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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) 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 Stockton/970206-H2 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9702578 -01 <br /> Reported Mar 4, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO21997BTEX02A GCO21997BTEX02A GCO219978TEX02A GCO21997BTEX02A <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# 970273409 970273409 970273409 970273409 <br /> Sample Cone N D N D N D N 0 <br /> Prepared Date 2/19/97 2/19/97 2/19/97 2/19/97 <br /> Analyzed Date 2/19/97 2/19/97 2/19/97 2/19/97 <br /> Instrument l D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Conc Spiked 10ug/L 10ug/L 10ug/L 30ug/L <br /> Result 99 98 98 31 <br /> MS % Recovery 99 98 98 103 <br /> • Dup Result 98 96 97 31 <br /> MSD % Recov 98 96 97 103 <br /> RPD 10 21 10 00 <br /> RPD Limit 0-25 025 0-25 0-25 <br /> LCS# BLK021997 BLK021997 BLK021997 BLK021997 <br /> Prepared Date 2/19/97 2/19/97 2/19/97 2/19/97 <br /> Analyzed Date 2/19/97 2/19/97 2/19/97 2/19/97 <br /> Instrument I D #- GCHP02 GCHP02 GCHP02 GCHP02 <br /> Cone Spiked 10ug/L 10ug/L 10ug/L 30ug/L <br /> LCS Result 86 8 5 86 27 <br /> LCS %Recov 86 85 86 90 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70130 <br /> S 10 <br /> Control ),irnit5 <br /> JPyPlease Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> 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 /> enner <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative %Difference 9702578 HLA <1> <br />