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Sequoia 680 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 /> IwoAnalytical 8tnrtc <br /> 19 Skcr Avenue,Su8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Onviros h n Client Project ID --Shell 4315 Waterloo, Stockton <br /> ,270 Perkins Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9602H91 -01 Reported Mar 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC030196BTEX17A GCO30196BTEX17A GC030196BTEX17A GC030196BTEK17A <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 #. G9602E58-06A G9602E58-06A G9602E58-06A G9602E58-06A <br /> Sample Conc N D N D N D N D <br /> Prepared Date: 3/1/96 3/1/96 3/1/96 3/1/96 <br /> Analyzed Date 3/1/96 3/1/96 3/1/96 3/1/96, <br /> Instrument I D.# GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc.Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result 88 88 87 26 <br /> MS % Recovery. 88 88 87 87 <br /> Dup Result 92 91 91 26 <br /> MSD %Recov- 92 91 91 87 <br /> RPD: 44 34 45 00 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS #- GBLK030196A GBLK030196A GBLK030196A GBLK030196A <br /> Prepared Date: 3/1/96 3/1/96 3/1/96 3/1/96 <br /> Analyzed Date 3/1/96 3/1/96 3/1/96 3/1/96 <br /> Instrument I D #. GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Result- 98 99 99 30 <br /> LCS %Recov - 98 99 99 100 <br /> F MS/MSD <br /> LCS <br /> Control Limits 70-130 7x-130 70-130 7D-130 <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 /> 4interference,the LCS recovery is to be used to validate the batch <br /> Mike gGr <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9B021-191 EEE <2> <br />