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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> s 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 /> *Blainiii'Tiii6h Services, lnc Client Project ID Shell Stockton /970716-S1 <br /> ,1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> .Attention Fran Thie Work Order# 9707820-02 Reported Jul 24, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#- GC071797STEX07A GC0717976TEX07A GC071797BTEX07A GC071797BTEX07A GC071797BTEX07A <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' A. Porter A Porter A.Porter A-Porter A Porter <br /> MS/MSD # 970765605 970765605 970765605 970765605 970765605 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 7/17/97 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Analyzed Date 7/17/97 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc. Spiked 10pg/L 10pg/L lopg/L 30pg/L 60pg/L <br /> Result 89 87 88 27 60 <br /> MS % Recovery- 89 87 88 90 100 <br /> . Dup Result 82 80 80 24 55 <br /> MSD %Recov .. 82 80 80 80 92 <br /> RPD 82 84 95 12 87 <br /> RPD Limn 0-25 0-25 0-25 0-25 0-25 <br /> LCS #' BLK071797 BLK071797 BLK071797 BLK071797 BLK071797 <br /> Prepared Date 7/17/97 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Analyzed Date 7/17/97 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc. Spiked. long/L 10pg/L lopg/L 30pg/L 60pg/L <br /> LCS Result 90 88 90 27 61 <br /> LCS % Recov 90 68 90 90 102 <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 /> /1 The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SED la AN 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 /> eq y e er <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9707820 8 L <2> <br />