Serving Environmental needs for over 35 years

Phase I ESAs

Phase I Environmental Site Assessments

What is a Phase I ESA?

A Phase I ESA is an assessment of a property that utilizes regulatory and historical research, interviews, and site inspection to identify environmental conditions at a property. It is a powerful tool for due diligence. The scope of work for a Phase I ESA follows the American Society for Testing and Materials guideline entitled Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process (ASTM E1527-13), and is intended to constitute All Appropriate Inquiry (AAI) for purposes of the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA).

HAI’s Expertise

HAI has conducted over 4,000 Phase I ESAs since 1987. Our clients have included individuals, businesses, lenders, developers, land conservation groups, utilities, and public agencies. Our experienced team of Environmental Professionals has assessed every type of property, ranging from residential properties to large tracts of undeveloped land to commercial and industrial properties. We also specialize in corridor studies, which can be many miles long. Because we are based in the Pacific Northwest, we are familiar with local sources of information that are often overlooked by out-of-town firms.

Representative Projects

Cottonwood Canyon
Nestucca Bay
Portland-Milwaukie Light Rail Corridor
Hillsboro 4th Main Brownfield

As a focused regional firm, we provide a personal approach, along with attention to detail, consistent high-quality work, and continuity of staff and services, including Phase I and II ESAs, Remedial Investigations, and Brownfield Redevelopment. The solutions we provide for our clients are formulated to promote responsible stewardship of the environment.