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Sequoia 660 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 986 9600 FAX(5 10)986 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> E A Engineering Science &Tech Client Project ID Exxon 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Chnsta Marting Work Order# 9707$97 06 Reported Aug 5, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO72997BTEX02A GC072997BTEX02A GCi772997BTEX02A GCO72997BTEX02-A GC072897BTEX03A <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 k Miraftab A Miraftab A Miraftab A Miraftab A.Miraftab <br /> MS/MSD # 9707B8510 970788510 970788510 9707B8510 9707BB510 <br /> Sample ConC N D N D N D N D N D <br />' Prepared Date 7/29/97 7/29/97 7/29/97 7/29/97 7/29/97 <br /> Analyzed Date 7/29/97 7/29/97 7/29/97 7/29/97 7/29/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br />' Conc Spiked 10pg/L 10pg/L 10ug/L 30 ug/L 50ug/L <br /> Result 10 10 10 31 69 <br /> MS % Recovery 100 100 100 103 115 <br /> Dup Result 99 97 9 9 30 67 <br /> MSD %Recov 99 97 99 100 112 <br /> RPD 10 30 10 33 29 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK072997 BLK072997 BLK072997 BLK072997 BLK072997 <br />' Prepared Date 7/29/97 7/29/97 7/29/97 7/29/97 7/29/97 <br /> Analyzed Date 7/29/97 7/29/97 7/29/97 7/29/97 7/29/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10yg/L 10}tg/L 10pg/L 30yg/L 60Ng/L <br /> LCS Result 10 9 8 10 30 67 <br /> LCS % Recov 100 98 100 100 112 <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 /> J,JEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s 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 /> evin Follett <br /> Project Manager "*MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9707697 EEE <3> <br />