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Sequoia 660 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 815 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Envlros Client Project lD Shell 1267 Country Club, Stick <br /> 270 Perkins Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9704512 09 Reported Apr 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#. GC041597BTEXOIA GC041597BTEXOIA GC041597BTEX01A GC041597ETEX01A GC041597BTEX01A <br /> Analy. Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst R Geckler R Geckler R Geckler R Geckler R Geckler <br /> MS/MSD # 970428106 970428106 970428106 970428106 970428106 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 4/15/97 4/15/97 4/15/97 4/15/97 4/15/97 <br /> Analyzed Date 4/15/97 4/15/97 4/15/97 4/15/97 4/15/97 <br /> Instrument I D # GCHP1 GCHPI GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 10ug/L 10pg/L 10ug/L 30ug/L 60pg/L <br /> Result 11 11 11 31 59 <br /> MS % Recovery 110 110 110 103 98 <br /> • Dup Result 12 11 11 32 64 <br /> MSD % Recov 120 110 110 107 107 <br /> RPD 87 00 00 32 81 <br /> RPD Limit 0-25 0-25 0-25 0-25 0'25 <br /> LCS #: BLK041597BSA BLK0415976SA LK041597BSA BLK041597BSA BLK041597BSA <br /> Prepared Date 4/15/97 4/15/97 4/15/97 4/15/97 4/15/97 <br /> Analyzed Date' 4/15/97 4/15/97 4/15/97 4/15/97 4/15/97 <br /> Instrument I D # GCHP1 GCHPI GCHPI GCHP1 GCHP1 <br /> Conc Spiked' 10ug/L 10Ng/L 10Ng/L 30pg/L 60pg/L <br /> LCS Result 11 11 10 31 59 <br /> LCS %Recov 110 110 100 103 98 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA A LYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recovery is to be used to validate the batch <br /> eProjectManager **MS=Matrix Spike,MSD=MS Duplicate, RPD Relative% Difference 9704512 EEE a 17> <br />