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40 <br /> Sequoia 0 Chesapeake Drive Redwood elk. CA 94 (650)364-9600 FAX(650)364-9133 <br /> 404 N Wiget lane Walnut Creek CA 9459898 (9Z5)988-9600 FAX(915)9$8-9673 <br /> 819 5trlker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> qqW Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industnal Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> nvironmental Resolutions Client Project ID Unocal 5098/227903 <br /> 74 Digital Drive, Ste 6 Matrix Solid <br /> Novato, CA 94949 <br /> Attention Mark Dockum Work Order# 9901 E97 01, 02 Reported Mar 26, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> OC Batch# sPo2o499826oExA <br /> Analy Method EPA82M <br /> Prep Method EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD# 9020454 <br /> Sample Conc 7400 <br /> Prepared Date 2/4/99 <br /> Analyzed Date 2/4/99 <br /> Instrument I D # GCMS2 <br /> Conc Spiked 250opg/Kg <br /> Result 9600 <br /> MS % Recovery 88 <br /> Dup Result 9600 <br /> MSD % Recov 88 <br /> ' RPD 00 <br /> RPD Limit 0-25 <br /> LCS # Lcs020499 <br /> Prepared Date 2/4/99 <br /> Analyzed Date 2/4/99 <br /> Instrument I D # GCMS2 <br /> ' Conc Spiked 2500 Pg/Kg <br /> LCS Result 2400 <br /> LCS %Recov 96 <br /> ?M� <br /> B0-140 <br /> LCS 70-130 <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 /> SEQUOIA 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 fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> wt-Mei S�!n <br /> Project KCanager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference RE=PORT Xl 5 <2� <br /> Q <br />