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Sequoia b80 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-'1865 FAX(707)792-0342 <br /> Blaine Tech Services, Inc Client Project ID Shell 1071 N Main St <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 - - <br /> Attention Fran Thle Work Order# 9804175-01-05 Reported May 18, 1998 <br /> OUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> OC Batch# MS050698826OS2A <br /> Analy Method EPA 8260 <br /> Prep Method- EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD # 8041965 " <br /> Sample Cone N D <br /> Prepared Date 5/6/98 <br /> Analyzed Date 5/6/98 - <br /> Instrument I D # GCMS2 <br /> Cone Spiked 5opg/L <br /> Result 52 <br /> MS % Recovery 104 - <br /> Dup Result 51 . <br /> MSD % Recov 102 <br /> RPD 19 <br /> RPD Limit 025 - - - - <br /> LCS# LCS050698 <br /> Prepared Date 5/6/98 <br /> Analyzed Date 5/6/98 <br /> Instrument 1 D # GCMS2 <br /> Cone Spiked 50ug/L <br /> LCS Result -53 <br /> LCS % Recov 106 <br /> 60-140 <br /> LCS 65-135 <br /> Control Limits <br /> Please Note <br /> SS I tLYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> E 1 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 /> eggy �inner <br /> P �f Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference y 9804175 BLA <4> <br />