SUBSURFACE INVESTIGATIONS - PHASE II ESAs

Subsurface investigations, in some situations referred to as Phase II Environmental Site Assessments (Phase II ESAs), are recommended when environmental conditions are identified or assumed to exist, either associated with the subject site or the adjacent properties.  

The Phase II ESAs are conducted in order to characterize the subsurface conditions, to identify potential contaminants and their capability to adversely affect human and/or ecological receptors, to determine the necessity for active remediation, and if applicable, to obtain closure from the Oregon Department Of Environmental Quality (DEQ).

The Phase II ESAs involve the assessment, sampling, and analyses of subsurface media, e.g. soil, groundwater, and/or soil gas.  Vortex GEC collects the samples and submits them to project-specific accredited labs for a wide range of analyses. 

The drilling methods most often used include push-probe, hollow stem auger, and hand auger.  Vortex GEC subcontracts Oregon licensed drillers to complete the subsurface investigations.

Vortex GEC collects any media samples and submits them to project specific accredited labs. 

A Ground Penetrating Radar (GPR) survey is often conducted prior to a Phase II ESA to identify potential buried underground storage tanks or disturbed soil, e.g. a former UST excavation. 

Vortex GEC plans and conducts subsurface investigations, communicates with DEQ project managers, oversees subcontracted personnel, and prepares comprehensive reports.

​For more information please contact us at info@vortexgec.com