Vapor intusion issues and concerns are ever evolving as regulations, guidance and technologies change.  Terrax Environmental  is at the cutting edge of vapor intrusion issues. The company continually monitors  changes and advancements in this specialized science through ongoing work  on vapor intrusion sites, in house research and continual education outreach efforts.

Terrax engineers and geologists have worked on a large number of vapor intrusion sites and have experience with a range of volatile organic compounds. Their expertise encompasses initial testing for impacts, evaluation and modeling and assessment  of "fit for purpose" risks to health and the environment, through to remedial  action and cost recovery actions.

Vapor Intrusion Services

·        Source  Identification
·        Soil Vapor Testing
·        Sub Slab Testing
·        Indoor Air Testing
·        Risk Assessment
·        Remedial Cost Estimates
·        Remedial Action Design  
         and Implementation
·        Litigation Support
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California Vapor Intrusion Links:

Screening Levels
California Human Health Screening Levels

San Francisco Bay RWQCB Environmental Screening Levels

California Soil Screening Numbers


Guidance
California Schoolscreen Guidance

San Diego County Site Assessment and Mitigation Program (SAM) Manual
 
California  DTSC Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor
Air

California VI Mitigation Advisory

California  DTSC Soil Gas Investigation Guidance
 
Models
CalTOX Exposure Model
 
San Diego County Vapor Risk 2000  Application

San Diego County Instructions for Vapor Risk 2000

California EPA Toxicity Criteria  Database

California Johnson & Ettinger  Model