Phase II Environmental Site Assessment (ESA)

Protecting Your Investment with Expert Phase II ESAs from Essel Environmental

When buying, selling, or financing property in California, environmental risk is a significant concern. You've completed the critical first step—a Phase I Environmental Site Assessment (ESA). If that Phase I ESA, expertly reviewed by Essel's team, identified Recognized Environmental Conditions (RECs), the logical and necessary next step is a Phase II Environmental Site Assessment (ESA).

At Essel Environmental, we specialize in providing comprehensive, scientifically sound Phase II ESAs across California, giving you the definitive data you need to make informed decisions and manage your financial risk.

What is a Phase II Environmental Site Assessment?

A Phase II ESA is the investigative stage of environmental due diligence. Unlike the Phase I ESA, which is a non-intrusive historical and site-use review, the Phase II ESA conducted by Essel is an intrusive physical investigation designed to confirm or deny the presence of contamination identified as a potential risk during the Phase I process.

In simple terms, if the Phase I ESA says, "There might be a problem here," the Phase II ESA answers the question, "Is there actually a problem, and if so, how bad is it?"

This Assessment is Crucial For:

Confirming contamination

Before a transaction closes

Defining scope and cost

Of potential cleanup

Satisfying lender requirements

When RECs are present

Protecting yourself

From future liability under state and federal environmental laws

What's Included in a Phase II ESA by Essel

The scope of a Phase II ESA is customized for every property, depending on the specific RECs identified in the Phase I report. However, every Essel Phase II investigation is executed with precision, adhering to ASTM E1903 standards and all relevant California state and local regulations.

01

Site Planning and Utility Clearance

Work Plan Development

Developing a site-specific work plan based on the RECs

Permit Acquisition

Obtaining necessary permits (where applicable)

Utility Clearance

Thorough utility clearance (e.g., calling 811 and potentially private utility locators) to ensure safe drilling and sampling

02

Subsurface Investigations (Drilling and Sampling)

This is the core of the Phase II, involving the collection of physical samples from the site:

Soil Sampling

Collecting soil cores at strategic locations (often near historical underground storage tanks, dry cleaner operations, or known spill areas) to test for contaminants

Groundwater Sampling

Installation of temporary or permanent monitoring wells to obtain accurate groundwater samples. This is vital in California where groundwater protection is a priority

Soil Vapor Sampling

Collecting samples of the vapor in the soil (soil gas) to test for the presence of Volatile Organic Compounds (VOCs) that can migrate and pose an indoor air quality risk (vapor intrusion)

03

Analytical Laboratory Testing

All samples are sent to an accredited, certified environmental laboratory for analysis. The laboratory tests specifically target the contaminants associated with the RECs, which may include:

Petroleum Hydrocarbons (TPH-G/D/O)

From leaky USTs or vehicle maintenance areas

VOCs & SVOCs

Common near former dry cleaners (TCE, PCE) or industrial operations

Heavy Metals

From historical fill or manufacturing processes (e.g., lead, arsenic)

Pesticides/Herbicides

Relevant on former agricultural properties

PCBs and Asbestos

Often tested in building materials. Essel utilizes specialized equipment for precise vapor assessments

04

Data Interpretation and Comprehensive Reporting

Essel's expert geologists and environmental scientists analyze the laboratory results, comparing them against applicable regulatory screening levels (e.g., California Human Health Screening Levels - CHHSLs, Regional Water Quality Control Board guidelines).

The final Phase II ESA report from Essel Environmental provides a clear, concise interpretation of the findings, including:

Field Activity Description

A description of the field activities

Technical Diagrams

Boring logs and well construction diagrams

Sampling Maps

Maps showing all sampling locations

Laboratory Data

Laboratory data sheets (chain-of-custody)

Professional Conclusion

A professional conclusion on whether contamination exists above regulatory limits

Critical Recommendation

If contamination is found, Essel provides practical recommendations for the next steps, which may include further delineation or remediation (Phase III).

Choose Essel Environmental for Your California Phase II ESA

Navigating the complexities of environmental regulations in California requires local knowledge and proven expertise. Essel Environmental stands out as the premier choice because:

California Focus

We have extensive experience dealing with the specific regulatory agencies, geology, and environmental challenges unique to the California area.

