Due Diligence

Due Diligence Services

The scope of transactional due diligence continues to expand and change, and Calex Environmental tracks these changes via American Standards and Testing Materials (ASTM) Standards E1527, E1528 and E1903 to provide standard-of-care information to the parties of commercial and industrial real estate transactions. ESAs satisfy one of the qualifications (“All Appropriate Inquiry”) for the innocent landowner, contiguous property owner, or bona fide prospective purchaser limitations on Superfund liability.

View or print our Due Diligence Services Sheet (PDF)


  • Responsiveness
  • Proactive Communication
  • Focus on Business Environmental Risk
  • Quantification of RECs

Transaction Screens
ASTM E 1528

The purpose of this practice is to define good commercial and customary practice for conducting a transaction screen for a parcel of commercial real estate where the user wishes to conduct limited environmental due diligence (less than a Phase I ESA).

Phase I ESAs
ASTM E 1527
The purpose of this practice is to define good commercial and customary practice for conducting an ESA of a parcel of commercial real estate with respect to the range of contaminants within the scope of Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) (42 U.S.C. 9601) and petroleum products.

Phase II ESAs
ASTM E 1903

This practice is intended for use on a voluntary basis by parties who wish to evaluate known releases or likely release areas identified by the user or Phase II Assessor, and/or to assess the presence or likely presence of substances, for legal or business reasons.

Vapor Intrusion
ASTM E2600

The purpose of this practice is for conducting a vapor encroachment screen (VES) on a property parcel involved in a real estate transaction with respect to Chemicals of Concern (COC) that may migrate as vapors onto a property as a result of contamination.

Calex ASTM E1527 —- Non-Scope Services

Asbestos Containing Materials

Radon in Air, Water, Soil

Lead Based Paint


Drinking Water Quality

Indoor Air Quality

Mold and Biological Agents

Industrial Hygiene Health & Safety

Regulatory Compliance

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