 3008(h) of RCRA which required a Facility-wide investigation and cleanup of the Facility. In 2000 then owner Honeywell entered into a Facility Lead Corrective Action Agreement with the EPA, and on September 14, 2011, Honeywell entered into an Administrative Order on Consent (ACO) with the EPA for investigation of the Facility. 

In September 2011, EPA issued an Administrative Order to Honeywell International Inc., which requires a facility wide investigation. The Administrative Order was issued pursuant to Section 3008(h) of the RCRA. The requirements of the order include:

• Interim measures/stabilization to achieve the initial goal of controlling ground water releases and controlling current human and ecological exposure to contaminated media.
• RCRA Facility Investigation (RFI), to provide more in-depth information about Solid Waste Management Units (SWMUs).
• Corrective Measures Study (CMS) if warranted, to propose final cleanup actions needed.

In April 2014, Honeywell initiated a project to construct a trailer loading dock and scale whose footprint extends over a portion of the location of SWMU 18. Honeywell prepared an Interim Measure Work Plan (IMWP) to excavate and remove impacted SWMU 18 soils which was submitted to EPA on April 15, 2014. The objective of the IM was to reduce exposure risk to construction workers involved in the project and reduce transfer loading of contaminants from soils into groundwater. IM excavation and removal activities were completed by Honeywell on April 21, 2014. 

Since then, the following phases of investigation and studies have been conducted at the North Plant:

• 2003 Phase I RFI
• 2004/2005 Phase II RFI
• 2015 Phase III RFI
• 2021 Phase IV RFI Report
• 2021 Demolition Investigation
• 2022 (Revised 2025) Corrective Measures Study

 The North Plant of the Facility concluded the environmental investigation phase in 2025.  The constituents of potential concern (COPCs) at the Facility are heavy metals, CVOCs, VOCs, and pesticides. EPA will document a proposed remedy for cleanup at the North Plant in a Statement of Basis (SB) which will be made available for public comment in late 2026. In 2025 Solstice Advanced Materials US, Inc purchased the Honeywell portion of the DVW facility and is the current owner.

Cleanup Actions or environmental indicators characterizing the entire facility are shown below. It is not intended as an extensive list of milestones/activities. This listing, and all the data on this page, come from EPA’s RCRAInfo and are refreshed nightly to this page. For this table and the Cleanup Activities Pertaining to a Portion of the Facility table that follows, a blank in the Status column could mean the action either has not occurred or has not been reported in RCRAInfo.

Cleanup Activities Pertaining to the Entire Facility  

 ^{For definitions of the terms used, hover over or click on the term.}

Facility Description

Link to a larger, interactive view of the map.

The Honeywell Facility, also known as Delaware Valley Works (DVW) Facility was a chemical manufacturing plant located in Claymont, Delaware and Marcus Hook, Pennsylvania. The Facility consists of approximately one hundred acres, which is divided by Route 13 into two separate plants, referred to as the “DVW North Plant” and “DVW South Plant”. Two-thirds of the DVW North Plant is located in Pennsylvania with the remainder situated in Delaware. The South Plant is further divided into northern and southern parcels. A variety of inorganic chemicals and pesticides were manufactured at the Facility during different periods since it began operation in the very late 1890’s. General Chemical Corporation (GCC) acquired the Facility from Allied Signal in 1986.  At that time, Allied Signal retained ownership of several contiguous parcels of the DVW North Plant property upon which chemical operations were conducted, and one inactive parcel in the DVW South Plant known as Solid Waste Management Unit 9 (SWMU 9). In October 2002, GCC and certain of its affiliates filed a voluntary petition in the United States Bankruptcy Court for the District of Delaware for reorganization relief. GCC subsequently emerged from bankruptcy under an approved Reorganization Plan in October 2003.  In 2004, Honeywell re-acquired the DVW North Plant from GCC. In 2025 Solstice Advanced Materials US, Inc purchased the Honeywell portion of the DVW facility and is the current owner. 

In September 2011, EPA issued an Administrative Order to Honeywell International Inc., which requires a facility wide investigation.  The Administrative Order was issued pursuant to Section 3008(h) of the RCRA.  

This website discusses the North Plant. SWMU 9 and South Plant information can be found here.

Contaminants at this Facility

Metals, volatile organic compounds and pesticides, are the main constituents of concern found in soils, sediments and groundwater at the facility.

Institutional and Engineering Controls at this Facility

Institutional controls, if required, will be determined at the time of remedy selection.

Institutional and Engineering Controls help ensure human exposure and groundwater migration are under control at a cleanup facility.   Where control types have been reported by states and EPA in EPA’s RCRAInfo, they are shown below.  Not all control types are needed at all facilities, and some facilities do not require any controls.  Where there are blanks, the control types may not be needed, may not be in place, or may not be reported in RCRAInfo.

Are Controls in Place at this Facility?

 For definitions of the terms used, hover over or click on the term.

Enforcement and Compliance at this Facility

EPA’s Office of Enforcement and Compliance Assurance (OECA) provides detailed historical information about enforcement and compliance activities at each RCRA Corrective Action Site in their Enforcement and Compliance Historical Online (ECHO) system. 

RCRA Enforcement and Compliance Reports from ECHO

Related Information

For more information about this facility, see these other EPA links:

• RCRA information in EPA’s Envirofacts database
• Information about this facility submitted to EPA under different environmental programs as reported in EPA’s Facility Registry Services
• Alternative Names for this facility as reported by EPA programs in EPA’s Facility Registry Services
• Cleanups in My Community  provides an interactive map to see EPA cleanups in context with additional data, and lists for downloading data
• Search RCRA Corrective Action Sites  provides a search feature for Corrective Action Sites

Documents, Photos and Graphics

Contacts for this Facility

EPA Region  implements and enforces the RCRA Corrective Action program for   and federally recognized tribes.

For further information on this corrective action site, use the Contact Information for Corrective Action Hazardous Waste Clean Ups listings that are accessible through Corrective Action Programs around the Nation.

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