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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 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-f865 FAX (707)792-0342 <br /> Gettler Ryan/Geostrategies Client Project ID Former Unocal #5421 <br /> 6747 Sierra Court, Ste J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine Work Order# 9804A15 -01-07 Reported Apr 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MSO41698MTBEEXA <br /> Analy. Method EPA 8260 <br /> Prep Method NA <br /> Analyst- M Williams <br /> MS/MSD# 9804A1501 <br /> Sample Conc ND <br /> Prepared Date 4/16/98 <br /> Analyzed Date 4/21/98 <br /> Instrument I D # H6 <br /> Conc Spiked 2500pg/Kg <br /> Result 2000 <br /> MS % Recovery 80 <br /> Dup Result 1900 <br /> MSD % Recov 76 <br /> RPD 51 <br /> RPD Limit 0-25 <br /> LCS # LCSO42198 <br /> Prepared Date 4/21/98 <br /> Analyzed Date 4/21/98 <br /> Instrument I D # H6 <br /> Conc Spiked 2500ug/Kg <br /> LCS Result 2000 <br /> LCS % Recov 80 <br /> 60-140 <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 /> SEQUOA NALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> Woject <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 /> aryinterference,the LCS recovery is to be used to validate the batch <br /> nager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9804A15 GET <1> <br />