Vapor Intrusion Assessment and Monitoring

Volatile chemicals in soil or groundwater sometimes migrate into buildings, resulting in a Vapor Intrusion Condition. Even at low concentrations, the presence of some volatile compounds may pose a health concern to building occupants. Therefore, G|E|M performs a risk assessment for vapor concerns with every Phase I Environmental Site Assessment. When potential concerns are identified, G|E|M will design accurate, cost-effective monitoring solutions to obtain reliable results for evaluation.


  • Indoor air testing
  • Groundwater testing
  • Sub-slab and soil vapor testing
  • Pathway and plume evaluation
  • Site assessments and modeling
  • Source identification
  • Risk assessment
  • Building mitigation
  • Regulatory liaison
Diagram showing affect of ground born contaminants on indoor air quality
“G|E|M’s professional and knowledgeable staff is always available to assist us with any environmental concerns or issues. We, without exception, assured that our projects are handled by qualified professionals, and for that reason, I highly recommend G|E|M to customers and business associates.”  
                                                                               – David Alpem, SVP, Fremont