Phase II - Preliminary Contamination Assessments A Phase II Environmental Site Assessment (Phase II ESA) is an investigation of soil, groundwater, surface water, sediments, and occasionally bedrock or indoor air. The purpose of a Phase II ESA is to evaluate potential source areas of contamination, determine the extent of potential contaminant migration from the source areas, and determine if sensitive receptors are impacted.
SRP Environmental has performed a variety of Phase II ESAs for private companies and state and federal agencies. We have investigated a wide variety of sites where many types of industries have operated.
A Phase II ESA completed by SRP usually involves one or more of the following approaches to delineation:
Soil
• Soil boring installation and sample collection using hollow stem auger, geoprobe, direct-push techniques
• Test pitting using an excavator
• Soil vapor survey
Water
• Groundwater sample collection from monitoring wells using low flow and standard purge volume sampling techniques
• Groundwater sample collection from temporary wells using low flow pumps and/or bailers
• Groundwater sample collection from temporary wells with pre-packed screens
The approach selected for each investigation varies according to the site geology, location of potential contaminants, and the media potentially impacted. Once the investigative techniques are selected, samples are collected from the media and analyzed for particular constituents of concern. Geologists are then tasked to interpret the sample data and create a conceptual model and assess actual or potential impacts to receptors.
| 
