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' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 404 N WLgct Lane Walnut Creek,CA 94,598 (510) 988 9600 FAX(510)988 9673 <br /> qww Analytical B 19 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton/970708-Fl <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9707594-08 Reported Jul 28, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#: GC071797BTEX02A GC0717978TEX02A GC071797BTEX02A GC071797BTEX02A GC071797BTEX02A <br /> Analy. Method' EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA S015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A. Miraftab A. Miraftab A. Miraftab A.Miraftab A Miraftab <br /> MS/MSD#: 970759212 970759212 970759212 970759212 970759212 <br /> Sample Cone - N D N D N D N D N D <br /> Prepared Date 7/17/97 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Analyzed Date 7/17/97 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Instrument I D #. GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Cone. Spiked. 10pg/L 10ug/L 10Ng/L 30pg/L 60Ng/L <br /> Result 9 5 9 2 92 28 57 <br /> % Recovery/ 95 92 92 93 95 <br /> Dup Result 95 92 93 28 63 <br /> MSD % Recov. 95 92 93 93 105 <br /> RPD 00 00 11 00 10 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK071797 BLK071797 BLK071797 BLK071797 BLK071697 <br /> Prepared Date- 7/17/97 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Analyzed Date 7/17/97 7/17/97 7/17/97 7/17/97 7/17/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Cone Spiked 10pg/L 10pg/L 10ug/L 30Ng/L 60pg/L <br /> LCS Result 10 97 97 29 65 <br /> LCS % Recov.: 100 97 97 97 108 <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 /> 0 NALYTICAL 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 1s to be used to validate the batch <br /> eg enner <br /> Pr ect Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9707594 SLA <5> <br />