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a— ) <br /> 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wiger Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical 814 Striker Avenue Suite B 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)79 2-0342 <br /> f <br /> Blaine Tech Services, Inc Client Project ID Shell 2575 Country Club Blvd <br /> 1680 Rogers Ave Matrix Liquid <br /> San,lose, CA 95112 <br /> Attention Fran Thie Work Order# 9807H89-19, 21-22, 24 Reported Aug 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. MTBE <br /> QC Batch# MG080698MTBEH68 <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst. L Duong <br /> MS/MSD# 9807H8920 <br /> Sample Conc ND <br /> Prepared Date 8/6/98 <br /> Analyzed Date 8/6/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50ug/L <br /> Result 45 <br /> MS % Recovery 90 <br /> Dup Result 46 <br /> MSD % Recov 92 <br /> RPD 22 <br /> RPD Limit. 0-25 <br /> LCS# LC5080698 <br /> Prepared Date 8/6/98 <br /> Analyzed Date 8/6/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 jig/L <br /> LCS Result 45 <br /> LCS % Recov 90 <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 />�SEQU ALLYTICAL 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 /> t ecovery 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 /> P ggy nner <br /> P ole t Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9807H87 BLA <7> <br />