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00 O <br /> (D 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 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Gettler Ryan/Geostrategles 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# 9605A58 -04 Reported May 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. GCO52096BTEX20A GCO52096BTEX20A GC052096ETEX20A GCO52096BTEX20A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J Woo J Woo J Woo <br /> MS/MSD # G9605902-02B G9605902-02B G9605902-02B G9605902-02B <br /> Sample Conc : N D N D N D N D <br /> Prepared Date. 5/20/96 5/20/96 5/20/96 5/20/96 <br /> Analyzed Date' 5/20/96 5/20/96 5/20/96 5/20/96 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result. 96 9 4 97 29 <br /> MS % Recovery- 96 94 97 97 <br /> Dup Result 10 10 10 31 <br /> MSD % Recov 100 100 100 103 <br /> RPD 41 62 30 67 <br /> RPD Limit- 0-25 0-25 0-25 0-25 <br /> LCS # GBLK052096A GBLK052096A GBLK052096A GBLK052096A <br /> Prepared Date 5/20/96 5/20/96 5/20/96 5/20/96 <br /> Analyzed Date 5/20/96 5/20/96 5/20/96 5/20/96 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiker! 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Result 98 98 99 30 <br /> LCS % Recov 98 98 99 100 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 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 />. SEQUOIA NALYTICAL 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 /> Mike Gregory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9605A58 GET [27 <br />