LSASDPROC-307-R4 Soil Gas Sampling Effective Date: February 7, 2020 Region 4 U.S. Environmental Protection Agency Laboratory Services and Applied Science Division Athens, Georgia Operating Procedure Title: Soil Gas Sampling ID: LSASDPROC-307-R4 Issuing Authority: LSASD Field Branch Chief Effective Date: February 7, 2020 Review Date: February 7, 2024 Purpose This document describes general and specific procedures, methods and considerations to be used and observed when collecting soil gas samples for field screening or laboratory analysis. Scope/Application The procedures contained in this document are to be used by field personnel when collecting and handling soil gas samples in the field. On the occasion that LSASD field personnel determine that any of the procedures described in this section are inappropriate, inadequate or impractical and that another procedure must be used to obtain a soil gas sample, the variant procedure will be documented in the field log book, along with a description of the circumstances requiring its use. Mention of trade names or commercial products does not constitute endorsement or recommendation for use. Page 1 of 16 Uncontrolled When Printed LSASDPROC-307-R4 Soil Gas Sampling Effective Date: February 7, 2020 TABLE OF CONTENTS 1 General Information ...................................................................................................................3 1.1 Documentation/Verification ................................................................................................3 1.2 General Precautions .............................................................................................................3 2 Special Sampling Considerations ..............................................................................................4 2.1 Special Considerations .........................................................................................................4 2.2 Special Precautions for Soil Gas Sampling .........................................................................4 2.3 Sample Handling, Preservation and Transport ....................................................................5 2.4 Quality Control ....................................................................................................................5 2.5 Records ................................................................................................................................5 3 Geoprobe® PRT System Installation .........................................................................................5 3.1 General .................................................................................................................................6 3.2 PRT System Installation Procedures ....................................................................................6 3.3 Decommissioning PRT Sample Locations ..........................................................................8 4 Geoprobe® Permanent Soil Gas Implant Installation ...............................................................8 4.1 General .................................................................................................................................8 4.2 Installation of Permanent Soil Gas Sampling Implants .......................................................8 5 Sub-Slab Soil Gas Sampling Port Installations ........................................................................11 5.1 General ...............................................................................................................................11 5.2 Installation of Temporary Sub-slab Soil Gas Sampling Ports ...........................................11 5.3 Installation of Permanent Sub-slab Soil Gas Sampling Ports ............................................11 6 Helium Leak Testing of PRT Soil Gas Sampling Installations ...............................................12 6.1 General ...............................................................................................................................12 6.2 Helium Leak Testing Procedures for PRT Soil Gas Sampling Installations .....................12 6.3 Helium Leak Testing Procedures for Sub-slab Soil Gas Sample Ports .............................13 7 Sampling Soil Gas Installations ..............................................................................................13 8 References ................................................................................................................................14 9 Revision History ......................................................................................................................16 Page 2 of 16 Uncontrolled When Printed LSASDPROC-307-R4 Soil Gas Sampling Effective Date: February 7, 2020 1 General Information 1.1 Documentation/Verification This procedure was prepared by persons deemed technically competent by LSASD management, based on their knowledge, skills and abilities and has been tested in practice and reviewed in print by a subject matter expert. The official copy of this procedure resides on the LSASD Local Area Network (LAN). The Document Control Coordinator (DCC) is responsible for ensuring the most recent version of the procedure is placed on LAN and for maintaining records of review conducted prior to its issuance. 1.2 General Precautions 1.2.1 Safety Proper safety precautions must be observed when collecting soil gas samples. Refer to the LSASD Safety, Health and Environmental Management Program (SHEMP) Procedures and Policy Manual and any pertinent site-specific Health and Safety Plans (HASP) for guidelines on safety precautions. These guidelines should be used to complement the judgment of an experienced professional. Address chemicals that pose specific toxicity or safety concerns and follow any other relevant requirements, as appropriate. 1.2.2 Procedural Precautions The following precautions should be considered when collecting soil gas samples. 1.2.2.1 Special care must be taken not to contaminate samples. This includes storing samples in a secure location to preclude conditions which could alter the properties of the sample. 1.2.2.2 Samples shall be custody sealed during long-term storage or shipment. 1.2.2.3 Custody seals should not be placed on the canisters due to VOCs that may out-gas from the adhesives. Custody seals should be placed on the outside of canister shipping containers. 1.2.2.4 Sample identification tags shall be attached to the canister using wire, cable tie, or string. Adhesive labels should be affixed to the tag and not be placed directly on the canister. 1.2.2.5 Collected samples are in the custody of the sampler or sample custodian until the samples are relinquished to another party. 1.2.2.6 If samples are transported by the sampler, they will remain under his/her custody or be secured until they are relinquished. 1.2.2.7 Shipped samples shall conform to all U.S. Department of Page 3 of 16 Uncontrolled When Printed LSASDPROC-307-R4 Soil Gas Sampling Effective Date: February 7, 2020 Transportation (DOT) and/or International Air Transportation Association (IATA) hazardous materials shipping requirements. 1.2.2.8 Documentation of field sampling is done in a bound logbook. 1.2.2.9 Chain-of-custody (COC) documents shall be filled out and remain with the samples until custody is relinquished. 1.2.2.10 Canister Sample Identification Tags and COC and Field Logbook should list the unique canister serial number and the starting time that the sample was collected. 1.2.2.11All shipping documents, such as air bills, bills of lading etc., shall be retained by the project leader and stored in a secure place. 2.0 Special Sampling Considerations 2.1 Special Considerations for Sampling The tubing used as part of either of the described sampling systems should be Teflon® or stainless steel. As most current soil gas sampling will be conducted to investigate the presence or extent of organic compounds (not including PFAS compounds), Teflon® tubing is required to ensure the integrity of the sample. Extreme care should be taken to protect all VOC sampling equipment whose surfaces will come in direct contact with the collection of the sample. For instance, a Geoprobe® or other drilling rig should not be used to carry or transport sampling equipment because of diesel and other VOC emissions. In addition, other field support vehicles should not be operated in the proximity of the sampling site shortly before or during sampling. 2.2 Special Precautions for Soil Gas Sampling 2.2.1 A clean pair of new, non-powdered, disposable gloves (gloves) will be worn each time a different location is sampled, and the gloves should be donned immediately prior to sampling. The gloves should be changed any time during sample collection when their cleanliness is compromised. 2.2.2 If possible, one member of the field sampling team should take all the notes and photographs fill out tags, etc., while the other member(s) collect the samples. 2.2.3 Using O-rings on all PRT tooling, adapters, and probe rods will ensure that the entire sampling train is air-tight. This will prevent soil ingress during installation and to maintain sample integrity by ensuring that no ambient air is introduced into the sample during collection. Page 4 of 16 Uncontrolled When Printed LSASDPROC-307-R4 Soil Gas Sampling Effective Date: February 7, 2020 2.3 Sample Handling Requirements 2.3.1 Soil gas samples will typically be collected by directly filling an evacuated, 6-liter passivated stainless-steel canister after