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Sequoia 680 Chesapeake Dave 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 /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1%W Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792 1865 FAX(707)792-0342 <br /> 10 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-2033 /980521-L1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9805E75-02, 03 Reported Jun 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# M5052898MTSEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst E Manuel <br /> MS/MSD# 980592814 <br /> Sample Cone . 16 <br /> Prepared Date NA <br /> Analyzed Date 5/28/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50ug/L <br /> Result 69 <br /> S % Recovery 106 <br /> Dup Result 68 <br /> MSD % Recov 104 <br /> RPD 15 <br /> RPD Limit 0-25 <br /> LCS# LCS052898 <br /> Prepared Date NA <br /> Analyzed Date 5/28/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50 pg/L <br /> LCS Result 55 _ <br /> LCS % Recov 110 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Nate <br /> The LCS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents, <br /> EOUOI A 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 /> / <br /> � interference,the LCS recovery is to be used to validate the batch <br /> / ikgory e <br /> Ifo Gt Manager **MS-Matrix Spike, MSO=MS Duplicate, RPC=Relative% Difference 9805E75 BLA <3> <br />