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Sequoia 680 Chesapeake Dnve Redwood City Ca 94063 (415) 364 9600 FAX (415) 364 92 3 <br /> 404 N W+get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 9S8 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 / 8373942 1307 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br />' Attention Tracy Faulkner Work Order# 9602A05 03, 04, 15 Reported Feb 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br />' Analyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br />' DC Batch# GCO2209613TEX17A GCO22096BTEX17A GCO220966TD(17A GCO22096STEX17A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J Woo J Woo J Woo <br /> MS/MSD# 960245105 960245105 960245105 960245105 <br /> Sample Cone . N D N D N D N D <br />' Prepared Date 2/20/96 2/20/96 2/20/96 2/20/96 <br /> Analyzed Date- 2/20/96 2/20/96 2/20/96 2/20/96 <br /> Instrument 1.13 #- GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10ug/L 10wg/L 10ug/L 30ug/L <br /> Result: 99 99 97 29 <br /> MS % Recovery: 99 99 s7 97 <br /> Dup. Result. 98 97 96 29 <br /> MSD % Recov : 98 97 96 97 <br />' RPD 10 20 10 00 <br /> RPD Limit: 0-50 0-50 0-50 0-50 <br /> LCS#: BLK022096 BLK022096 BLKD22096 BLK022096 <br />' Prepared Date 2/20/96 2/20/96 2/20/96 2/20/96 <br /> Analyzed Date. 2/20/96 2/20/96 2/20/96 2/20/96 <br /> Instrument I D #: GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone. Spiked- 10ug/L 10ug/L 10ug/L 30ug/L <br /> iLCS Result: 97 97 96 29 <br /> LCS % Recov : 97 97 96 97 <br /> 1 <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 /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike Is an aliquot of samplZe <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 /> Kevin Follett interference,the LCS recovery is to be used to validate the batch <br /> Project Manager '*MS=Matrix Spike, MSD=MS Duplicate, RPD Relative%Difference g602M5 EEE <3> <br />