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R v M . December 15, 2004 Lab ID STK438223 Micheline Doyle Kipf Customer 3-14626 Quality Control - Organic =Constituent Method Date/ID Type Units Conc QC Data DQO Note Toluene 5030B 11/30/2004 A233 MS ug/L 5000 857% 73-128 (SP 412128 02) MSD ug/L 5000 964% 73-128 MSRPD ug/L 11 8% X23 6 8260B 11/30/2004 A 00-CCV ug/L 5000 964% 80-120 Toluene-d8-Surrogate 50308 11/30/2004 A233 Blank ug/L 2500 916% 84-112 LCS ug/L 2500 920% 84-112 MS ug/L 25 00 95 1% 84-112 (SP 412128-02) MSD ug/L 25 00 906% 84-112 8260B 11/30/2004 A 01-CCV ug/L 25 00 102% 70-130 Xylenes in p 50308 11/30/2004 A233 Blank ug/L ND C I 8260B 11/30/2004 A 00-CCV ug/L 1000 109% 70 130 Explanations 210 The method blank was positive However, samples reported were either ten times greater than the blank concentration or non detect and accepted 305 LCS not within Acceptance Range (AR) Data could not be confirmed by reanalysis Results were reported with client approval 310 LCS above Acceptance Range (AR) Samples which were non detect for this analyte were accepted 320 LCS not within Acceptance Range (AR) Data was accepted based on the BS/BSD recovery 355 CCV not within Acceptance Range (AR) Results were reported with client approval 360 CCV above Acceptance Range (AR) Samples which were non detect for this analyte were accepted 410 Relative Percent Difference (RPD) not within Maximum Allowable Value (MAV) Data was accepted based on the LCS or CCV recovery 435 Sample matrix may be affecting this analyte Data was accepted based on the LCS or CCV recovery Definitions Blank Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples LCS Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery PDS Post Digestion Spike (TCP/GPAA) MS/MSD Matrix Spikes - A random sample is spiked with a known amount of analyte The recoveries are an indication of how that sample matrix affects analyte recovery BS/BSD Blank Spikes - A blank is spiked with a known amount of analyte It is prepared to verify that the preparation process is not affecting analyte recovery Dup Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate The relative percent difference is an indication of precision for the preparation and analysis CCB Continuing Calibration Blank - Analyzed to verify the instrument baseline is within criteria CCV Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria ND Non-detect - Result was below the DQO listed for the analyte DQO Data Quality Objective - This is the criteria against which the quality control data is compared STK438223 Quality Control Page 13