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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> S3 <br /> q 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> 619 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Analytical <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 Martmg Work Order# 9711732 03, 04, 05 Reported Dec 9, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GC112497STEX02A GC112497BTEX02A GC112497STEX02A GC112497STEX02A GC112497STEX02A <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 Miraftab A Miraftab A Miraftab A Miraftab A Miraftab <br /> MS/MSD # 9711C1804 9711C1804 9711C1804 971101804 9711C1804 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 11/24/97 11/24/97 11/24/97 11/24/97 11/24/97 <br /> Analyzed Date 11/24/97 11/24/97 11/24/97 11/24/97 11/24/97 <br /> Instrument I ❑ # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10 pg/L 10,ug/L 10 ug/L 30 ug/L 60 pg/L <br /> Result 11 10 10 32 73 <br /> MS % Recovery 110 100 100 107 122 <br /> Dup Result 10 10 10 31 71 <br /> MSD % Recov 100 100 100 103 118 <br /> RPD 95 00 00 32 28 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> a <br /> LCS# BLK112497 BLK112497 BLK112497 BLK112497 BLK112497 <br /> Prepared Date 11/24/97 11/24/97 11/24/97 11/24/97 11/24/97 <br /> Analyzed Date 11/24/97 11/24/97 11/24/97 11/24/97 11/24/97 <br /> Instrument I D# GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10 ug/L 10 pg/L 10lig/L 30 ug/L 60 pg/L <br /> LCS Result 11 10 10 31 72 <br /> LCS % Recov 110 100 100 103 120 <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 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 /> Y interference,the LCS recovery 1s to be used to validate the batch <br /> Richard He g <br /> Project Man ger **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative A Difference 9711732 EEE <2> <br /> 9D <br />