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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> ,!D404 N W�get Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> �I Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> i <br /> Envlros Client Prole6f ID She11'141'N EI Dorado, Stock <br /> 270 Perkins Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely x Work Order# 9604470 -10, 15, 27 K Reported ry +Apr 22, 1996 v <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch#' GC-041196BTEC17A GC041196BTEX17A GC041196BTEX17A GCO41196BTEX17A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: J woo J Woo J Woo J Woo <br /> MS/MSD# G9603J21-06C G9603J21-06C G9603J21-06C 139603.121-0613 <br /> Sample Cone : N D N D N D N D <br /> Prepared Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Analyzed Date. 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Instrument 1.13 #: GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone. Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result* 97 98 97 29 <br />• MS % Recovery. 97 98 97 97 <br /> Dup Result: 93 92 92 27 <br /> MSD % Recov.: 93 92 92 90 <br /> RPD: 42 63 53 71 <br /> RPD Limit. 0-50 0-50 0-50 0.50 <br /> LCS#: GBLK041196A GBLK041196A GBLK041196A GBLK041196A <br /> Prepared Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Analyzed Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Instrument 1 D #. GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Result: 96 96 96 29 <br /> LCS % Recov.: 96 96 96 97 <br /> LCS 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 is analyzed using the same reagents, <br /> SECUOIA A ALYTICAL 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 /> Mike Gregory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9604470 EEE ¢4> <br />