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r - ■ Sequoia680 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 /> �ri0 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 Chnsta Marting Work Order# 9708E45-11, 12 Reported Sep 11, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO90297BTEX18A GCO90297BTEX18A GCO90297EITEX18A GCO90297BTEX18A GCO90297BTEX18A <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 # 9708D7802 9708D7802 9708D7802 970807802 970807802 <br /> Sample Cone 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 # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> COnc Spiked long/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> Result 99 99 98 31 60 <br /> MS % Recovery 99 99 98 103 100 <br /> Dup Result 96 97 96 31 59 <br /> MSD % Recov 96 97 96 103 98 <br /> RPD 31 20 21 00 17 <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 # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Cone Spiked 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> LCS Result 10 10 10 32 63 <br /> LCS % Recov 100 100 100 107 105 <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 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 9708E45 EEE <6> <br />