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Y <br /> Ci) Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95934 (916) 921 9600 FAX(916)921 0104 <br /> 0 <br /> Gettler Ryan/Geostrategies Client Project ID Chevron 9-6171, Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9707637 -01, 02, 04-07 Reported Aug 4, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xyienes Gas <br /> Benzene <br /> QC Batch# GCO724973TEX03A GCO72497BTEX03A GC072497BTEX03A GC072497BTEX03A GCO72497BTEX03A <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 /> i <br /> Analyst D Jlrsa D J1rsa D J1rsa D J1rsa D Jima <br /> MS/MSD #: 9707A28m 9707A2805 9707A2805 9707A2805 9707A2805 <br /> Sample Cork . N D N D N D N D N D <br /> Prepared Date: 7/24/97 7/24/97 7/24/977 7/24/97 7/24/97 <br /> Analyzed Date: 7/24/97 7/24/97 7/24/97 7/24/97 7/24/97 <br /> Instrument I D #: GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc. Spiked 10ug/L 10ug/L 10fug/L 30ug/L 60ug/L <br /> Result 91 90 91 25 72 <br /> S % Recovery 91 90 91 83 120 <br /> Dup Result 84 83 84 24 45 <br /> MSD % Recov 84 83 84 80 75 <br /> RPD 80 81 80 41 46 <br /> RPD Limit. 0-25 0-25 0-25 0-25 0-25 <br /> LCS #: BLK072497 BLK072497 ELK072497 BLK072497 BLK072497 <br /> Prepared Date 7/24/97 7/24/97 7/24/97 7/24/97 7/24/97 <br /> Analyzed Date- 7/24/97 7/24/97 7/24/97 7/24/97 7/24/97 <br /> Instrument I D.# GCHP3 GCHP3 GCHP3 GCHP3 GCHP3 <br /> Conc Spiked. long/L 10ug/L 10 fig/L 30ug/L 60 fug/L <br /> LCS Result. 88 87 88 24 69 <br /> LCS % Recov : 88 87 88 80 115 <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 1s a control sample of known,Interferent-free matrix that 1s analyzed using the same reagents, <br /> �QUOIAALYT AL 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 /> egory <br /> Project Manager **MS=Matrix Spike, MSD-MS Duplicate, RPD=Relative%Difference 9707B37 GET <1> <br />