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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 94598 (510) 988 9600 FAX(510) 988 9673 <br /> 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 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br />' Attention Tracy Faulkner Work Order# 961 OA56 01, 05-07, 09 Reported Oct 25, 1996 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene - <br /> QC Batch#- GC101896BTEX02A GC101896BTEX02A GC101896BTEX02A GC101896BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst Y Arteaga Y Arteaga Y Arteaga Y Arteaga <br /> MS/MSD # 961075503 961075503 961075503 961075503 <br />' Sample Conc . N D N D N D N D <br /> Prepared Date 10/18/96 10/18/96 10/18/96 10/18/96 <br /> Analyzed Date 10/18/96 10/18/96 10/18/96 10/18/96 <br />' Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10pg/L 10ug/L 10pg/L 30pg/L <br /> Result 11 97 94 26 <br /> MS % Recovery 110 97 94 87 <br /> Dup Result 10 91 88 25 <br /> MSD % Recov 1D 91 88 83 <br />' RPD 95 64 66 39 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS # BLK101896 BLK101896 BLK101896 BLK101896 <br />' Prepared Date 10/18/96 10/18/96 10/18/96 10/18/96 <br /> Analyzed Date 10/18/96 10/18/96 10/18/96 10/18/96 <br />' Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10ug/L 10ug/L 10Ng/L Wug/L <br /> LCS Result 12 10 10 28 <br /> LCS % Recov 120 100 100 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 is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> U IA 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 <br /> nterference,the LCS recovery is to be used to validate the batch <br /> Ke In Follett <br />' ject Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9610A56 EEE <1> <br />