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' Sequoia 680 Chesapeake Drive Redwood Ciry CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5t0)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 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Chnsta Marting Work Order# 9704171 01, 02, 04, 08 Reported Apr 18, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GCG4089713TEX21A GCO40897BTEX21A GC040897BTEX2IA GC040897BTEX21A GC040897BTEX21A <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 D Jirsa D Jirsa D Jirsa D Jirsa D Jima <br /> MS/MSD# 9703E5404 9703E5404 9703E5404 9703E5404 9703E5404 <br />' Sample Conc N D N D N D N D N D <br /> Prepared Date 4/8/97 4/8/97 4/8/97 4/8/97 4/6/97 <br /> Analyzed Date 4/8/97 4/8/97 4/8/97 4/8/97 4/8/97 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br />' Conc Spiked 10ug/L 1opg/L 10ug/L 3oug/L acus/L <br /> Result 9 5 95 96 29 59 <br /> MS % Recovery 95 95 96 97 98 <br /> Dup Result 10 10 10 30 62 <br /> MSD % Recov 100 100 100 100 103 <br />' RPD 51 51 41 34 50 <br /> RPD Limit 0.25 0-25 0-25 0-25 425 <br /> LCS# BLKG40897 BLK040897 BLK040897 BLK040897 BLK040897 <br />' Prepared Date 4/8/97 4/8/97 4/8/97 4/8/97 4/8/97 <br /> Analyzed Date 4/8/97 4/8/97 4/8/97 4/8/97 4/8/97 <br /> Instrument 1.13 # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br />' Conc Spiked 1Oug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> LCS Result 96 9 7 9 8 30 61 <br /> LCS %Recov 96 97 98 100 102 <br /> 54140 60-140 60-140 60-140 60-140 <br />' LCS 70-130 74130 70-130 70-130 74130 <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 /> SEQU 1A ANALYTI 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 /> interference,the LCS recovery is to be used to validate the batch <br /> evm offett <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9704171 EEE <1> <br /> 1 <br />