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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) 988 9600 FAX(510)938,9673 <br /> 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)91} 0100 <br /> VQW " <br /> Analytical <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton/970716-S1 r <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> ,Attention Fran Thie Work Order# 9707820 -01 Reported Jul 24, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC071897BTEC06A GC071897BTEX06A GC071897STEX06A GCO71897BTEX06A GCO71897BTEX06A <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 A Porter A Porter A Porter A Porter A Porter <br /> MS/MSD # 970759301 970759301 970759301 970759301 970759301 <br /> Sample Corte. N D N D N D N D N D <br /> Prepared Date 7/18/97 7/18/97 7/18/97 7/18/97 7/18/97 <br /> Analyzed Date 7/18/97 7/18/97 7/18/97 7/18/97 7/18/97 <br /> Instrument LD # GCHP6 GCHP5 GCHP6 GCHP6 GCHP6 <br /> Cone Spiked 10pg/L 101ug/L 10pg/L 30pg/L 60pg/L <br /> Result 78 75 75 21 53 <br /> MS % Recovery 78 75 75 70 88 <br /> Dup Result 87 83 82 24 58 <br /> MSD % Recov. 87 83 82 80 97 <br /> RPD 11 10 89 13 90 <br /> RPD Limit: 0-25 0-25 0-25 0-25 0-25 <br /> LCS#: BLK071897 BLK071897 BLK071897 BLK071897 BLK071897 <br /> Prepared Date: 7/18/97 7/18/97 7/18/97 7/18/97 7/18/97 <br /> Analyzed Date: 7/18/97 7/18/97 7/18/97 7/18/97 7/18/97 <br /> Instrument I D #: GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Cone. Spiked: 10pg/L 10pg/L 10pg/L 30pg/L 60pg/L <br /> LCS Result. 87 83 83 24 58 <br /> LCS % Recov . 87 83 83 So 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 /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> Z7enner <br /> 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 procedu <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to mat <br /> interference,the LCS recovery is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9707820 BLA <1> <br />