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Sequoia 680 Chesapeake Dnve 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 /> Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 931 0100 <br /> Blame Tech Services, Inc Client Project ID Shell Stockton/970206-H1 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9702564-04, -08 Reported Feb 21, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# GCO22097BTEX02A GCO22097BTEX02A GCO22097BTEX02A GCO22097BTEX02A <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 Conc N D N D N D N D <br /> Prepared Date 2/20/97 2/20/97 2/20/97 2/20/97 <br /> Analyzed Date 2/20/97 2/20/97 2/20/97 2/20/97 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Cone Spiked 10ug/L 10ug/L 10ug/L 30ug/L <br /> Result 91 90 91 28 <br /> WS % Recovery 91 90 91 93 <br /> Dup Result 92 91 91 29 <br /> MSD % Recov 92 91 91 97 <br /> RPD 11 11 00 35 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK022097 BLK022097 BLK022097 BLK022097 <br /> Prepared Date 2/20/97 2/20/97 2/20/97 2/20/97 <br /> Analyzed Date 2/20/97 2/20/97 2/20/97 2/20/97 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Cone Spiked 10ug/L 10ug/L 10ug/L 30ug/L <br /> LCS Result 84 83 83 26 <br /> LCS % Recov - 84 83 83 $7 <br /> 60-140 60-140 6D-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> 6:Jq <br /> Please NoteThe LCS 1s a control sample of known,interferent-free matrix that 1s analyzed using the same reagents, <br /> SYTICAL 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 /> Pner <br /> Pt Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9702584 BLA <3> <br />