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Sequoia680 Chesapeake Drive 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 /> JW ,,,� 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# 9708E45-14 Reported Sep 11, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO902978TEX06A GC090297BTEX06A GC090297BTEX06A GCO90297BTEX06A GCO902978TEX06A <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. Porter A Porter A Porter A Porter A Porter <br /> MS/MSD# 970807801 9708D7801 9708D7801 9708D7801 9708D7801 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 9/2/97 9/2/97 9/2/97 9/2/97 9/2/97 <br /> Analyzed Date 9/2/97 9/2/97 9/2/97 9/2/97 9/2/97 <br /> Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc Spiked 10ug/L 10ug/L 10pg/L 30ug/L 60pg/L <br /> Result 85 89 87 25 58 <br /> MS % Recovery 85 89 87 83 97 <br /> Dup Result 89 92 91 27 61 <br /> MSD % Recov 89 92 91 90 102 <br /> RPD 46 33 45 77 50 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK090297 BLK090297 BLK090297 BLK090297 BLK090297 <br /> Prepared Date 9/2/97 9/2/97 9/2/97 9/2/97 9/2/97 <br /> Analyzed Date 9/2/97 9/2/97 9/2/97 9/2/97 9/2/97 <br /> Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> IConc Spiked 10Ng/L 10pg/L 10Ng/L 30ug/L 60pg/L <br /> LCS Result s o 93 92 27 61 <br /> LCS % Recov 90 93 92 90 102 <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 /> EQUOIA AN YTICAL 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, RPD=Relative%Difference 970SE45 EEE <7> <br /> Ica <br />