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Why shipyard activities create contamination
A shipyard brings many contaminant-generating operations together in a small area. The type and amount released depend on the vessels handled, the age of the facility, the materials used, drainage and geology, and how wastes were managed. The U.S. Environmental Protection Agency (EPA) notes that each facility is unique, while identifying recurring activities at ship and boat building or repair yards.
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Cleaning, surface preparation and painting
Pressure washing can remove paint solids and heavy metals from hulls and equipment. Sanding, abrasive blasting and other surface-preparation work generate spent abrasives, paint particles, metals and dust; solvents may be used during preparation or cleanup. Painting and coating operations can release paint and thinner through overspray, spills, stripping, sanding and wash-down water. If these materials are used on uncontained ground or if wash water enters drains, contaminants can be carried away from the work area.
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Engine repair and equipment maintenance introduce used lubricants, coolants, fuels, battery materials and parts-cleaning solvents. Fluid changes, leaks and accidental spills can soak into soil. Parts washing can create a liquid waste stream containing petroleum and solvents; storing that waste in damaged or poorly protected containers adds another release route.
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Fueling, storage and waste handling
Fueling areas, aboveground or underground tanks, drums, transfer lines and loading zones can release petroleum through overfills, hose failures, corrosion or leaks. Liquid chemical storage has similar risks. Waste storage areas can contaminate soil when containers are damaged, rainwater contacts residues or incompatible wastes react. Historic fill, landfills, buried debris and industrial disposal can remain sources long after a shipyard operation changes or closes.
Welding, fabrication and vessel washing
Welding and metal fabrication create metal-bearing dust and residues. Vessel washing can mobilize paint fragments, corrosion products and oils. Without collection and treatment, those materials may be deposited on paved surfaces, in drainage structures or on adjacent soil and sediment.
Which contaminants are found at shipyards?
There is no universal shipyard contaminant list. EPA guidance identifies paint solids, heavy metals, solvents, oils and fuels as common categories. A contaminant found at one facility may be absent at another, so sampling and historical review are essential.
Common chemical groups
- Metals: Paint and abrasive residues can contain metals; batteries, welding and metalworking add other metal sources.
- Petroleum compounds: Fuels, lubricants and hydraulic fluids can leave oil-related contamination in soil or groundwater.
- Solvents: Parts cleaning, paint thinning and stripping can release volatile or chlorinated solvents.
- Paint-related chemicals: Coatings and their breakdown products may occur in soil, drainage systems and sediments.
Contaminants documented at a specific Superfund shipyard
EPA’s August 2023 proposed-deletion notice for Portsmouth Naval Shipyard in Maine reported PCBs, polycyclic aromatic hydrocarbons (PAHs), metals and benzene in soil, groundwater and sediment. Those findings reflect that site’s shipbuilding, submarine-repair, landfill, spill, piping, battery-storage, fill and river-outfall history; they are not a prediction for every shipyard.
Other site profiles show how different the mix can be. Norfolk Naval Base (Sewells Point Naval Complex) includes solvents, corrosives, paint and electroplating wastes, petroleum products, oils and PCBs. Hunters Point Naval Shipyard includes petroleum fuels, pesticides, heavy metals, PCBs, volatile organic compounds, radionuclides, naturally occurring asbestos and naturally occurring metals. These examples demonstrate why a site investigation must be based on actual operations and analytical results.
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How contamination moves beyond the work area
Contamination is not confined to the surface where a spill occurred. The relevant media and pathways can include soil, groundwater, stormwater, storm drains, sediment and direct discharges.
Infiltration from soil to groundwater
Rain and wash water can carry dissolved chemicals through soil. Contaminants that do not dissolve may remain in soil as a continuing source, while dissolved compounds move with groundwater. The speed and direction depend on soil type, depth to the water table, bedrock, hydraulic gradients and buried utilities or fill.
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Runoff can pick up paint particles, metals, oil and sediment from work surfaces and storage areas. Storm drains may transport that mixture to outfalls, creeks, harbors or low-lying sediment. Drainage structures themselves can accumulate contaminated sediment and become a source during maintenance or heavy rain.
Surface-water and sediment deposition
Direct discharges, river outfalls and eroded soil can move contaminants into surface water and sediment. Sediment can later be disturbed by dredging, vessel traffic, floods or construction, remobilizing contaminants.
Vapor and exposure pathways
Some volatile chemicals in soil or groundwater can migrate as vapor into buildings or utility corridors. People may also contact contaminated soil or sediment, inhale dust, or ingest contaminants transferred from dirty hands. Which pathways matter depends on concentrations, land use and whether people or ecological receptors are present.
