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c Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N W�get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)986 9673 <br /> frilly Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 92f 9600 FAX(916)921 0100 <br /> EMCON Client Project ID Arco 548 Stockton CA <br /> 1433 N Market Blvd Matrix Soil <br /> Sacramento, CA 95834 <br /> Attention Mark Capps QC Sample Group 8020348-0361 Reported Feb 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> LLNAALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS021898 LCS021898 LCS021898 LCS0218913 <br /> Date Prepared 02/18/98 02/18/98 02/18/98 02/18/98 <br /> Date Analyzed 02/18/98 02/18/98 02/18/98 02/18/98 <br /> Instrument I D # GCHP 1 GCHP-1 GCHP 1 GCHP-1 <br /> LCS % <br /> Recovery 98 99 100 101 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch # 8020405 8020405 8020405 8020405 <br /> Date Prepared 02/18/98 02/18/98 02/18/98 02/18/98 <br /> Date Analyzed 02/18/98 02/18/98 02/18/98 02/18/98 <br /> Instrument I D # GCHP 1 GCHP 1 GCHP 1 GCHP 1 <br /> Matrix Spike <br /> % Recovery 82 81 67 89 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 82 80 86 88 <br /> Relative % <br /> Difference 00 1 2 1 2 1 1 <br /> AakQUOIA ANALYTICAL Please Note <br /> / - The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> 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 QC limits for MS/MSDs are advisory only <br /> Ronald W Bobel and are not used to accept or reject batch results <br /> Project Manager/Sacramento Lab oratory <br /> 8020348 EMC <8> <br />