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Sequoia 680 Chesapeake Drive 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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 1=MCON Cfient Project ID ARCO 2168, Stockton, CA <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Dave Foley QC Sample Group 8020194-0200 Reported Feb 19, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X ones <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst L Bettencourt L Bettencourt L Bettencourt L Bettencourt <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS021798 LCS021798 LCS021798 LCS021798 <br /> Date Prepared 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Date Analyzed 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> . LCS % <br /> Recovery 90 89 90 90 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch# 8020277 8020277 8020277 8020277 <br /> Date Prepared 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Date Analyzed 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery * 88 60 • <br /> Matrix Spike <br /> Duplicate <br /> Recovery- * 100 90 <br /> Relative % <br /> Difference * 13 40 " <br /> S OIA ANALYTICAL Please Mote <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 *Matrix Interference <br /> Project Manager/Sacramento Laboratory <br /> 8020194 EMC <5> <br />