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What a responsible investigation must establish
Cleanup cannot be selected intelligently until the site team understands where contamination is, how it is moving and who or what could be exposed. A practical investigation normally addresses the following questions.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware match- What happened historically? Review shipyard operations, vessel types, chemical inventories, tank and piping locations, waste areas, fill placement, outfalls, spills and former buildings. Historic records and interviews can identify sources that are no longer visible.
- Where are the sources now? Inspect paint and blasting areas, repair bays, fueling points, storage yards, drains, separators, tanks, lagoons, landfills and visibly stained soil. Source areas should be distinguished from areas affected only by migration.
- Which media are affected? Design sampling for surface and subsurface soil, groundwater, stormwater, storm-drain sediment, surface water and, where relevant, sediment and indoor air or soil gas.
- How far and how deep has contamination traveled? Delineate horizontal and vertical limits, groundwater flow direction and any connection to property boundaries, drinking-water wells, wetlands or navigable waters.
- What receptors and uses must be protected? Evaluate workers, nearby residents, utility workers, visitors, aquatic life and future construction or residential uses. Land use can change the acceptable exposure assumptions.
- Are releases still occurring? Leaking containers, active drains, damaged pavement, unsealed blasting areas or operating tanks must be controlled before or alongside remediation.
How cleanup decisions are made
EPA’s groundwater framework centers on four linked objectives: understand the plume and its sources, stop continuing releases, reduce unacceptable exposure and migration, and restore or protect groundwater where practicable. A remedy can combine technologies for different contaminants and media; no single method fits every shipyard.
1. Control the source first
Removing leaking tanks, repairing pipes, improving chemical and waste storage, covering contaminated work areas and managing stormwater can prevent new contamination from overwhelming a remedy. Source control is particularly important before downstream sediment work, because an uncontrolled upland source can recontaminate a newly dredged or capped area.
2. Treat or remove contaminated soil
Excavation can remove highly contaminated soil for permitted treatment or disposal. Where excavation is impractical, soil may be treated in place, covered or capped. Covers and caps reduce direct contact, windblown dust and rain infiltration, but they leave contamination in place and require inspection, repair and restrictions on digging.
3. Address groundwater
Groundwater remedies are selected according to contaminant properties, plume behavior, geology and the need to protect wells or surface water. Extraction and above-ground treatment can remove dissolved industrial solvents, metals and fuel oil and can help contain a plume. In-situ treatment applies chemical oxidation or reduction, biological treatment or a permeable reactive barrier within the aquifer without pumping all groundwater to the surface.
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4. Contain where complete removal is not feasible
Slurry walls, sheet-pile walls and other subsurface barriers can limit groundwater movement. Containment reduces migration but does not itself destroy or remove contaminants, so it normally requires monitoring and maintenance.
5. Use monitored natural attenuation selectively
Natural processes may reduce contaminant concentrations or mass, but EPA generally considers this approach suitable only where migration potential is low and the relevant processes are demonstrably protective. Preference is given to processes that degrade or destroy contaminants rather than merely dilute or disperse them. Monitoring must verify that concentrations and plume boundaries behave as predicted.
6. Control exposure and future land use
Institutional controls can prohibit groundwater use, restrict excavation, require soil-management plans or limit property uses. They are often paired with caps, barriers and monitoring when contamination remains beneath a site. Controls must be recorded, communicated to future owners and checked over time.
Cleanup options compared
| Approach | Primary medium | What it does | Main strengths | Important limits |
|---|---|---|---|---|
| Excavation and off-site treatment or disposal | Soil and source materials | Physically removes contaminated material | Rapid source reduction and clear volume control | Requires handling, transportation and an approved destination; excavation may be constrained by buildings, utilities or waterfront structures |
| Soil treatment, covers or caps | Soil | Treats contamination in place or isolates it from people and rain | Can reduce contact and infiltration without removing all soil | Residual contamination remains; covers require inspection, repair and controlled digging |
| Pump-and-treat | Groundwater | Extracts groundwater for above-ground treatment and can contain a plume | Controls migration while treating dissolved solvents, metals or fuel oil | May operate for years; effectiveness depends on aquifer conditions and contaminant release from soil |
| In-situ treatment | Groundwater or soil | Injects or places reactive treatment without full extraction | Less surface handling and useful where excavation is disruptive | Requires good subsurface contact and verification that treatment reaches the plume |
| Subsurface barriers | Groundwater | Restricts plume movement | Protects receptors where immediate hydraulic control is needed | Contains rather than destroys contamination and requires long-term monitoring |
| Monitored natural attenuation | Groundwater or sediment | Relies on verified natural degradation or immobilization | Low physical disturbance where conditions are protective | Not appropriate when migration is significant; requires evidence and continued monitoring |
| Institutional and land-use controls | All media | Limits contact, groundwater use or intrusive work | Protects people when contamination remains in place | Depends on reliable enforcement, records and compliance |
Stormwater prevention is part of remediation
For active yards, preventing new releases is as important as treating legacy contamination. EPA recommends a hierarchy that starts with good housekeeping and source reduction, then adds engineered best-management practices where needed.
