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i <br /> v 4 Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Credo,CA 94598 (510) 988 9600 FAX(510)986-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategles Client Project ID Unocal 0123%1034 Central Ave <br /> `x6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> ,Attention Deanna Harding Work Order# 9803H06-02-05 Reported Apr 13+ 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Diesel <br /> QC Batch# GCO327980HBPEXB <br /> Analy Method EPA 8015M <br /> Prep Method EPA 3510 <br /> Analyst A Porter <br /> BS/BSD # BLK032798 <br /> Sample Conc N D <br /> Prepared Date 3/27/98 <br /> Analyzed Date 3/31/98 <br /> Instrument I D # GCHP19 <br /> Conc Spiked 1000pg/L <br /> Result 800 <br /> BS % Recovery 80 <br /> Dup Result Iso <br /> BSD % Recov 78 <br /> RPD 25 <br /> RPD Limit 0-50 <br /> LCS # <br /> Prepared Date <br /> Analyzed Date <br /> Instrument I D # <br /> Conc. Spiked <br /> LCS Result <br /> LCS % Recov <br /> 50-150 <br /> LCS 60-140 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA A YTICAL 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 /> gory <br /> P t Ma ger *'MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 98031-106 GET <6> <br />