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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364-9293 <br /> 5) 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 %00 FAX(510)988-9673 <br /> 5 Analytical 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton f 980129-S1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9801 H84-05-06 Reported Feb 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO20598802004A GCO20598802004A GCO20598802004A GCO20598802004A GCO20598802004A <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 ❑ Newcomb D Newcomb <br /> MS/MSD # 8020186 8020186 8020186 8020186 8020186 <br /> Sample Cone ND N D N D N D N D <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 # HP4 HP4 HP4 HP4 HP4 <br /> Cone Spiked 20ug/L 20ug/L 20ug/L 60ug/L 340 ug/L <br /> Result 19 19 19 56 440 <br /> MS % Recovery 95 95 95 93 129 <br /> Dup Result 20 20 18 320 350 <br /> MSD % Recov • 100 100 90 533 103 <br /> RPD 51 51 54 140 23 <br /> RPD Limit 0-20 0-20 020 0-20 0-50 <br /> LCS # LCS020598 LCS020598 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 # HP4 HP4 HP4 HP4 HP4 <br /> Cone Spiked 20ug/L 20ug/L 20ug/L 60ug/L 340 ug/L <br /> LCS Result 20 20 19 59 330 <br /> LCS % Recov 100 100 95 98 97 <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 /> TEI <br /> AL ICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> 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 /> er **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9801H79 BLA <4> <br />