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- Contain blasting, sanding, painting and pressure washing so solids and wash water do not reach soil or drains.
- Keep debris, drums, batteries, used oil and other wastes under cover and on surfaces that prevent infiltration.
- Inspect tanks, hoses, transfer points, separators, curbs and drainage structures for leaks, corrosion and accumulated sediment.
- Maintain spill kits, train employees in immediate response and document releases and corrective actions.
- Use stormwater controls and treatment where prevention alone cannot meet discharge requirements.
- Sample storm drains, outfalls and sediment when they could be receiving contaminants from upland operations.
For the Todd and Lockheed shipyard sediment remedy, the consent decree requires identifying and controlling sources across soil, groundwater, stormwater, storm-drain sediments and permitted or unpermitted discharges before sediment remediation. It also requires monitoring during dredging and cap placement and long-term cap maintenance. The sequence illustrates why a downstream sediment remedy can fail if upland sources remain active.
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What long-term stewardship looks like
Construction completion does not necessarily mean a site is unrestricted. Monitoring may track groundwater concentrations, plume boundaries, cap performance, stormwater quality or ecological recovery. Operation and maintenance can include pumping and treatment, barrier inspections, drainage upkeep and repairs to covers. Five-year reviews are used at many Superfund sites where contamination remains or controls are required.
EPA’s Portsmouth Naval Shipyard notice in August 2023 said cleanup work was complete and proposed deleting the site from the Superfund list, while operation, maintenance, monitoring, land-use controls and five-year reviews would continue. That status is limited to the cited notice and should not be read as a statement about later developments.
What site examples show about differing remedies
Norfolk Naval Base, Virginia
EPA’s profile for the Sewells Point Naval Complex describes contamination associated with solvents, corrosives, paint and electroplating wastes, petroleum products, oils and PCBs in soil, sediment and groundwater. The profile reports a construction-complete milestone in 2010, continuing operation and monitoring, and additional work for specific areas. The combination of media and continuing obligations shows that “construction complete” is not the same as unrestricted use.
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Hunters Point Naval Shipyard, California
EPA lists petroleum fuels, pesticides, heavy metals, PCBs, volatile organic compounds, radionuclides, naturally occurring asbestos and naturally occurring metals at Hunters Point. Remedies include soil removal and covers, barriers, monitoring and institutional controls. Cleanup and monitoring are ongoing, with the Navy as lead cleanup agency and EPA and the California Environmental Protection Agency providing oversight.
Portsmouth Naval Shipyard, Maine
The Portsmouth example links contamination to shipbuilding and submarine repair, landfill operations, industrial spills and leaking piping, battery and material storage, fill and river outfalls. EPA’s August 2023 notice reported PCBs, PAHs, metals and benzene in soil, groundwater and sediment and proposed deletion after cleanup work was complete, subject to continuing stewardship measures.
These sites are illustrations, not templates. Their contaminants, agencies, remedies and status cannot be transferred automatically to another shipyard.
Practical priorities for owners and construction teams
- Pause ground disturbance until records and environmental constraints are reviewed. Excavation, dewatering and utility work can spread contamination or expose workers.
- Map sources and pathways before choosing a remedy. Include drains, outfalls, tanks, fill, groundwater flow and adjacent sediment—not only visibly stained soil.
- Keep active operations from recreating the problem. Use containment, covered storage, spill response and controlled wash-water handling during construction and ongoing yard work.
- Coordinate soil, groundwater and stormwater decisions. A soil remedy that ignores a leaking pipe or contaminated drain can be recontaminated.
- Write long-term obligations into property and construction plans. Caps, monitoring wells, groundwater restrictions, soil-management procedures and reporting duties must remain workable after the project team leaves.
The central principle is straightforward: identify and stop sources, understand how contaminants move, then combine removal, treatment, containment and exposure controls that match the site’s geology, land use and receptors. Monitoring verifies that the selected remedy remains protective as the shipyard and surrounding community change.
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