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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9333 <br /> 11) 404 N Wiget Lane Walnut Creek CA 94598 (510) 988-9600 FAX(5 t0)988 %73 <br /> fall' Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal SS#0187, 280045 85 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803523-02-05 Reported Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Nitrate <br /> QC Batch# IN0311983000A <br /> Analy Method EPA 300 0 <br /> Prep Method N A <br /> Analyst J Hills <br /> MS/MSD # 980322901 <br /> Sample Conc 30 <br /> Prepared Date 3/11/98 <br /> Analyzed Date 3/11/98 <br /> Instrument I D # INIC1 <br /> Conc Spiked 10 mg/L <br /> Result 38 <br /> 4F % Recovery 80 <br /> Dup Result 39 <br /> MSD % Recov 90 <br /> RPD 26 <br /> RPD Limit 0-20 <br /> LCS # LCS031198 <br /> Prepared Date 3/11/98 <br /> Analyzed Date 3/11/98 <br /> Instrument I D # INIC1 <br /> Conc Spiked 10 mg/L <br /> LCS Result 94 <br /> LCS % Recov 94 <br /> 75-125 <br /> LCS 80-120 <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 /> V4c <br /> QUOIA7LYTICAL 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 /> rynager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9803523 GET <12> <br />