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GCIMS Methods GC Methods Soil gas analysis for VOCs should be performed in accordance with the protocols Method/ Modified Modified Modilled Modified Modified COMMENTS Parameter USEPA 8260 USEPA 70- USEPA TO-17 USEPA 8016 USEPA 8021 noted in the respective USEPA method(s)concomitantly with the specific 16 requirements for soil gas samples outlined in Table 1. Parameters not listed validated. should be followed as stated in the original USEPA method. Appendix F of this For a more detailed discussion on the various types of modifications and,other guidance. applications,consult Appendix F. Table 1:Preferred Analytical Methods and Modifications* Mid-level Mid-level Mid-level Mid-level Mid-level calibration calibration calibration calibration calibration standard run standard standard run standard run OC/MS Methods GC Methods Continuing standard run every every 12 every 10 every 12 every 12 ometh method Methodf Modified Modified Modified Modified COMMENTS Calibration Use methhours. sample belch hours. hours. - U ParamUSPA TO eter UMEdified SEPA 8280 16 USEPA TO-17 USEPA 8015 USEPA 8021 acceptance criteria. Use method (Section of Use method Use method acceptance USEPA TOO- acceptance acceptance Most VOCs; Most VOCs Most VOCs; criteria. 1 171 criteria. criteria. Most VOCs: confirmation where confirmation See At minimum, At minimum, confirmation sampling for approximate Limiter) sampling for Appendix F Vapor-phase. vapor-phase Applicab111tylAnalytes sampling for Naphthalene concentrations numberof this of Naphthalene At minimum, No va _ validation validation Validation Naphthalene should should be are VOCs; should be vapor-phase Por check check not needed If be performed by performed by predetermined gasolinefTPH pedonned by discussion.guidance for validation check phase standard at standard m calibration USEPA TO-17. USEPA TO- by another USEPA T0. standard la analyzed Not standard analyzed and analyzed and curve Is 17. method. 17 Calibration Validation validation and evaluated for Applicable. evaluated for evaluated for prepared Samples needed for p each new calibration each new each new with va collected In Samples See curve I%Difference liquid calibration calibration phase passivated pulled through Modified Modified s 2�) standards. curve% Marge-a Appendix F ( curve(% standards. Sample Introduction canisters; sorbent peck: Purge-and- Purge-and- trap Differences Differences Technique Purge-and-bap VOCs are thermal trap(USEPA (USEPA of this (USEPA 5030) 3 guidance . 20%. 20%. concentrated desorbed Into 5030) 5030) discussion. Mld-level Mld-level Mb-level Mid-level on soment GC, calibration callbralion calibration trapco Mid-level calibration standard run calibration standard run standard n standard run for standard run de be for each 20 for each 20 for each 20 End of Run each 20 sample for each 20 determined by See sample belch sample batch sample batch a factors: ion Appendix F Calibration Check batch or et end of sample batch Purge-and- PPe run,whichever is or et end of or at end of or at end of or at end of To determined of lectors: Purge-end- of 1h15 run, run, run, trap:5 to more often. run,whichever Purge-and determined sorbent crap:5l0 250 mL co guidance for whichever Is whichever Is whichever is 9 P y P ( ) more often. Is more often. more open, more often. 5 to 250 mL(cc) b sample selected,tube (Se mL(cc) (See dlscusslon. Sample Size delivery length, (See (See Appendix F for Appendix F Recovery technique and humidity, Appendix F Dilution may discussion) for acceptance sample temperature; for be needed if To be Se par limits to be concentration. typically 1 to 4 discussion) discussion) high level As per Section 5.9 of Section 5.10 YP y 9 Surrogates Optional. Optional. determined determined USEPA!7260. liters.'Safe sample is b leb to or USEPA b lab. Sample suspected. Y 6021. D lab. Volume* 130% As per As s par As por As pw Irl As per Section 8.4 of Section 6.4 of As per SecUan Secttiiorn 8.4 ASection 8.4 Sec Sections To be As per Method Validation 8.4 of Uof USEPA W USEPA Internal Standards SEPA As per Section 5.10 Section 5.9 USEPA 800DB USEPA 9.2.2.3 of 6.12.2 and 9.4 determined 60008 80008 80008 BlX10B of USEPA 8260. USEPA TO- of USEPA TO. by lab.r" M USEPA Vapor-phase 15. 17. 8021. Minimum of 5 standards See levels,lowest are Appendix F at Reporting preferred. of this Minimum of 5 level. Minimum of 5 Minimum of 5 Liquid guidance for Minimum of 5 levels, levels,lowest Use method levels,lowest levels,lowest standards guidance f lowest at Reporting at Reporting acceptance at Reporting at Reporting may be used Accuracy/Precislon See Sae discus Initial Calibration level. level, criteria, level. level. for USEPA Metriz SplkelMetrix See Appendix F of 1�7a1 Appendix F Appendix F Recovery Use method Use method Preloaded Use method Use method Methods This guidance. OP Optional of this of this acceptance Spike Duplicate limits to be acceptance criteria. acceptance certified acceptance acceptance 8260,8015, guidance. guidance, limits criteria. standard criteria. criteria. 8021 and by tab. tubes maybe TO-17 Default-70. used for provided 130% calibration. calibration %RPD-25%. curve Is -- 3/3/2010 -37- 3/3/2010 -38-