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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> a- —N404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Straker Avenue Sint,8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Enviros Client Project ID ' Shell 620 W Charter Way <br /> 270 Perkins Ave Matrix Liquid <br /> -Sonoma, CA 95476 <br /> Attention Matt-Donohue Work Order# 9604D34 -01, 02 Reported Apr 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> i <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC BatCh#: GC041996BTEX17A GCO41996BTEX17A GC0411990TEX17A GC041996STD(17A <br /> Analy Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> I <br /> Analyst. J Woo J woo J Woo J Woo <br /> MS/MSD #: G9604857-03C G9604857-03C G9604857-03C G9604857-03C <br /> Sample Conc.: N D N D N D N D <br /> Prepared Date- 4/19/96 4/19/96 4/19/96 4/19/96 <br /> Analyzed Date 4/19/96 4/19/96 4/19/96 4/19/96 <br /> Instrument 1.13 # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc. Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result 9 4 93 9 2 27 <br /> MS %Recovery- 94 93 92 90 <br /> Dup Result 9 0 88 8 9 26 <br /> MSD % Recov. 90 88 89 87 <br /> RPD 43 55 33 38 <br /> RPD Limit. 0-50 0-50 0-50 0-50 <br /> LCS# GBLK041995A GBLKG41996A GBLK041996A GBLK041996A <br /> Prepared Date: 4/19/96 4/19/96 4/19/96 4/19/96 <br /> Analyzed Date. 4/19/96 4/19/96 4/19/96 4/19/96 <br /> Instrument I D #: GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cunc Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Result 9 0 90 90 27 <br /> LCS % Recov 90 90 90 90 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limds <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL 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 /> M>4kgor-y <br /> Project Manager "*MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9604D34 EEE <1> <br />