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Sequoia <br /> 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 968 9600 FAX (5 10)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Tracy/970207-1-13 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order # 9702579 -01, -04 Reported Mar 4, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte' Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21897BTEX02A GCO21897BTEX02A GCO21897BTEX02A GCO21897BTEX02-A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A. Miraftab A. Miraftab A Miraftab A. Miraftab <br /> MS/MSD# 970249011 970249011 970249011 970249011 <br /> Sample Conc : N D N D N D N D <br /> Prepared Date 2/18/97 2/18/97 2/18/97 2/18/97 <br /> Analyzed Date 2/18/97 2/18/97 2/18/97 2/18/97 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Conc Spiked 10pg/L 10ug/L 10ug/L 30Mg/L <br /> Result 10 9 8 9 8 31 <br /> MS % Recovery 10o 98 98 103 <br /> Dup Result 10 99 99 31 <br /> MSD % Recov 100 99 99 103 <br /> RPD 00 10 10 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS# BLK021897 BLK021897 BLK021897 BLK021897 <br /> Prepared Date 2/18/97 2/18/97 2/18/97 2/18/97 <br /> Analyzed Date 2/18/97 2/18/97 2/18/97 2/18/97 <br /> Instrument 1.13 # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Conc Spiked 10pg/L 10ftg/L 10yg/L 30Erg/L <br /> LCS Result: 10 10 10 32 <br /> LCS % Recov.: 100 100 100 107 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limit <br /> Please Note <br /> /} The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUA ALYTICAL 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 /> Pe gy Penner <br /> Prol Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative's Difference 9702579 BLA 41> <br />