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Useful Links 
California DTSC/HERD Johnson and Ettinger Models 
SWRCB DRAFT Low-Threat UST Closure Policy, July 14, 2011
American Petroleum Institute Vapor Intrusion Guidance
Interstate Technology & Regulatory Council VI Guidance 
California DTSC CalTOX Model 
Use of California Human Health Screening Levels (CHHSLs) in Evaluation of Contaminated Properties 
USEPA Region 9 Regional Screening Levels for Chemical Contaminants
DTSC Final Guidance for Evaluation and Mitigation of Vapor Intrusion, October 2011 
USEPA On-Line Tools For Site Assessment Calculations – Evaluation of Vapor Intrusion into Buildings form Contaminated Groundwater and Soil 
Caltrans Soil and Rock Logging, Classification and Presentation Manual, 2010 Edition
DTSC/LARWQCB Advisary on Active Soil Gas Investigations, January 2003