1. ASTM D5314 – 92 , Standard Guide for Soil Gas Monitoring in the Vadose Zone , ASTM International , West Conshohocken, P.A. , 2006 , http://www.astm.org
2. ASTM D7663 – 11 , Standard Practice for Active Soil Gas Sampling in the Vadose Zone for Vapor Intrusion Evaluations , ASTM International , West Conshohocken, P.A. , 2011 , http://www.astm.org
3. Electric Power Research Institute (EPRI) , Reference Handbook for the Site-Specific Assessment of Subsurface Vapor Intrusion to Indoor Air , EPRI Document #1008492, Palo Alto, CA , March 2005
4. American Petroleum Institute (API) , Collecting and Interpreting Soil Gas Samples from the Vadose Zone: A Practical Strategy for Assessing the Subsurface Vapor-to-Indoor Air Migration Pathway at Petroleum Hydrocarbon Sites , API Publication #4741 , 2005
5. Direct-Push Installation of Devices for Active Soil Gas Sampling and Monitoring , Geoprobe®Technical Bulletin #3099, May 2006, http://geoprobe.com/sites/default/files/pdfs/soil_gas_sampling_and_monitoring_mk3098.pdf