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ADVISORY— ACTIVE SOIL GAS INVESTIGATIONS <br />TABLE 2 (continued) <br />Preferred Analytical Methods and Modifications* <br />Method/ <br />Parameter <br />GC/MS Methods GC Methods <br />COMMENTS Modified <br />USEPA 8260 <br />Modified <br />USEPA TO-15 <br />Modified <br />USEPA TO-17 <br />Modified <br />USEPA 8015 and <br />Modified <br />USEPA 8021 <br />End of Run <br />Calibration Check Optional. Optional Optional <br />Mid-level calibration <br />standard run for each <br />20 sample batch or at <br />end of run, whichever <br />is more often. <br />See Appendix F <br />of this guidance <br />for discussion. <br />Surrogates <br />Surrogates needed <br />for glass bulbs but <br />not for syringes or <br />polymer sampling <br />bags. <br />Optional. Optional. <br />8015: To be Recovery acceptance limits to be determined <br />by lab. <br />Default=70- <br />130%. <br />determined by lab. (3) <br />8021: Surrogates <br />needed for glass bulbs <br />but not for syringes or <br />polymer sampling <br />bags. <br />Internal Standards As per Section 5.10 <br />of USEPA 8260. <br />As per Section <br />. 92.2.3 of USEPA <br />TO-15. <br />As per Sections 6.12.2 <br />and 9.4 of USEPA TO-17. <br />8015: To be <br />determined by lab. (3) <br />8021. As per Section <br />5.9 of USEPA 8021. <br />Accuracy/Precision <br />Matrix Spike/Matrix <br />Spike Duplicate <br />See Appendix F of <br />this guidance. Optional. Optional. <br />Recovery See Appendix F of this <br />guidance. <br />See Appendix F <br />of this guidance <br />for discussion. <br />acceptance limits <br />to be determined <br />by lab. <br />Default=70- <br />130% and <br />%RPD=25%. <br />Duplicates <br />One per 20 samples <br />or batch, whichever <br />is more often. <br />One per 20 samples <br />or batch, whichever is <br />more often. <br />One per 20 samples or <br />batch, whichever is more <br />often. <br />One per 20 samples or <br />batch, whichever is <br />more often. <br />See Appendix F of this guidance for discussion. <br />%RPD=25%. <br />Replicates <br />One per 20 samples <br />or batch, whichever <br />is more often. <br />One per 20 samples <br />or batch, whichever is <br />more often. <br />One per 20 samples or <br />batch, whichever is more <br />often. <br />One per 20 samples or <br />batch, whichever is <br />more often. <br />See Appendix F <br />of this guidance <br />for discussion. <br />%RPD=25%. <br />Laboratory Control <br />Samples (LCS) Optional. Not Required. Not Required. Optional. <br />See Appendix F <br />of this guidance <br />for discussion. <br />Method Detection <br />Limit/Reporting Limit <br />See Appendix F of <br />this guidance. <br />See Appendix F of <br />this guidance. <br />See Appendix F of this <br />guidance. <br />See Appendix F of this <br />guidance. <br />See Appendix F <br />of this guidance. <br />Reporting Limit <br />Verification <br />One per batch of <br />samples. (4) <br />One per batch of <br />samples. (4) <br />One per batch of <br />samples. (4) <br />One per batch of <br />samples. (4) <br />See Appendix F of this guidance <br /> for discussion. <br />Method Blanks <br />Method blank using <br />humidified lab grade <br />ultra-pure air as <br />sample and per <br />Section 8.4.1 of <br />USEPA 8260. <br />Analyze at least once <br />in a 24-hour <br />analytical sequence. <br />At least two are required <br />per monitoring exercise. <br />8015: Method blank <br />using humidified lab <br />grade ultra-pure air as <br />sample and per <br />Section 9.5 of USEPA <br />8015C. <br />8021: Per Section 8.4 <br />of USEPA 8021. <br />July 2015 <br /> 37