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' Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1 404 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) 921 0100 <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942 /5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Chnsta Marting Work Order # 9702110 12, 13, 15 Reported Feb 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GCO20597E3TEX21A GCO20597BTEX21A GCO20597BTEX21A GCO20597BTEX21A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst G Fish G Fish G Rsh G Fish <br /> MS/MSD # 9701D1605 9701D1605 9701D1605 9701D1605 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 2/5/97 2/5/97 2/5/97 2/5/97 <br /> Analyzed Date 2/5/97 2/5/97 2/5/97 2/5/97 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br />' Conc Spiked 10pg/L 10pg/L 10jug/L 30ug/L <br /> Result 10 10 11 33 <br /> MS % Recovery 100 100 110 110 <br /> Dup Result 98 97 98 30 <br /> MSD % Recov 98 97 98 100 <br />' RPD 20 30 12 95 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK020597A BLK020597A BLK020597A BLK020597A <br />' Prepared Date 2/5/97 2/5/97 2/5/97 2/5/97 <br /> Analyzed Date 2/5/97 2/5/97 2/5/97 2/5/97 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10pg/L 10pg/L 10pg/L 30ug/L <br /> LCS Result 92 90 90 28 <br />' LCS % Recov 92 90 90 93 <br /> 60-140 60-140 60-140 60-140 <br />' LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> EQUOIA 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 If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix re <br /> i <br /> interference,the LCS recovery is to be used to validate the batch <br /> n Follett <br /> (-Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9702110 EEE <3> <br />