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Sequoia 680 Chesapeake Drive Redwood City CA 940,53 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)931 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton/970401-F2 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9704289-02, -06 Reported Apr 16, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC041097BTD(17A GC041097BTEX17A GC041097BTEX17A GC041097STEX17A GC041097BTEX17A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 80t5M <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# 970429801 970429801 970429801 970429801 970429801 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 4/10/97 4/10/97 4/10/97 4/10/97 4/10/97 <br /> Analyzed Date 4/10/97 4/10/97 4/10/97 4/10/97 4/10/97 <br /> Instrument LD # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10pg/L 10pg/L 10pg/L 30ug/L 60ug/L <br /> Result 94 95 9 4 29 55 <br /> MS % Recovery 94 95 94 93 92 <br /> • Dup Result 10 10 10 31 60 <br /> MSD % Recov 100 100 100 103 100 <br /> APD 62 51 62 67 87 <br /> RPD Limb 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK041097 BLK041097 BLK041097 BLK041097 ELK041097 <br /> Prepared Date 4/10/97 4/10/97 4/10/97 4/10/97 4/10/97 <br /> Analyzed Date 4/10/97 4/10/97 4/10/97 4/10/97 4/10/97 <br /> Instrument I D.#. GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Colic Spiked 10ug/L 10 fug/L 10ug/L 30ug/L 60ug/L <br /> LCS Result 95 93 93 28 55 <br /> LCS % Recov 95 93 93 93 92 <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 /> SB IA 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 is to be used to validate the batch <br /> egg Penner <br /> of t Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9704289 BLA <2> <br />