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' 680 Chesapeake Drive Redwood Qty,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX(916) 921 0100 <br /> Analytical <br /> Gettler Ryan/Geostrategies Client Project 1D Unocal 7855 20 <br /> 3164 Gold Camp Drive #240 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Greg Gurss Work Order# 9708032 -01. 02 Reported Aug 5, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC080197BTEX21A GC080197BTEX21A GCO80197BTEX21A GC080197BTEX21A GCO80197BTEX21A <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 D Jirsa D Jirsa D Jirsa D Jirsa D Jirsa <br /> MS/MSD # 9707C2206 9707C2206 9707C2206 970702206 9707132206 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 8/1/97 8/1/97 8/1/97 8/1/97 8/1/97 <br /> Analyzed Date 8/1/97 8/1/97 8/1/97 8/1/97 8/1/97 <br /> instrument 1 D #- GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10pg/L 10pg/L 10pg/L 30pg/L 60p9/L <br /> Result 96 96 97 29 53 <br /> MS % Recovery 96 96 97 97 88 <br /> r. Dup Result 97 99 99 29 54 <br /> MSD %Recov 97 99 99 97 90 <br /> RPD 10 31 20 00 19 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK080197 BLK080197 BLK080197 BLK080197 BLK080197 <br /> Prepared Date 8/1/97 8/1/97 8/1/97 8/1/97 8/1/97 <br /> Analyzed Date 8/1/97 8/1/97 8/1/97 8/1/97 8/1/97 <br /> instrument 1 D # GCHP21 GCHP21 GCHP21 GCHP21 CCHP21 <br /> Cone Spiked: 10p9/L 10pg/L 10pg/L 30119/L 60pg/L <br /> LCS Result. 96 97 97 29 53 <br /> LCS %Recov 96 97 97 97 88 <br /> Mb 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 /> EQUOIAALYTICAL 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 /> j 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 /> e Gregory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative°6 Difference 9708032 GET 1 <br />