---
title: What is a Phase II?
description: At the most basic level, a Phase II Limited Subsurface Investigation is an environmental site investigation that collects physical samples and subjects them to laboratory analysis specific to chemical
---

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# What is a Phase II?

At the most basic level, a Phase II Limited Subsurface Investigation is an environmental site investigation that collects physical samples and subjects them to laboratory analysis specific to chemicals of concern (COCs) identified in the initial environmental site assessment. This data collection and analysis determines whether contaminants are present on site in sufficient concentration to pose a risk to human health or the environment.

Our [Phase I Environmental Site Assessment](https://cretelligent.com/phase-i-environmental-site-assessment/) (ESA or [ETS](https://cretelligent.com/environmental-transaction-screen/)) provides sufficient information for a qualified Environmental Professional (EP) to determine whether a Potential Environmental Concern (PEC) or a Recognized Environmental Condition (REC) exists on a property. Such environmental concerns are defined under ASTM Standard Guidance E1528-14 and or E1527-13 as “the presence or likely presence of any hazardous substances or petroleum products in, on, or at a property.” The detection of these conditions can lead an EP to recommend a Phase II investigation for further assessment.

[Phase II](https://www.cretelligent.com/phase-ii-limited-subsurface-investigation/)

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