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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 H Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5t0) 988 9673 <br /> Analytica s,9 S�r'ker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942 51539421307 <br /> 9 9 i / <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Marla Guensler Work Order# 9604E22 02-03, 12-13 Reported May 13, 1996 <br />' 9604E23 21-26 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> OC Batch# GC042496STEC17A GC0424968TEX17A GC042496BTEX17A GC042496STEX17A <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 # 960485903 960485903 960485903 960485903 <br /> Sample Conc N D N D N D N D <br /> Prepared Date. 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Analyzed Date. 4/24/96 4/24/96 4/24/96 4/24/96 <br />' Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spilled 10ug/L 10ug/L 10ug/L 30ug/L <br /> Result 10 10 99 29 <br /> MS % Recovery too 100 99 97 <br /> Dup Result 92 92 91 27 <br /> MSD %Recov .. 92 92 91 90 <br />' RPD 83 83 84 71 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> 1 <br /> LCS # BLK042496 BLK042496 BLK042496 BLK042496 <br />' Prepared Date 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Analyzed Date 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Instrument I D #. GCHP17 GCHP17 GCHP17 GCHP17 <br />' Conc Spiked 1 o ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Result 99 99 98 29 <br />' LCS % Recov • 99 99 98 97 <br /> 60-140 60-140 60-140 60-140 <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 /> 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 tf <br /> { � n the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> V <br /> interference,the LCS recovery is to be used to validate the batch <br /> Kevin Follett <br />' Project Manager 'MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9604E22 EEE <2> <br />