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23. Benzene 24. n-Bulylbenzene activities,a RL that is health protective is appropriate for the initial 25. sec-Bulylbenzene screening when evaluating all targeted VOCs. 26. tert-Bulylbenzene 27. 1,4-Dichlorobenzene 2. For results with a high RL due to dilution,the laboratory should provide a 28. Di-isopropyl ether(DIPE) written explanation. Re-sampling and analyses may be required at the 29. Ethylbenzene appropriate RL for specific compounds. A higher RL as a result of sample 30. Ethyl tertiary butyl ether(ETBE) dilution is acceptable only for the compound(s)whose concentration in an 31. Isopropylbenzene undiluted sample exceeds the upper level of an initial calibration range. 32. p-Isopmpyltoluene Non-detected IN D)results for all target compounds shall be reported at 33. Methyl tertiary butyl ether(MTBE) the lowest dilution(s)or no dilution. 34. Naphthalene 35. n-Propylbenzene 3.4 Quality Assurance/Quality Control(QAIQC) • 36. Tertiary amyl methyl ether(TAME) 37. Tertiary butyl alcohol(TBA) The analytical laboratory should comply with the project Quality:Assurance 38. Toluene Project Plan(QAPP), EPA Methods,and the criteria included in this Advisory. 39. 1,2,4-Trichlorobenzene The analytical data should be consistent with the DQOs established for the 40. 1,2,4-Trimehtylbenzene project. Refer Appendix F for recommendations on analytical requirements. 41. Trimethylbenzene Xylenes 42. Xylenes The regulating agency staff may inspect the field and/or laboratory QA/QC procedures. Copies of the QA/QC plan and laboratory calibration data should be Others m` presented to the regulating agency field staff upon request. 43. Acetone - Document all calibration and QA/QC standards which should be traceable to a 44. Carbon disulfide source. Continuing calibration and QC standards,such as matrix spikes,should 45. 2-Hexanone -- be from a second source or a different lot from the same supplier, Vapor phase 46. Styrene standards are preferred, 47. Methyl ethyl ketone 48. Methyl isobbtyl ketone Al a minimum,the following criteria should be included in EPA Methods: 49. Ethylene dibromide . initial calibration Include or excludeadditional analytes based on site history and DQOs. A vapor- • daily calibration/continuing calibration intrusion specific list can be found in the Vapor Intrusion Guidance(Cal/EPA • laboratory control spike 2005p). . internal standards . 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: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 levels. The RLs for the tracer compound and analytes should be adjusted Field QC samples should be collected,stored,transported and analyzed in a accordingly. If the soil gas data are to be used to support risk assessment manner consistent with site samples. The following QC samples should be 3/3/2010 -33- 3/3/2010 -34-