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680 Chesapeake Drive Redwood CRY CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services, [no Client Project ID Shell 2575 Country Club Blvd <br /> 1680 Rogers Ave Matrix Liquid <br /> wSan JoseFCA=95112 <br /> Attention Fran Thie Work Order# 9810743-24 Reported Nov 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS102298MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst L Duong <br /> MS/MSD # 981OD8003 <br /> Sample Conc N D <br /> Prepared Date 10/22/98 <br /> Analyzed Date 10/22/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 pg/L <br /> Result 43 <br /> MS % Recovery 86 is <br /> Dup Result 41 <br /> MSD % Recov 82 <br /> RPD 48 <br /> RPD Limit 0-25 <br /> LCS # LCS102298 <br /> Prepared Date 10/22/98 <br /> Analyzed Date 10/22/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50pg/L <br /> LCS Result 42 <br /> LCS % Recov 84 <br /> 60-140 <br /> LCS 70-130 <br /> Control imits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents <br /> J1A LYTIC preparation,and analytical methods employed for the samples The matrix spike is an aliquot of samplertified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> t e recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> i terference,the LCS recovery is to be used to validate the batch <br /> enner <br /> anager **MS=Matrix Spike, MSD=MSiQiphcate, RPD=Relative% Difference 9810737 BLA <9> <br />