Expert Team

Our field teams are certified and experienced drillers, geologists, and environmental engineers who prioritize safety and data integrity.

Clarity and Trust

We translate complex scientific data into clear, actionable advice, allowing you to proceed with confidence.

$8,000 - $15,000

For standard California commercial properties

3 to 5 Weeks

Standard completion timeline

Timeline Breakdown:

1 week - Site Planning 2-3 days - Field Work 1 week - Lab Analysis 1 week - Report Writing

Complex sites requiring deep groundwater monitoring wells or extensive soil vapor probes can exceed $30,000. Essel provides transparent, line-item budgeting to ensure no surprise costs during the investigation.

Don't let environmental uncertainty jeopardize your real estate deal.

Contact Essel today to schedule your essential Phase II Environmental Site Assessment. Soil Characterization [Importance of Soil Testing] Phase I ESA to Phase 2 Investigation - We Go Live!

Frequently Asked Questions: Phase II Environmental Site Assessments (ESA)

A Phase II ESA is initiated when a Phase I ESA identifies Recognized Environmental Conditions (RECs). In California, common triggers include historical use as a dry cleaner, gas station, or industrial facility, as well as proximity to known contaminated "Superfund" sites or leaking underground storage tanks (LUST).

For standard California commercial properties, a Phase II ESA typically ranges from $8,000 to $15,000. However, complex sites requiring deep groundwater monitoring wells or extensive soil vapor probes can exceed $30,000. Essel provides transparent, line-item budgeting to ensure no surprise costs during the investigation.

The standard timeline is 3 to 5 weeks. This includes 1 week for site planning and utility clearance (811 marking), 2–3 days for field drilling and sampling, 1 week for accredited laboratory analysis, and 1 week for the final data interpretation and report writing by our geologists.

A Phase I ESA is a non-intrusive research-based report (historical records and walkthrough). A Phase II ESA is an intrusive investigation that involves physical sampling of soil, water, or vapor to confirm if the "potential" risks found in Phase I are actually present.

Yes. To get accurate subsurface data, Essel's technicians use specialized drilling rigs (such as Direct Push or Hollow Stem Auger) to collect soil cores and install monitoring wells. We prioritize "Low-Impact" drilling to minimize disruption to active business operations.

We test for specific chemicals associated with your property's history. Common analytes include Petroleum Hydrocarbons (TPH), Volatile Organic Compounds (VOCs) like PCE and TCE from dry cleaning, Heavy Metals (Lead/Arsenic), and Polychlorinated Biphenyls (PCBs).

Vapor intrusion occurs when hazardous chemicals in soil gas migrate upward into a building's indoor air. California regulators (DTSC and Water Boards) are extremely strict regarding vapor risks.

All Essel Phase II investigations adhere to the ASTM E1903 standard. Furthermore, we compare findings against California-specific thresholds, including Environmental Screening Levels (ESLs).

If contaminants exceed regulatory limits, Essel provides a clear roadmap for the next steps. This may include a Phase III ESA (Remediation Plan) to clean up the site or "Institutional Controls" (like land-use restrictions) to manage the risk without full excavation.

In California, certain "significant" releases of hazardous materials must be reported to agencies like the Regional Water Quality Control Board or DTSC. Essel's consultants guide you through these legal obligations to ensure you remain in compliance while protecting your interests.

While possible, it is not recommended. A Phase I ESA provides the legal "All Appropriate Inquiries" (AAI) protection required for CERCLA liability defense. Skipping it may leave you legally vulnerable even if the Phase II comes back clean.

California has some of the most protected groundwater in the US. Even minor soil contamination can be a major liability if it reaches the water table. Essel's geologists specialize in hydrogeology to accurately assess how contaminants move through California's unique soil layers.

Absolutely. Essel only partners with ELAP-certified (Environmental Laboratory Accreditation Program) labs. This ensures that the data used in your report is legally defensible and accepted by lenders and California regulators.

The client who commissions the report owns the data. Essel maintains strict confidentiality, ensuring that your environmental data is only shared with authorized parties involved in your transaction.

National firms often miss local California nuances like specific BAAQMD air requirements or local Water Board "hot zones." Essel combines national-standard reporting with "boots-on-the-ground" California expertise, ensuring your deal closes faster and with less risk.