Phase I Environmental Site Assessments

Home » Services & Solutions » Phase 1 Environmental Site Assessment

Phase I  ESA

A critical step in environmental due diligence for real estate is the Phase I Environmental Site Assessment commonly rerfered to as a Phase I ESA or simply a Phase I. The purpose of a Phase I is to provide a preliminary assessment of a property's potential environmental liabilities for a site owner or prospective buyer.  A Phase I is completed prior to closure and can be used to obtain protection from potential liability under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) as an innocent landowner, a contiguous property owner, or  prospective purchaser. The guielines for a Phase I are provided in ASTM Standard E1527-13.

Phase I assessments typically do not involve sampling of groundwater, soil or other environmental materials. Such efforts may be reserved for a more detailed Phase II if the potential for impact has been identified.

When to Consider a Phase I

Several reasons for requiring a Phase I include:

  • Property aquisition or divestiture
  • Offering a loan against the property
  • Redistribution of ownership

What is Included

A Phase I typically involves a site walk through, careful review of existing site environmental documents, a review of various databases, interviews and a review of existing State environmental agency files.  An evaluation is then made of current and historical site environmental conditions in addition to an evaluation of risks from nearby and adjoining properties.

Tasks performed in an ASTM 1527-13 Phase I typically include:

  • Conduct an on-site visit to view present site conditions and document potential environmental issues.
  • Evaluation of potential risks to the subject property from adjoining and nearby properties
  • Review of Federal, State, Local and Tribal databases to specified distances.
  • Review historical aerial photography of the vicinity to identify historic land uses and changes.
  • Review historical topographic maps which include the property to identify changes to topography, drainage patterns and development
  • Review of historical fire insurance maps
  • Examine chain-of-title for Environmental Liens and/or Activity and Land Use Limitations (AULs).
  • Interview individuals familiar with the property history (past owners, present owner, key site manager, etc).
  • Contact with public agencies (fire department, county health department, etc.) with knowledge of site history and potential environmental issues.
  • Conduct a review of existing files at the State environmental agency.

Contact GSI Environmental Services for a Phase I Assessment

A Phase I Assessment must be prepared by a qualified individual, typically an environmental scientist with a professional geologist or environmental engineer’s license. GSI has been providing quality Phase I ESAs for over 20 years compiled by experienced and knowledgeable professionals. If you need a Phase I or other environmental services, contact GSI today.


What Our Customers Have to Say

"Groundwater Services, Inc. has been our “go-to” team for Phase I work for all of our real estate development projects. Having a firm like them that understands the importance of high pressure deadlines and complex grant requirements has been invaluable. Their communication, competence, and timeliness have been outstanding every time. We couldn’t be happier with their services."

David Butcher , President & Partner WCI Partners, LP