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Sequoia 680 Chesapeake Drive Redwood Cary 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 /> low 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792 0342 <br /> 0 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 5421, Stockton <br /> 6747 Sierra Court, Ste J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine Work Order# 9804A13 -01-05 Reported May 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MSO41698MTBEEXA <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst M Williams <br /> MS/MSD # 9804A1501 <br /> Sample Cone N D <br /> Prepared Date 4/16/98 <br /> Analyzed Date 4/21/98 <br /> Instrument I D # H6 <br /> Cone Spiked 2500 Ng/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 /> Cone Spiked 2500 Ng/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 /> SEQUOI AN 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 /> i 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 /> 101 egory <br /> Pro ct Manager **MS Matrix Spike,MSD NIS Duplicate, RPD Relative%Difference 9804A13 GET e 1 a <br />