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M CDIM Standard Operating Procedure 4.1 Soil Vapor Sampling Rev.1 6/30/2022 2.4 Tracer Gas In the context of this SOP, a tracer gas is used to detect leaks in the sampling system. Helium is an inert gas commonly used as a tracer for leak detection due to its non-flammable, non-toxic properties and its trace presence in the atmosphere. 3 PROCEDURE This section describes the procedures implemented to ensure quality of subsurface vapor samples. The details within this SOP should be used in conjunction with project work plans. This SOP was prepared in general accordance with the California Department of Toxic Substances Control (DTSC)Advisory Active Soil Gas Investigations dated July 2015. The project work plans will generally provide the following information: 1. Sample collection objectives; 2. Subsurface vapor sample locations; 3. Number of subsurface vapor samples and their volume; 4. Analyses to be conducted for each sample; 5. Specific quality control (QC) procedures and sampling required; and 6. Any additional sampling requirements or procedures beyond those covered in this SOP, as necessary. There are many different methods that may be used for subsurface vapor sample collection. This SOP focuses on employment of the Vapor PinTm and single or nested vapor well approaches. If other subsurface soil sampling methods are deemed necessary to meet project objectives, the procedures for these methods will be updated in this SOP or included in the project work plans. The following subsections outline procedures for subsurface soil sampling. 3.1 Responsibilities The project manager is responsible for ensuring that all sample collection activities are conducted in accordance with this SOP and any other relevant procedures included in project work plans and/or quality assurance project plans (QAPP). The project manager is therefore also responsible for ensuring that the staff working on the project is properly trained in this SOP and other relevant procedures to ensure quality assurance/quality control (QA/QC). The project manager may also choose to take on the role and responsibilities of the project QA manager(see below), when appropriate. A project QA manager, designated by the project manager is responsible for periodic review of field generated documentation associated with this SOP. The QA manager is also responsible for implementing corrective actions (i.e., retraining personnel, additional review of work plans and SOPs, variances to QC sampling requirements, issuing field variances, etc.) to address deficiencies before problems may occur. The project manager will designate a field coordinator who is responsible for all field activities, including preparations and demobilization. The field coordinator oversees all field personnel to ensure that sampling is being conducted in accordance with the relevant SOPs and project plans. Field personnel assigned to conduct subsurface vapor sampling activities are 2