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. - \ Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 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 7-3942, 51539 42 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9708E46-20, 21 Reported Sep 11, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xytenes Gas <br /> Benzene <br /> QC Batch# GCO82997BTEX06A GC082997BTEX06A GC082997BTEX06A GCO82997BTEX06A GCO82997STEX06A <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 970889205 9708B9205 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 I D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br />' Conc Spiked 10Ng/L 10ug/L 10yg/L 30Ng/L 60ug/L <br /> Result 68 80 86 25 55 <br /> MS % Recovery 68 80 86 83 92 <br /> Dup Result 68 80 85 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 /> l h J r <br /> LCS # BLK082997 BLK082997 BLK082997 BLK082997 BLK082997 <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 />' Conc Spilled 10 pg/L 10lig/L 10 Yg/L 30 Ng/L 60 pg/L <br /> LCS Result 81 9 7 10 29 65 <br /> LCS % Recov • 81 97 100 97 108 <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 /> 1;p�S701JAALYT AL 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 /> Richard Herling <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPO=Relative%Difference 9708E45 EEE <8> <br />