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23. Benzene activities,a RL that is health protective is appropriate for the initial 24. n-Butylbenzene screening when evaluating all targeted VOCs. 25. sec-Butylbenzene 26. cert-Butylbenzene 2. For results with a high RL due to dilution,the laboratory should provide a 27. 1,4-Dichlorobenzene written explanation. Re-sampling and analyses may be required at the 28. Di-isopropyl ether(DIPE) appropriate RL for specific compounds. A higher RL as a result of sample 29. Ethylbenzene dilution is acceptable only for the compound(s)whose concentration in an 30. Ethyl tertiary butyl ether(ETBE) undiluted sample exceeds the upper level of an initial calibration range. 31. Isopropylbenzene Non-detected(ND)results for all target compounds shall be reported at 32. p4sopropyltoluene the lowest dilution(s)or no dilution. 33. Methyl tertiary butyl ether(MTBE) 34. Naphthalene 3.4 Quality Assurance/Quality Control(QA/QC) 35. n-Propylbenzene 36. Tertiary amyl methyl ether(TAME) The analytical laboratory should comply with the project Quality Assurance 37. Tertiary butyl alcohol(TBA) Project Plan(QAPP), EPA Methods,and the criteria included in this Advisory. 38. Toluene " ?_ The analytical data should be consistent with the DQOs established for the 39. 1,2,4-Trichlorobenzene project. Refer Appendix F for recommendations on analytical requirements. 40. 1,2,4-Trimehtyl benzene 41. 1,3,5-Trimethylbenzene The regulating agency staff may inspect the field and/or laboratory QA/QC 42. Xylenes procedures. Copies of the QA/QC plan and laboratory calibration data should be presented to the regulating agency field staff upon request. Others Document all calibration and QA/QC standards which should be traceable to a 43. Acetone source. Continuing calibration and QC standards,such as matrix spikes,should 44. Carbon disulfide be from a second source or a different lot from the same supplier. Vapor phase 45. 2-Hexanone standards are preferred. 46. Styrene 47. Methyl ethyl ketone At a minimum,the following criteria should be included in EPA Methods: 48. Methyl isobutyl ketone 49. Ethylene dibromide • initial calibration • daily calibration/continuing calibration Include or exclude additional analytes based on site history and DQOs. A vapor- • laboratory control spike intrusion specific list can be found in the Vapor Intrusion Guidance(Cal/EPA internal standards 2005a). surrogates • method blank 3.3 Reporting Limits for Target Compounds • field blank Consideration and determination of appropriate reporting limits(RLs)should be All surrogate recovery data should comply with the laboratory derived control limits. based on the DQOs of the investigation. For data evaluation purposes,surrogate recovery limits should be t 25 percent. Recovery levels are dependent on sample introduction technique and are 1. During the workplan development,the target concentrations should be compound specific. If this limit is not selected,provide an explanation justifying the identified for the site specific compounds of potential concern and select limit used. See Appendix F for surrogate introduction techniques. appropriate analytical methods to achieve the RLs at or below the target Field QC samples should be collected,stored,transported and analyzed in a levels. The RLs for the tracer compound and analytes should be adjusted manner consistent with site samples. The following QC samples should be accordingly. If the soil gas data are to be used to support risk assessment 3/3/2010 -33- 3/3/2010 -34-