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f� Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 rAX(415) 364 9233 <br /> 404 N W,gct Lanc Walnut Crcck CA 94598 (510) 988 9600 1AX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID` ` Unocal 7855 20 N <br /> `'3164 Gold Camp Drive #240 Matrix Liquid <br /> ,Rancho Cordova, CA 95670 r <br /> ' Attention Greg Gurss Work Order# 9705G03 -01, 02 Reporter! ,tun 9, 19971 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO60297BTEX17A GCO60297BTEX17A GCO60297STEX17A GCO60297BTEX17A GCO602973TEX17A <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# 9705A6804 9705A6804 9705A6804 9705A6804 9705AS804 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 6/2/97 6/2/97 6/2/97 6/2/97 6/2/97 <br /> Analyzed Date 6/2/97 6/2/97 6/2/97 6/2/97 6/2/97 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10pg/L 10pg/L 10pg/L 30pg/L 60pg/L <br /> Result 99 99 10 30 61 <br /> 4 % Recovery 99 99 100 100 102 <br /> Dup Result 97 97 97 29 60 <br /> MSD % Recov 97 97 97 97 100 <br /> RPD 20 20 30 34 17 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK060297 BLK060297 BLK060297 BLK060297 BLK060297 <br /> Prepared Date 6/2/97 6/2/97 6/2/97 6/2/97 6/2/97 <br /> Analyzed Date 6/2/97 6/2/97 6/2/97 6/2/97 6/2/97 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone. Spiked 10pg/L long/L 10pg/L 30pg/L 60pg/L <br /> LCS Result 95 95 94 29 59 <br /> LCS % Recov 95 95 94 97 98 <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 /> " Fregory UOIA 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 /> nterference,the LCS recovery is to be used to validate the batch <br /> ik <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9705G03 GET <1> <br />