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3 a <br /> (D— Analytica <br /> 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 /> l819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100I <br /> Envlros Client Project ID Shell 4315 Waterloo, Stockton f <br /> ,270 Perkins Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 96021-194 -01 Reported Mar 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. GC030196STE)(17A GC030196BTE)(17A GC030196BTEX17A GCO30196BTEX17A <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 G9602E58-05A 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 /> Cone Spiked. 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result 88 813 87 26 <br /> MS %Recovery 88 88 87 87 <br /> Dull. 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 G13LK030196A GBLK030196A <br /> Prepared Date 3/1/96 3/11/96 3/1/96 3/1/96 <br /> Analyzed Date 3/1/96 3/1/96 3/1/96 3/1/96 <br /> Instrument LD #: 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 /> LCS <br /> Control Limits 70-130 70-130 70-130 70-130 <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 /> 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=Retative%Difference 9602H94 EEE <3> <br />