Documentation and QA 

 Review of Chemical Data 



• Procedures for QAyQC reporting and responsible federal and 

 state QA officers 



• Mechanisms for approval of alterations to the monitoring pro- 

 gram, for suspending sample analyses, and for stopping sample 

 analyses within a tiered design. 



Relevant portions of the QA plain should be incorporated in the 

 statement of work for each contract laboratory involved in sample 

 analyses. 



Adequate documentation of the results of chemical analyses are 

 needed to ensure proper interpretation of the data. If a contract 

 laboratory is performing the sample analyses, such documentation 

 should be specified in the original statement of work. The documenta- 

 tion listed below is recommended for chemical residue data: 



• A cover letter discussing analytical problems (if any) and 

 referencing or describing the procedure used 



• Reconstructed ion chromatograms for each sample analyzed 

 by gas chromalography/mass spectrometry (GC/MS) 



• Mass spectra of detected target compounds for each sample 

 analyzed by GC/MS 



• Chromatograms for each sample analyzed by gas chromatog- 

 raphy/electron capture detection (GC/ECD) and/or gas 

 chromatography/flame ionization detection (GC/FID) 



• Raw data quantification reports for each sample 



• A calibration data summary reporting calibration range used 

 [and decafluorotriphenylphosphine (DFTPP) and 

 bromofluorobenzene (BFB) spectra and quantification report 

 for GC/MS analyses] 



• Final dilution volumes, sample size, wet-to-dry ratios, and 

 instrument detection limit 



• Analyte concentrations with reporting units identified (to two 

 significant figures unless otherwise justified) 



• Quantification of all analytes in method blanks (ng/sample) 



• Method blanks associated with each sample 



• Tentatively identified compounds (if requested) and methods 

 of quantification (include spectra) 



• Recovery assessments and a replicate sample summary 

 (laboratories should report all surrogate spike recovery data 

 for each sample; a statement of the range of recoveries should 

 be included in reports using these data) 



• Data qualification codes and their definitions. 



The data reporting forms for the EPA Contract Laboratory Program 

 illustrate an appropriate format for documentation of chemical data. 



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