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APPENDIX F While most revisions of a method can be used,there are some revisions or methods are declared"obsolete"by the USEPA. Laboratories should not use any revisions or SOIL GAS ANALYTICAL METHOD REVIEW methods that are considered"obsolete". For the current status of USEPA methods, refer to the"Status Tables for SW-846,Third Edition"via the link: F-1 SOIL GAS ANALYSIS METHODS http://www.epa,uovlepawaste/hazard/testmethods/sw846/pdfs/meth tat pdf There are no approved U.S.Environmental Protection Agency(USEPA)methods For the purpose of this Advisory,suffixes will not be used when referencing methods. specifically designed to analyze for Volatile Organic Compounds(VOCs)and Semi- Volatile Organic Compounds(SVOCs)in soil gas samples. Consequently,modified Method revisions are published for a number of reasons. The addition of more versions of existing EPA methods are used to analyze soil gas samples. analytes,updating instrumentation,and clarifications of requirements/recommendations are some of the reasons. Most revisions do not involve substantial changes to There are two basic classes of methods being employed in California for soil gas methods. Laboratories are advised to use the latest revisions of the methods. In analysis: 1)Gas Chromatography(GC)with single specific detectors such as Flame certain cases,older revisions of methods may be used for historical orconsistency Ionization Detector(FID), Electron Capture Detector(ECD),Photoionization Detector reasons. Nevertheless,the parties involved in a project should review the particular (PID)or a series of these detectors and 2)Gas Chromatography with Mass revision of a method and confirm that the method version will serve the intended Spectrometer(GC/MS). The GC/MS technique is preferred because of its ability to purpose. If laboratories wish to use a new revision of a method,they should carefully confirm the identification of compounds. review and compare their existing method with the new revision to verify that there are no significant changes that can affect data quality and/or the data quality objectives of The modifications made to accommodate soil gas sample include the sample their clients. introduction technique and the calibration standards. With the number of variations of sample introduction and calibration techniques available,it is important for consultants, Laboratories should clearly indicate the exact revision of the method used in their regulators and other stakeholders to evaluate the technique(s)being employed before laboratory reports to their clients. work begins on a site. All of the modifications have both advantages and disadvantages with some working better for certain compounds than others. Project Table F-1 delineates the various versions of USEPA methods referenced in this Data Quality Objectives(DQOs)should be the deciding factor on which technique is the advisory modified for soil gas testing: best to use for each phase of work on a particular site. If possible,the parties involved should perform preliminary performance tests(i.e.,trial runs)using a selected number Table F-1: USEPA Soil Gas Testing Methods of techniques and determine the best method to use on the site. EPA METHOD DESCRIPTION REVISIONS(DATE) COMMENTS The analytical methods mentioned in this appendix are those commonly used for soil "0"(September 1986) Revislon"D"Is the latest gas testing. Readers of this Advisory should not be limited by the methods discussed in "A"(buy 1992) revision In spite of the later date 8015 ChromN-haatogratedphy Organics by Gas -B-(December 1996) for revislon"C". Revision"C" this appendix or elsewhere in this document. Other methods can also be modified for Chromatography,- C"(February 2007) was Introduced In 2000 as soil gas testing,especially the ambient air methods(EPA TO compendium series). D (June zoo3) draft'update but not finalized Whatever methods are being employed for soil gas testing,they should be validated Aromatic and Halogenated Volatiles by until 2007. Gas Chromatography •U-(July 1992) before field use. Validation involves demonstrating that the method is applicable and 8021 Using •A"(September 1994) Replaced methods 8010 B appropriate For the analysis of the target analytes at the desired data quality objectives Photoionization andfor Electrolytic -B-(December 1996) 8020conddcwn Detectors(detection levels,precision,accuracy,etc.). VJuly 1992) olatile Organic Compounds by Gas -A"A"((September 1994) emb 8260 Chromatography/Mass Spectrometry 6) F-2 HISTORICAL AND LATEST VERSIONS OF ANALYTICAL METHODS (ccfMs) C(Dteic�s12006) "...Edition'refers to the Polycyclic Aromatic Hydrocarbons(PAHs) "First Edition"(TO-13)(March *Compendium of Methods for Multiple versions of USEPA methods exist and are still in use. Letter suffixes to a TO-13A In Ambient Air Using Gas 1989) the Determination of Toxic Chromatography/Mass Spectrometry "Second Edition' Organic Compound In Ambient method such as"A","B",etc.are used to identify the revision status of the method. The (GC/MS) (January 1999) Air"and not the revision of the first version of a method(revision"0"[zero])does not have a letter suffix. I method. 12/10/2009 -69- 12/10/2009 -70-