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r Sequoia 680 Chesapeake Drive 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 /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916) 921-0100 <br /> ` d4ler'R'*/6eostrategies Client Project ID Unocal 0123/1034'Central Ave' <br /> 6747 Sierra Court, Ste J Matrix Liquid n <br /> ',Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 98031-106-02 Reported Apr 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS033198MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst E Manuel <br /> MS/MSD # 9803HO602 <br /> Sample Conc 39 <br /> Prepared Date - <br /> Analyzed Date 3/31/98 <br /> Instrument I ❑ # F3 <br /> Conc Spiked 50ltg/L <br /> Result. 96 <br /> MS % Recovery 104 <br /> Dup Result. 56 <br /> MSD % Recov 104 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS #• LCSO33198 <br /> Prepared Date - <br /> Analyzed Date 3/31/98 <br /> Instrument I D # F3 <br /> Conc Spiked 50pg/L <br /> LCS Result: 55 <br /> LCS % Recov 110 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limrts <br /> Please Note <br /> The LCS is a control sample of known,interferent4ree matrix that is analyzed using the same reagents, <br /> ;ject <br /> QUOI LYTICAL 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 /> regory <br /> Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD-ReIa#ive%Difference 9803H06 GET <3> <br />