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October 27, 2004 Lab ID STK437512 Micheline Doyle Kipf Customer 3-14626 Quality Control - Organic Constituent Method Date/1D Type Units Cone QC Data DQO Note Tert amyl methyl Ether (TAME) 5242 10/26/2004 A209 BS ug/L 1000 779% 67-129 BSD ug/L 1000 670% 67-129 BSRPD ug/L 1 1 53 00 5242 10/26/2004 A 00-CCV ug/L 1000 72 1% 70-130 Toluene 5242 10/26/2004 A209 Blank uglL ND <0 5 BS ug/L 1000 78 8% 78 126 BSD uglL 1000 790% 78-126 BSRPD ug/L 03% 516 4 5242 10/26/2004 A 00-CCV ug/L 1000 75 9% 70-130 Xylenes m,p 5242 10/26/2004 A209 Blank ug/L ND CO 5 BS ug/L 2000 74 1% 82-145 435 BSD ug/L 2000 78 1% 82-145 435 BSRPD ug/L 5 2% 518 0 5242 10/26/2004 A 00-CCV ug/L 2000 742% 70-130 Xylenes o 5242 10/26/2004 A209 Blank ug/L ND <05 BS ug/L 1000 772% 82-132 435 BSD ug/L 1000 81 4% 82-132 435 BSRPD ug/L 5 3% 516 6 5242 10/26/2004 A 00-CCV ug1L 1000 748% 70-130 Explanations 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 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 CCV Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria ND ,!Von-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 • STK437512 Quality Control Page 2