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.> <br /> Sequoia 680 Chesapeake Dave Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94595 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> r <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 8020225-0233 Reported Feb 12, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 6020 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# LCS021198 LCS021198 LCS021198 LCS021198 <br /> Date Prepared 02/11/98 02/11/98 02/11/98 02/11/98 <br /> Date Analyzed 02/11/98 02/11/98 02/11/98 02/11/98 <br /> Instrument I D # GCHP 1 GCHP 1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery 102 98 103 102 <br /> Control Limits 70-130% 70130% 70 130% 70 130% <br /> MS/MSD <br /> Batch # 8020226 8020226 8020226 8020226 <br /> Date Prepared 02/11/98 02/11/98 02/11/98 02/11/98 <br /> Date Analyzed 02/11/98 02/11/98 02/11/98 02/11/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP 1 GCHP 1 <br /> Matrix Spike <br /> % Recovery 84 86 88 88 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 82 82 86 87 <br /> Relative % <br /> Difference 24 48 23 11 <br /> UOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> ✓'`r '* preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> L validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only <br /> Ronald W Bobel and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 8020225 EMC <5> <br />