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, <br /> 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 /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)9ZI-9600 FAX(916)921-0100 <br /> Iwo- Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792 0342 <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 Thie Work Order # 9805E75-01 Reported Jun 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS052698MTBEH6B <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD # 9805E4116 <br /> Sample Cone 31 <br /> Prepared Date N A <br /> Analyzed Date 5/26/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50 jug/L <br /> Result 54 <br /> 4VS % Recovery 102 <br /> Dup Result 56 <br /> MSD % Recov los <br /> RPD 36 <br /> RPD Limit 0-25 <br /> LCS # LOS052698 <br /> Prepared Date N A <br /> Analyzed Date 5/26/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50pg/L <br /> LCS Result 49 <br /> LCS % Recov 98 <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 /> i/xro/iectManager <br /> AL"CAL 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 /> y <br /> **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9805E75 BLA <2> <br />