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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) 988 9673 <br /> Analytlea 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> • <br /> Blaine Tech Services, Inc Client Project ID ' Shell Stockton/970402-F1 Y <br /> v 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9704278 -11 Reported Apr 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte' Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#: GC041397BTEX17A GC041397STB(17A GC041397BTEX17A GC041397BTEX17A GC041397STEX17A <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.Miraftab A. Miraftab A-Miraftab A.Miraftab A. Miraftab <br /> MS MSD # 970437207B 9704372078 9704372078 9704372078 970437207B <br /> Sample Cone.: N D N D N D N D N D <br /> Prepared Date 4/13/97 4/13/97 4/13/97 4/13/97 4/13/97 <br /> Analyzed Date. 4/13/97 4/13/97 4/13/97 4/13/97 4/13/97 <br /> Instrument I D.#: GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10lig/L 10wg/L 10Ng/L 30ug/L 60pg/L <br /> Result: 10 10 10 31 62 <br /> MS %Recovery 100 100 100 103 103 <br /> 0 Dup. Result: 10 10 10 30 61 <br /> WiSD % Recov 100 100 100 100 102 <br /> RPD: 00 00 00 33 16 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK041397B-BS BLK041397B-BS BLK041397B-BS BLK041397B-BS BLK041397B-BS <br /> Prepared Date 4/13/97 4/13/97 4/13/97 4/13/97 4/13/97 <br /> Analyzed Date 4/13/97 4/13/97 4/13/97 4/13/97 4/13/97 <br /> Instrument I.D.#: GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10,ug/L 10 pg/L 10 Ng/L 30 Ng/L 60pg/L <br /> LCS Result: 10 11 10 31 61 <br /> LCS % Recov. 100 110 100 103 102 <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 /> 4" <br /> QI 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 0 <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 /> DPenn <br /> Man er **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9704278 SLA <4> <br />