Environmental Site Assessments

What is an Environmental Site Assessment?

Environmental Site Assessments (ESAs) are reports prepared for a real estate holding that identify potential or existing environmental contamination liabilities.

ESAs are typically broken down into Phase I and Phase II rounds of testing. A Phase I Environmental Assessment is known as the first step in environmental due diligence, and involves a review of records, a site inspection, and interviews with owners, occupants, neighbors and local government officials. While sampling and laboratory analysis are not always included in this phase, they should still be conducted by an environmental professional trained in the appropriate standards.

A Phase II Environmental Assessment is conducted if the results from the Phase I ESA suggest contamination may be present. These assessments are more intrusive investigations that collect original samples and analysis to best assess the nature and extent of the contamination concerns.


Phase I Environmental Assessment

Included in a Phase I ESA:

  • A review of historical and current environmental records and documentation pertaining to the site
  • Regulatory records review, including Federal, State, Local and Tribal records concerning the property and the neighboring properties
  • Performance of an on-site visit to view present conditions and evaluate any likely environmentally hazardous site history
  • Evaluation of risks of neighboring properties upon the subject property
  • Interview of persons knowledgeable regarding the property history (past owners, present owner, key site manager, present             tenants, neighbors)
  • Professional report, including conclusions and recommendations concerning the property, based on our professional judgment             and findings.


Phase II Environmental Assessment

Included in a Phase II ESA:

  • Subsurface soil and water samples
  • Surface soil and water samples
  • Groundwater monitoring
  • Building materials
  • Testing of underground storage tanks
  • Transformer/capacitor sampling for Polychlorinated Biphenyls (PCBs)
  • Sampling of dry wells, floor drains, and catch basins
  • Geophysical testing for buried tanks and drums


When to Conduct and Environmental Site Assessment

It is wise to conduct an environmental site assessment when buying or selling a plot of land or structure, when looking to build or change use of a particular space, or if there is reason to believe that environmental contamination has occurred on that land at any point during its use.

Environmental site assessments are important for ensuring human and environmental health, and for preventing further spread or negative impact of contamination.


Contact DS Environmental!

DS Environmental has a team of skilled Industrial Hygienists who can perform Phase I and Phase II Environmental Site Assessments. Thanks to our training and expansive experience, DS Environmental can develop a management plan to best approach any contamination that may be discovered.


Call DS Environmental at (303)286-9094 to learn more about Environmental Site Assessments, and if that service might be right for you!