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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 htto://www.epa.aov/eoawastethazard/testmethods/sw846/Ddfs/methstaLodf 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,alder revisions of methods may be used for historical or consistency 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 parries 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 DESCRIPTION REVISIONS(DATE) COMMENTS METHOD The analytical methods mentioned in this appendix are those commonly used for soil '9' 1986) Remsbn'o'Is the[.fast 9 as testing. Readers of this Advisor should not be limited b the methods discussed in 'away lvsz) revision m spm a me[Wer date 9 Y Y Non-leganated Organla by Gas karevkion-C'. ReWsbn C' eo15 •e'(Decembx 19%) this appendix or elsewhere in this document. Other methods can also be modified For o,rnma�ogmpby was-de debt. bW 2vovasa PP C'(Jane2at03) Wall 2007. ba teat rnelizetl soil gas testing, especially the ambient air methods(EPA TO compendium series). o'(Jane zoovl anal z%r. Whatever methods are being employed for soil gas testing,they should be validated Somatic and Halegenatod vola8las by 40 before q-Day1%z) Replaced methods 0010 b field use. Validation involves demonstrating that the method is applicable and 0011 bas CrvomataJaphy Using PboloWnleellon and/or Ele,"agalt, A(SeplClnber t994) aoz9 appropriate for the analysis of the target analytes at the desired data quality objectives Co"dacav9 Doleeters •a'(December 19%) (detection levels,precision,accuracy,etc.). volatile all Compouodaby Gas -o'omy T%2) 0260 CbmmalugraphyWass Spectrometry .x.(doacearber embW 199Q (GUMS) 'C'(AMU2019%) F-2 HISTORICAL AND LATEST VERSIONS OF ANALYTICAL METHODS 'c'(AMU LEdpon-W erab z PoycycW Pmnatk Hydmrerboirs ryRHs) 1Flyst989 EWtbn'(TO 13)(MWCM1 •hempendlum a,of Toacra Multiple versions of USEPA methods exist and are still in use. Letter suffixes to a TO-tan In RmNemra USNq Gas (969) Or auto mloauon prTAMI CM1mmamgrepM1ylMass Speurametry 'SaealM 1999)' Orga WCompwMMAmbknt method such as"A","B",etc.are used to identify the revision status of the method. The (GUMS) panuary level nr.m.l me revlamama first version of a method(revision"0"[zero])does not have a letter suffix. m°91°d 12/10/2009 -69- 12/1012009 -70-