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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 1q) 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)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, 03, 05, 06 Reported Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Sulfate <br /> QC Batch# IN0312983000ACA <br /> Analy Method EPA 300 0 <br /> Prep Method N A. <br /> Analyst ,1 Hills <br /> MS/MSD# 980369104 <br /> Sample Cone 10 <br /> Prepared Date 3/12/98 <br /> Analyzed Date 3/13/98 <br /> Instrument I D # INIC1 <br /> Conc Spiked 1 0 mg/L <br /> Result 11 <br /> �S% Recovery 100 <br /> Dup Result 12 <br /> MSD % Recov 110 <br /> RPD 87 <br /> RPD Limit 0-20 <br /> LCS # LCS031298 <br /> Prepared Date 3/12/98 <br /> Analyzed Date 3/13/98 <br /> Instrument I D # INIC1 <br /> Cone Spiked 10 mg/L <br /> LCS Result- 11 <br /> LCS % Recov 110 <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 /> VJect <br /> GtUOIA ANALYTICAL 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 fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> ory <br /> nager *'MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9803523 GET <11> <br />