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•+� Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(654)364 9233 <br /> 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Straker Avenue Salic 8 Sacramento, CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 6981, 4855 19 <br /> 3164 Gold Camp Drive, #240 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter Work Order# 9709G57-02 Reported Oct 7, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO93097BTEX17A GC093097BTEX17A GCO93097BTEX17A GC093097BTEX17A GC093097BTEX17A <br /> Anally 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 # 9709B8001 9709BB001 970988001 970968001 9709BB001 <br /> Sample Conc ND ND ND ND ND <br /> Prepared Date 9/30/97 9/30/97 9/30/97 9/30/97 9/30/97 <br /> Analyzed Date 9/30/97 9/30/97 9/30/97 9/30/97 9/30/97 <br /> Instrument l D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10Ng/L 10yg/L 10pg/L 30pg/L 60Ng/L <br /> Result 92 91 91 27 57 <br /> 16S % Recovery 92 91 91 90 95 <br /> Dup Result 96 93 94 28 59 <br /> MSD % Recov 96 93 94 93 98 <br /> RPD 43 22 32 36 34 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK093097 BLK093097 BLK093097 BLK093097 ELK093097 <br /> Prepared Date 9/30/97 9/30/97 9/30/97 9/30/97 9/30/97 <br /> Analyzed Date 9/30/97 9/30/97 9/30/97 9/30/97 9/30/97 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10pg/L 10pg/L 10,ug/L 30,tg/L 60Ng/L <br /> LCS Result 96 98 96 29 60 <br /> LCS % Recov 96 98 96 97 100 <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, interferent4ree matrix that is analyzed using the same reagents, <br />"EQUO 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 is to be used to validate the batch <br /> Gregory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9709G57 GET <2> <br />