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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(658)364-923,3 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,SULte 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton /980129-S1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9801 H79-02-08, 9801 H84-04 Reported Feb 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO20598802009A GCO20598802009A GCO20598802009A GCO20598802009A GCO20598802009A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 8020185 8020185 8020185 8020185 8020185 <br /> Sample Cone ND N D N D N D ND <br /> Prepared Date 2/5/98 2/5/98 2/5/98 2/5/98 2/5/98 <br /> Analyzed Date 2/5/98 2/5/98 2/5/98 2/5/98 2/5/98 <br /> Instrument I D # HP9 HP9 HP9 HP9 HP9 <br /> Conic Spiked 201tg/L 20 ug/L 20ug/L 60,ug/L 370 Ng/L <br /> Result 21 21 22 63 350 <br /> MS % Recovery 105 105 110 105 95 <br /> Dup Result 21 21 21 63 350 <br /> MSD % Recov 105 105 105 105 95 <br /> RPD 00 00 47 a0 00 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS020598 LC8020698 LCS020598 LCS020598 LCS020598 <br /> Prepared Date 2/5/98 2/5/98 2/5/98 2/5/98 2/5/98 <br /> Analyzed Date 2/5/98 2/5/98 2/5/98 2/5/98 2/5/98 <br /> Instrument I D # HP9 HP9 HP9 HP9 HP9 <br /> Conc Spiked 20Ng/L 20ug/L 20ug/L 60ug/L 370 ug/L <br /> LCS Result 21 21 21 64 350 <br /> LCS % Recov 105 105 105 107 95 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> OIA NA YTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> Z 1 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 /> ante erence,the LCS recovery is to be used to validate the batch <br /> enner <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 98011-179 BLA <2> <br /> CD <br />