Phase I Environmental Site Assessments


Environmental Due Diligence

OGI Environmental (OGI) specializes in Environmental Due Diligence and OGI personnel have performed well over 15,000 due diligence reports in Clark County, Nevada and have successfully conducted environmental due diligence services nationwide for thousands of properties. Our most requested due diligence report is a Phase I Environmental Site Assessment (ESA), which is performed in accordance with the ASTM E 1527-13 for conducting environmental site assessments (Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process). The purpose of a Phase I ESA is to accumulate non-intrusive data to be used in evaluating the level of environmental risk associated with a given site and in identifying Recognized Environmental Conditions or RECs. 

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Phase I ESA Summary

A Phase I Environmental Site Assessment consists primarily of the following components:

  • An on-site reconnaissance of the property, including a cursory observation of adjacent properties;
  • Interviews with owners/occupants and local government officials to obtain information indicating recognized environmental conditions in connection with the property;
  • A review of various records to help identify recognized environmental conditions in connection with the subject property and nearby properties; and
  • Preparation of a final report which details the assessment findings and includes supporting documentation.
Most local due diligence reports done locally can be completed within two weeks.

For properties with a perceived lower environmental risk, OGI is also requested to perform ASTM Transaction Screens in accordance with ASTM E 1528-14 (Standard Practice for Limited Environmental Due Diligence: Transaction Screen Process). The transaction screens generally include the same components as a Phase I ESA, but do not include the same level of detail in all areas as a Phase I ESA.

Most local due diligence reports can be completed within two weeks and the work is facilitated by OGI’s in-house research library containing complete and current databases, historical fire insurance maps, current and historical aerial photography and topographic maps, and geologic and soils reference materials. All due diligence reports are performed and/or reviewed by a Principal of the firm who is both an Environmental Professional (as defined by ASTM E 1527-13) and a Nevada Certified Environmental Manager (CEM).

Although not generally part of a Phase I ESA, there are additional non-scope issues that may be requested and addressed if applicable. These include: asbestos, radon, lead-based paint, lead in drinking water, wetlands, regulatory compliance, cultural and historic resources, industrial hygiene, health and safety, ecological resources, endangered species, indoor air quality, biological agents and mold.

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