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�} IT) Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Iwo Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 40N Client e b pro' t <br /> f c I ARCb 2168, Stockton, CA <br /> 1433 N Market Blvd Matrix Air <br /> Sacramento, CA 95834 <br /> Attention Matt Turner QC Sample Group 8030576-0577 Reported Mar 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X lenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS031398 LCS031398 LCS031398 LCS031398 <br /> Date Prepared 03/13/98 03/13/98 03/13/98 03/13/98 <br /> Date Analyzed 03/13/98 03/13/98 03/13/98 03/13/98 <br /> nstrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery 106 103 101 100 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch # BS031398 BS031398 BS031398 BS031398 <br /> Date Prepared 03/13/98 03/13/98 03/13/98 03/13/98 <br /> Date Analyzed 03/13/98 03/13/98 03/13/98 03/13/98 <br /> nstrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 106 103 101 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 102 100 98 97 <br /> Relative % <br /> Difference 3 8 30 3 0 30 <br /> iEQUOIA ANALYTICALPlease Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> u/// L✓ preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the OC limits for MS/MSD s are advisory only <br /> ionald W Bobel and are not used to accept or refect batch results <br />'rofect Manager/Sacramento Labors ory <br /> 8030576 EMC <5> <br />