Phase 2 Environmental Site Assessment

A Phase 2 Environmental Site Assessment, also written as a Phase II ESA, involves physical sampling and laboratory analysis to confirm or rule out contamination identified during a Phase 1 ESA. If your Phase 1 report identified Recognized Environmental Conditions (RECs), a Phase 2 is the next step to determine whether actual contamination exists on the property.

Phase 2 ESAs are conducted by licensed environmental professionals and follow the ASTM E1903 standard. The assessment involves collecting soil, groundwater, and soil vapor samples and sending them to accredited laboratories for analysis.

When a Phase 2 ESA Is Needed

A Phase 2 ESA is typically triggered by one of the following situations:

• Phase 1 identified RECs. The most common trigger. If the Phase 1 report found evidence suggesting contamination (historical industrial use, regulatory database listings, site observations), the environmental professional will recommend a Phase 2 to investigate further.
• Lender requirement. Some lenders require Phase 2 testing for certain property types (gas stations, industrial facilities, dry cleaners) regardless of Phase 1 findings.
• Voluntary investigation. Property owners sometimes order a Phase 2 proactively to establish baseline conditions before a sale or to address concerns raised during due diligence.
• Regulatory requirement. State environmental agencies may require Phase 2 testing as part of a brownfield redevelopment, voluntary cleanup program, or enforcement action.

What a Phase 2 ESA Includes

Sampling Plan Development

Before any field work begins, the environmental professional develops a sampling plan based on the Phase 1 findings. The plan identifies the types of samples to collect, the number and location of sample points, the depth of borings, and the laboratory analyses to be performed. The sampling plan is designed to target the specific environmental concerns identified in the Phase 1.

Soil Sampling and Analysis

Soil samples are collected using hand augers, direct-push technology (such as Geoprobe), or hollow-stem auger drill rigs. Samples are collected at various depths depending on the suspected contamination. The samples are placed in laboratory-provided containers, preserved as required, and shipped to an accredited laboratory under chain-of-custody protocols.

Groundwater Monitoring and Sampling

If groundwater contamination is a concern, the environmental professional may install temporary or permanent monitoring wells. Groundwater samples are collected after the well has been developed and allowed to stabilize. Samples are analyzed for the same contaminants identified in the Phase 1 findings.

Soil Vapor Testing

Soil vapor sampling tests for volatile organic compounds (VOCs) that may migrate from contaminated soil or groundwater into buildings through foundation cracks. This is particularly relevant for properties near dry cleaners, gas stations, or industrial facilities where solvents or fuels were used.

Laboratory Analysis

All samples are analyzed by accredited laboratories using EPA-approved methods. Results are compared against federal and state screening levels or cleanup standards to determine whether contamination exceeds regulatory thresholds.

Common Contaminants Tested

The specific contaminants tested depend on the Phase 1 findings and the property's history. Common analytes include:

• Volatile Organic Compounds (VOCs). Solvents like tetrachloroethylene (PCE) and trichloroethylene (TCE) from dry cleaning and degreasing operations, and fuel constituents like benzene, toluene, ethylbenzene, and xylenes (BTEX).
• Semi-Volatile Organic Compounds (SVOCs). Polycyclic aromatic hydrocarbons (PAHs) from coal tar, creosote, and petroleum combustion.
• Petroleum hydrocarbons. Total petroleum hydrocarbons (TPH) from fuel storage tanks, spills, and automotive operations.
• Metals. Lead, arsenic, chromium, mercury, and other metals from industrial processes, paint, and smelting operations.
• Pesticides and herbicides. From agricultural operations or landscaping activities.
• PFAS. Per- and polyfluoroalkyl substances from firefighting foam, industrial processes, and manufacturing. PFAS testing has become increasingly common since the ASTM E1527-21 update.

Phase 2 ESA Timeline

A standard Phase 2 ESA takes 4 to 8 weeks from authorization to report delivery. The timeline depends on the scope of sampling and laboratory turnaround times.

• Week 1-2: Sampling plan development, utility clearance, and equipment mobilization.
• Week 2-3: Field work (soil borings, well installation, sample collection).
• Week 3-5: Laboratory analysis (standard turnaround is 10 to 15 business days; rush is available).
• Week 5-8: Data evaluation, report preparation, and senior review.

Rush turnaround is available for an additional fee, typically compressing the timeline to 3 to 4 weeks.

Phase 2 ESA Cost

Phase 2 ESAs typically cost between $5,000 and $30,000+. The price depends on the number of borings, depth of sampling, types of contaminants, laboratory costs, and whether monitoring wells are installed. For a detailed cost breakdown, see our Phase 2 ESA cost guide.

What Happens After a Phase 2

The Phase 2 results fall into one of two categories:

• No contamination above screening levels. The property is cleared. The Phase 2 report confirms that the RECs identified in the Phase 1 did not result in contamination requiring further action.
• Contamination confirmed. If contaminant concentrations exceed regulatory screening levels, further action is needed. This may include additional delineation sampling to define the extent of contamination, a risk assessment, or a Phase 3 remediation plan.

Phase 2 findings significantly affect property value and transaction decisions. Confirmed contamination may lead to price renegotiation, seller remediation requirements, or in some cases, the buyer walking away from the deal.

Phase 1 vs Phase 2

A Phase 1 ESA is a records-based, non-invasive assessment. A Phase 2 involves physical sampling and testing. Not every Phase 1 leads to a Phase 2. A Phase 2 is only needed when the Phase 1 identifies conditions that warrant further investigation. For a complete comparison, see our Phase 1 vs Phase 2 guide.

Who Performs Phase 2 ESAs

Phase 2 ESAs are conducted by licensed environmental professionals, typically professional engineers (PEs) or professional geologists (PGs) with expertise in site investigation. The firm should carry professional liability insurance and have experience with the specific contaminants and property types relevant to your site.

Get Phase 2 ESA Quotes

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