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Sequoia0 Chesapeake Drive Redwood Cary CA 94063 50) 364 96W FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal SS#4187 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9802A45-02, 09 Reported Mar 3, 1998 <br /> xrvl. srv-`3 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO22698802004A GCO22698802004A GCO22698802004A GCO22698802004A GCO22699802004A <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 Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 8021496 8021496 8021496 8021496 8021496 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 2/26/98 2/26/98 2/26/98 2/26/98 2/26/98 <br /> Analyzed Date 2/26/98 2/26/98 2/26/98 2/26/98 2/26/98 <br /> Instrument I D # HP4 HP4 HP4 HP4 HP4 <br /> Cone. Spiked 20 pg/L 20 pg/L 20 pg/L 60 pg/L 300 pg/L <br /> Result 19 20 19 59 260 <br /> S%Recovery 95 100 95 98 87 <br /> Dup Result 19 19 18 57 260 <br /> MSD % Recon 95 95 90 95 87 <br /> RPD 00 51 54 34 00 <br /> RPD Limit 0-20 0.20 0-20 0-20 0-50 <br /> LCS. # LCSOM98 LCS022698 LCS022698 LCS022698 LCS022698 <br /> Prepared Date 2/26/98 2/26/98 2/26/98 2/26/98 2/26/98 <br /> Analyzed Date 2/26/98 2/26/98 2/26/98 2/26/98 2/26/98 <br /> Instrument I.D # HP4 HP4 HP4 HP4 HP4 <br /> Cone Spiked 20 pg/L 20 pg/L 20 pg/L 60 pg/L 300 pg/L <br /> LCS Result 18 18 18 54 260 <br /> LCS% Recov 90 90 90 90 87 <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 /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> ap#1 % 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 /> 0 'e <br /> 7 <br /> egory <br /> rcject Manager MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9802A45 GET <2> <br /> ,91�, <br />