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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 94398 (510) 988 9600 FAX(510)988 9673 <br /> x,11 Analytical 819 Sinker 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 Christa Marting Work Order # 9701A73 08 Reported Jan 31, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO12397BTEX03A GC012397BTEX03A GCO12397STEX03A GCO12397BTEX03A <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 Fish G Fish <br /> MS/MSD # 970164802 970164802 970164802 970164802 <br /> Sample Cone ND ND ND N D <br /> Prepared Date 1/23/97 1/23/97 1/23/97 1/23/97 <br /> Analyzed Date 1/23/97 1/23/97 1/23/97 1/23/97 <br /> Instrument i D # GCHP3 GCHP3 GCHP3 GCHP3 <br /> Cone Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> Result 10 10 11 31 <br /> MS % Recovery 100 100 110 103 <br /> Dup Result 10 11 11 33 <br /> MSD % Recov 100 110 110 110 <br /> RPD 00 95 00 63 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK012397A BLK012397A BLK012397A BLK012397A <br /> Prepared Date 1/23/97 1/23/97 1/23/97 1/23/97 <br /> Analyzed Date 1/23/97 1/23/97 1/23/97 1/23/97 <br /> Instrument I D # GCHP3 GCHP3 GCHP3 GCHP3 <br />' Cone Spiked 10pg/L 10yg/L 10pg/L 30pg/L <br /> LCS Result 10 10 10 30 <br /> LCS % Recov wo 100 100 100 <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 is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> ,!QZUIA 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 4 <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 /> Kevin Follett <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9701A73 EEE <3> <br />