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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) 92t 0100 <br /> Gettler Ryan/Geostrate les Client Project ID Chevron 9-6171 t <br /> g ) , Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9605A58 -01 -03, 05-07 Reported May 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC052096STEX21A GC0520968TEX2IA GC052096BTEX2IA GC0520968TEX2IA <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 G9605902-026 G9605902-02B <br /> Sample Cone N D N D N D N D <br /> Prepared Date: 5/20/96 5/20/96 5/20/96 5/20/96 <br /> Analyzes! Date- 5/20/96 5/20/96 5/20/96 5/20/96 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result. 11 12 13 38 <br /> MS % Recovery 110 120 130 127 <br /> Dap Result. 12 12 13 39 <br /> MSD % Recov : 120 120 130 130 <br /> RPD 87 00 00 26 <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 5/20/95 5/20/96 <br /> Instrument i D #' GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Result 11 12 12 38 <br /> LCS % Recov 110 120 120 127 <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 A ALYT]CAL 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 enure analytical procedure if <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Mike Gregory Interference,the LCS recovery is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9605A58 GET <1> <br />