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- \ Sequoia 680 Chesapeake Dnvc Redwood Cary CA 94063 (650) 364 9o00 FAX (650)364 9233 <br /> ■ �� 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FA.K (5 10)988 9673 <br /> Analyte cal 819 Sinker Avenue SULte 8 Sacramento CA 95834 (91 6) 921 9000 FAX (916)921 0100 <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd Ste 8-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9803307 24 Reported Apr 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC031498BTEX17A GC031498BTEX17A GC031498BTEX17A GC031498STEX17A GC031498BTEX17A <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 C DeMartini C DeMartini C DeMartini C DeMartini C DeMartini <br /> MS/MSD # 980305202 980305202 980305202 980305202 980305202 <br /> Sample Cone N D N D N D N D N D <br />' Prepared Date 3/14/98 3/14/98 3/14/98 3/14/98 3/14/98 <br /> Analyzed Date 3/14/98 3/14/98 3/14/98 3/14/98 3/14/98 <br /> Instrument I ❑ # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10ug/L 10ug/L 10 <br /> p9/L 30 Ng/L 60 ug/L <br /> Result 11 99 97 30 49 <br /> MS % Recovery 110 99 97 100 82 <br /> Dup Result 10 95 92 28 45 <br /> MSD % Recov 100 95 92 93 75 <br /> RPD 95 41 53 69 $5 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK031498 BLK031498 BLK031498 BLK031498 BLK031498 <br /> 9 <br />' Prepared Date 3/14/98 3/14/98 3/14/98 3/14/98 3/14/98 <br /> Analyzed Date 3/14/98 3/14/98 3/14/98 3/14/98 3/14/98 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br />' Cone Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60jig/L <br /> LCS Result 95 88 86 27 45 <br /> LCS % Recov 95 88 86 90 75 <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 interferent free matrix that Is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s 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 1s to be used to validate the batch <br /> RichardHerl g <br /> Project Mana er **MS=Matrix Spike, MSD=MS Duplicate RPD=Relative% Difference 9803305 EEE <11> <br />