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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 %73 <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 5421, 180139 85 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9806E56 01, 02 Reported Jul 2, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. MTBE <br /> QC Batch# MS061898MTBEF2A <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst M Williams <br /> MS/MSD# 980681603 <br /> Sample Cone.. N D <br /> Prepared Date- 6/18/98 <br /> Analyzed Date 6/18/98 <br /> Instrument I D # F2 <br /> Cone Spiked 50ug/L <br /> Result 51 <br />. MS % Recovery 102 <br /> Dup Result 47 <br /> MSD % Recov 94 <br /> RPD. 82 <br /> RPD Limit 0-25 <br /> LCS# LCS062398 <br /> Prepared Date 6/23/98 <br /> Analyzed Date. 6/23/98 <br /> Instrument I D # F2 <br /> Cone Spiked 50pg/L <br /> LCS Result. 55 <br /> LCS % Recov - 110 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s 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 /> Tod Granlcher interference,the LCS recovery is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 98061"56 GET <1> <br />