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7 Oy 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia <br /> 11 1 404N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> Analytical <br /> a 19 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br />' <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942, 51539 42 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Chnsta Marting Work Order# 9711733 05, 06 <br /> Reported Dec 9, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GC112-297BTEX02A GC112297BTEX02A GC112297BTEX02A GC112297BTEX02A GC112297BTEX02A <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 A Miraftab A Miraftab A.Miraftab A Miraftab A Miraftab <br /> MS/MSD # 971172601 971172601 971172601 971172501 971172601 <br /> Sample Conc N D N D N D N D N D <br />' Prepared Date 11/22/97 11/22/97 11/22/97 11/22/97 11/22/97 <br /> Analyzed Date 11/22/97 11/22/97 11/22/97 11/22/97 11/22/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10 ug/L 10g/L 10 frg/L 30 Ng/L 60 ug/L <br /> Result 11 11 11 32 77 <br /> MS % Recovery 110 110 110 107 128 <br /> 1• Dup Result 10 10 10 31 71 <br /> MSD % Recov 100 100 100 103 118 <br />' RPD 95 95 95 32 81 <br /> RPD Limit 0-25 0-25 0-25 0-25 0.25 <br />' LCS# BLK112297 BLK112297 BLK112297 BLK112297 BLK112297 <br /> Prepared Date 11/22/97 11/22/97 11/22/97 11/22/97 11/22/97 <br /> Analyzed Date 11/22/97 11/22/97 11/22/97 11/22/97 11/22/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br />' Conc Spiked 10 pg/L 10pg/L 10Ng/L 30 ug/L 60 pg/L <br /> LCS Result 10 99 10 31 71 <br /> LCS % Recov 100 99 100 103 118 <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,rnterferent-free matrix that is analyzed using the same reagents, <br /> EQUOIA ANAL ICAL 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 N <br /> 1 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 /> Ichard Herling <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9711732 EEE <4> <br />