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4) <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 96W FAX(650)364 9233 <br /> ,!XN 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker 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 v ry <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803523-04 Reported Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Sulfate <br /> GC Batch# IND311983000A <br /> Analy Method EPA 300 0 <br /> Prep Method N A <br /> Analyst J Hills <br /> MS/MSD# 980322901 <br /> Sample Cone 17 <br /> Prepared Date 3/11/98 <br /> Analyzed Date 3/11/98 <br /> Instrument I D # INIC1 <br /> Cone Spiked 10 mg/L <br /> Result 28 <br /> 41 S % Recovery 110 <br /> Dup Result 27 <br /> MSD % Recov 100 <br /> RPD 36 <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 /> Cone Spiked 10 mg/L <br /> LCS Result 10 <br /> LCS % Recov 100 <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 /> loMat <br /> QUOIA A ALYTICAL preparation,and analytical methods employed for the samples The matrix spike is art aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure tf <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 /> oryna9er **MS=Matrix Spike,MSD=MS Duplicate,FWD=Relative%Difference 9803523 GET <13> <br />