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1. Introduction
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1.1 Background
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Site Number: |
A3XL |
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Contract Number: |
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D.O. Number: |
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Action Memo Date: |
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Response Authority: |
CERCLA |
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Response Type: |
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Response Lead: |
EPA |
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Incident Category: |
Removal Assessment |
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NPL Status: |
Non NPL |
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Operable Unit: |
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Mobilization Date: |
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Start Date: |
10/5/2016 |
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Demob Date: |
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Completion Date: |
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CERCLIS ID: |
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RCRIS ID: |
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ERNS No.: |
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State Notification: |
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FPN#: |
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Reimbursable Account #: |
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1.1.1 Incident Category
1.1.2 Site Description
The Newark South Groundwater Plume Site includes
approximately 164 acres located in southeast Newark, New Castle County, Delaware. The Site is located in a mixed industrial,
commercial and residential area.
Groundwater in the area has been found to be
contaminated with volatile organic compounds including tetrachloroethene (PCE)
and trichloroethene (TCE). Investigations conducted by the Delaware Department of Natural Resources and Environmental Control (DNREC) have identified several potential source areas.
The City of Newark has reported the presence of low levels of the contaminants
in the untreated/raw groundwater from several of its public supply wells since
2000. The public drinking water supplied by the City is treated to remove the
contaminants from the untreated/raw water and continues to meet Federal and
State Safe Drinking Water Act standards.
Several communities in the area receive their drinking water from SUEZ Delaware
Water (formerly United Delaware Water). The water provided by SUEZ draws
surface water from the White Clay & Red Clay Creeks and is not affected by
the local groundwater contamination. The drinking water supplied by SUEZ meets
Federal and State Drinking Water Standards.
DNREC recommended additional investigations be conducted to determine the
source(s) and extent of the contamination. The State of Delaware has referred
the Site to EPA for further consideration. EPA is considering the Site for
potential inclusion on the National Priorities List (NPL). The NPL is a list of
sites that are eligible for cleanup financed under the Federal Superfund
program.
1.1.2.1 Location
The Site includes approximately 164 acres located in southeast Newark, generally west of Route 72 (South Chapel Road), between Bellevue Road and Route 4 (East Chestnut Hill Road) in New Castle County, Delaware.
1.1.2.2 Description of Threat
EPA’s Removal Program will evaluate the potential for vapor intrusion at the Site. Vapor intrusion (VI) is the term used to describe the migration of volatile chemicals from subsurface contaminated soils and groundwater into the indoor air spaces of overlying buildings through openings in the building foundation. The chemicals may present health risks to residents if they accumulate in buildings. Common sources of VI include petroleum products, dry cleaning solvents, and other industrial solvents and degreasers including those found at the Site.
1.1.3 Preliminary Removal Assessment/Removal Site Inspection Results
While EPA is
considering the Site for potential inclusion on the NPL, EPA Region 3 management asked the
Removal Program evaluate whether VI is a concern at the Site. The OSC subsequently reviewed available
information and environmental sampling data included in DNREC's 2015 Site Investigation (SI) report.
As part of the SI, 68 groundwater
samples were collected from multiple depths at 15 locations. Permanent monitoring wells were installed at
eight of the locations. PCE was detected
in seven of the eight monitoring wells.
During the SI, Delaware’s Division of Public Health Office of Drinking
Water sampled three municipal wells and confirmed low levels of groundwater
contamination in the untreated/raw groundwater.
The SI summarizes the Preliminary Assessment (PA) that was conducted at the
Site by DNREC. The PA identified multiple areas of potential
environmental concern in the area.
The OSC initiated a removal site evaluation in accordance with Section 300.410 of the National Oil and Hazardous Substances Pollution Contingency Plan (NCP). As part of the preliminary assessment activities, the OSC conducted several site visits, met with DNREC representatives and EPA site assessment staff. The OSC also met with the EPA Region 3 vapor intrusion team and the Agency for Toxic Substances and Disease Registry (ATSDR) to review existing groundwater sampling data and discuss the potential for VI occurring at the Site.
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2. Current Activities
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2.1 Operations Section
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2.1.1 Narrative
In October 2016, to assist with conducting the removal site evaluation, the OSC issued a work assignment to EPA's Superfund Technical Assessment and Response Team (START) contractor, Weston Solutions, Inc. (Weston).
In November 2016, the OSC conducted a site visit with a Weston representative. Later the same day, the OSC attended a public meeting held by DNREC. DNREC held the meeting to provide information regarding site investigations and to let the community know that Delaware has requested assistance from EPA in addressing the contamination at the Site.
In January 2017, EPA mailed out fact sheets to the surrounding community to let them know about EPA's upcoming activities.
2.1.2 Response Actions to Date
2.1.3 Enforcement Activities, Identity of Potentially Responsible Parties (PRPs)
2.1.4 Progress Metrics
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Medium |
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Manifest # |
Treatment |
Disposal |
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2.2 Planning Section
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2.2.1 Anticipated Activities
EPA is planning to install new groundwater monitoring wells in commercial areas along
South Chapel Street and in residential areas to the east. Efforts will focus on evaluating contamination
in the shallow groundwater. Water samples will be collected from the new
wells and from several existing groundwater monitoring wells.
The samples will be sent to a lab and analyzed for the presence of
volatile organic compounds (VOCs). The sampling
results should help EPA determine whether homes and/or businesses in the area
should be sampled to determine if VI is a concern.
The Delaware Department of Transportation (DelDOT) has given EPA permission to install groundwater monitoring wells in State right-of-ways. Weston has ordered a utility mark-out for the locations planned for the right-of-ways. EPA is also working to obtain access to install several new monitoring wells on private property.
Field activities, including well installation/construction, are anticipated to begin the last week in January.
2.2.1.1 Planned Response Activities
2.2.1.2 Next Steps
Weston is working to secure a well driller for the installation of the monitoring wells.
Weston is preparing a field sampling plan and quality assurance/ analysis plan for EPA review.
The OSC will continue to work with DNREC during the removal site evaluation.
2.2.2 Issues
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2.3 Logistics Section
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No information available at this time.
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2.4 Finance Section
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No information available at this time.
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2.5 Other Command Staff
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No information available at this time.
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3. Participating Entities
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3.1 Unified Command
3.2 Cooperating Agencies
City of Newark
Delaware Department of Natural Resources and Environmental Control (DNREC)
Delaware Division of Public Health Office of Drinking Water (DPH ODW)
Centers for Disease Control and Prevention (CDC) /Agency for Toxic Substances and Disease Registry (ATSDR)
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4. Personnel On Site
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No information available at this time.
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5. Definition of Terms
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No information available at this time.
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6. Additional sources of information
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No information available at this time.
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7. Situational Reference Materials
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No information available at this time.
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