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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> frlllf Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 4855 20 /5981, Stockton <br /> 3164 Gold Camp Drive #240 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Greg Gurss Work Order# 970BF33 -01, 02 Reported Sep 5, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO82997BTEX21A GCO82997BTEX21A GCO82997BTEX21A GCO82997BTEX21A GCO82997BTEX21A <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 J1rsa D J1rsa D Jrrsa D Jrrsa D Jirsa <br /> MS/MSD # 9708137105 970SC7105 970SC7105 9708C7105 9708C7105 <br /> Sample Cone - N D N D N D N D N D <br /> Prepared Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Analyzed Date- 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Instrument I D #. GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10 ug/L 10 ug/L 10 ng/L 30 ug/L 60 ug/L <br /> Result 10 10 10 30 53 <br /> MS % Recovery 100 100 100 100 88 <br /> 1 0 Dep Result 98 96 95 28 50 <br /> MSD % Recov 98 96 95 93 83 <br /> RPD 20 41 51 69 58 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK082997 BLK082997 BLK082997 BLK082997 BLK082997 <br /> Prepared Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Analyzed Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10pg/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> LCS Result 95 94 93 28 49 <br /> LCS % Recov 95 94 93 93 82 <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 /> EQUO LYTICAL 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 /> regory <br /> oject Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9708F33 GET <1> <br />