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Sequoia 680 Chesapeake, Drivc Redwood City, CA 94063 (650) 364 9600 1 A(65 0)364 9233 <br /> 404N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Su,tc 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> ,­Gettler Ryan/Geostrategies Client Project ID Chevron 9-i848, Manteca <br /> 3164 Gold Camp Drive, #240 Matrix Liquid <br /> ',Rancho Cordova, CA 95670 <br /> 'Attention Greg Gurss Work Order# 9709993-09-12 Reported Sep 26, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC091997BTEX03A GC091997BTEX03A GCO91997BTEX03A GCO91997BTEX03A GCO91997BTEX03A <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 # 970977701 970977701 970977701 970977701 970977701 <br /> Sample Conc. N D N D ND ND N D <br /> Prepared Date 9/19/97 9/19/97 9/19/97 9/19/97 9/19/97 <br /> Analyzed Date 9/19/97 9/19/97 9/19/97 9/19/97 9/19/97 <br /> Instrument LD #, GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10ug/L 10ug/L 10os/L 30ug/L 60u9/L <br /> Result 96 94 95 26 <br /> OMS % Recovery. 96 94 95 87 16 2 <br /> Dup Result 99 97 97 27 69 <br /> MSD % Recov. 99 97 97 90 115 <br /> RPD' 31 31 21 38 29 <br /> RPD Limit. 0-25 0-25 0-25 0-25 0-25 <br /> LCS#. BLK091997 BLK091997 BLK091997 SLK091997 BLK091997 <br /> Prepared Date: 9/19/97 9/19/97 9/19/97 9/19/97 9/19/97 <br /> Analyzed Date 9/19/97 9/19/97 9/19/97 9/19/97 9/19/97 <br /> Instrument LD#. GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked 10ug/L 10pg/L 10ug/L 30ug/L 60ug/L <br /> LCS Result 10 99 9 9 28 70 <br /> LCS % Recov.: 100 99 99 93 117 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70130 70130 <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 /> �EQUC ALYTICAL 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 1s to be used to validate the batch <br /> Wecto <br /> ory <br /> nager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9709993 GET c2> <br />