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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)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 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Tosco 6981, 140124 02 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Steve Carter Work Order# 9802153-02 Reported Mar 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO22898BTEX21A GCO228983TEX21A GCO22898BTEX21A GCO22898BTEX21A GCO22898BTEX21A <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 C Demartini C Demartini C Demartini C Demartini C Demartini <br /> MS/MSD # 9802D6006 9802D6006 9802D6006 9802D6006 9802D6006 <br /> Sample Conc N D ND ND ND N D <br /> Prepared Date 2/28/98 2/28/98 2/28/98 2/28/98 2/28/98 <br /> Analyzed Date 2/28/98 2/28/98 2/28/98 2/28/98 2/28/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10pg/L 10Vg/L 10ug/L 30yg/L 60ug/L <br /> Result 10 10 10 30 54 <br /> S % Recovery 100 100 100 100 90 <br /> Dup Result 10 97 97 29 50 <br /> MSD % Recov 100 97 97 97 83 <br /> RPD 00 30 30 34 77 <br /> RPD Limit 0-25 0-25 025 025 0-25 <br /> LCS # BLK022898 BLK022896 BLK022898 BLK022898 BLK022898 <br /> Prepared Date 2/28/98 2/28/98 2/28/98 2/28/98 2/28/98 <br /> Analyzed Date 2/28/98 2/28/98 2/28/98 2/28/98 2/28/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked 10 ug/L 10,ug/L 10,ug/L 30 jig/L 60pg/L <br /> LCS Result 10 9 8 99 29 52 <br /> LCS % Recov 100 98 99 97 87 <br /> MSIMSD 60140 60-140 60140 60-140 60-140 <br /> LCS 70-130 70-130 70130 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 /> QUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> 9 f` 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 /> �!M1 regory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9802153 GET <2> <br />