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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 (925)988-%00 FAX(9Z5)988-9673 <br /> 1a) <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)79Z-0342 <br /> Blaine Tech Services, Inc Client Project ID Shell 6131 Pacific Ave <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order # 9807H83-05-06, -08-09 Reported Aug 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS073198MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst L Zhu <br /> MS/MSD # 98071-17004 <br /> Sample Cone N D <br /> Prepared Date 7/31/98 <br /> Analyzed Date. 7/31/98 <br /> Instrument I D #: las <br /> Cone Spiked 50Ng/L <br /> Result 52 <br /> MS %, Recovery 104 <br /> iDup Result 53 <br /> MSD % Recov 106 <br /> RPD 19 <br /> RPD Limit 0-25 <br /> LCS # BLK073198B <br /> Prepared Date. 7/31/98 <br /> Analyzed Date- 7/31/98 <br /> Instrument I D #- H6 <br /> Cone. Spiked. 50ug/L <br /> LCS Result 54 <br /> LCS % Recov 108 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> leggThe LCS is a control sample of known,ante„erent`ree mamA that is analyzed using the same reagents, <br /> ANALYTICAL 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 /> nner <br /> anager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9807H83 HLA <2> <br />