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r <br /> Sequoia 680 Chesapeake Dnve Redwood City, CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> fri11>� Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 96W FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal SS#0187, 280045 85 N <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order # 9803523-06 Reported Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Nitrate <br /> QC Batch# IN0312983000ACA <br /> Analy Method EPA 300 0 <br /> Prep Method N A <br /> Analyst J Hills <br /> MS/MSD # 980369104 <br /> Sample Conc 039 <br /> Prepared Date 3/12/98 <br /> Analyzed Date 3/13/98 <br /> Instrument 10 # INIC1 <br /> Conc Spiked 1 0 mg/L <br /> Result 13 <br /> op % Recovery 91 <br /> Dup Result 13 <br /> MSD % Recov 91 <br /> RPD 00 <br /> RPD Limit 0-20 <br /> LCS # LCS031298 <br /> Prepared Date 3/12/98 <br /> Analyzed Date 3/13/98 <br /> Instrument l D # INIC1 <br /> Conc Spiked 10 mg/L <br /> LCS Result 95 <br /> LCS % Recov 95 <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 is analyzed using the same reagents, <br /> �QUOIA AN ICAL 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 /> e ry <br /> roj ct anager **MS=Matrix Spike MSD=MS Duplicate, RPD=Relative%Difference 9803523 GET <10> <br /> 0d' <br />