Soil Gas Sampling: A Practical Perspective - …

Soil gas sampling : A Practical Perspective Theo Johnson Geological Services Unit Department of Toxic Substances Control September 25, 2012 DOCUMENT OVERVIEW Combines 2003 Advisory and 1997 LARWQCB 1997 interim guidance for Active Soil Gas Investigations into one comprehensive document Incorporates over 450 comments from consultants WHY SOIL GAS? Measure the extent of vapor phase contaminants Use in combination with conventional sampling to delineate VOC contamination Soil matrix type (gravel, sand, silt, clay) Reduces volatilization and biodegradation potential Real time decisions Time and cost 2012 Advisory Expanded workplan section Addition of Site Conceptual Model (CSM) Purpose of CSM Basic components in a CSM Elements of the Workplan Report section Assess and revise CSM Identify data gaps based on revised CSM 2012 Advisory Provides investigation flexibility using Data Quality Objectives (DQOs) instead of prescriptive language. Sample spacing Sample depths Detection limits Analytical methods 2012 Advisory Initial sampling at 2 depths based on DQOs, CSM and LITHOLOGY!

DOCUMENT OVERVIEW •Combines 2003 Advisory and 1997 LARWQCB 1997 Interim Guidance for Active Soil Gas Investigations into one comprehensive document •Incorporates over 450 comments from

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  Perspective, Practical, Guidance, Interim, Sampling, A practical perspective, Gas sampling, Interim guidance

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