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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 111 W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> frilly Analyti cal 815 Striker Avenue Suite 8 Sacramento CA 95834 (916) 911 9600 FAX (916)921 0100 <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 Christa Marting Work Order# 9708E45-02, 07, 08 Reported Sep 11, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Anafyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GC0829976TEX06A GC082997BTEX06A GC082997BTEX06A GC082997BTEX06A GC0829978TEX06A <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 R Geckler R Geckler R Geckler R Geckler R Geckler <br /> MS/MSD# 9708B9205 9708139205 970809205 970SB9205 970889205 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Analyzed Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Instrument LD # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> IConc Spiked 10pg/L 10Ng/L 10fig/L 30pg/L 60pg/L <br /> Result 68 80 86 25 55 <br /> MS % Recovery 68 80 86 83 92 <br />!ie Dup Result 68 so 86 25 55 <br /> MSD % Recov 68 80 86 83 92 <br /> RPD 00 00 00 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> nn t <br /> LCS# BLK082997 BLK082997 BLK0829974 r <br /> BLK082997 BLK082997 <br /> I Prepared Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Analyzed Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Instrument l.D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc. Spiked 10pg/L 10 fig/L 10pg/L 30pg/L 60pg/L <br /> LCS Result 81 97 10 29 65 <br /> LCS % Recov 81 97 100 97 108 <br /> I <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 /> UOIA ANA I 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 /> and Heding <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 970SE45 EEE <2> <br /> I <br />