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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 94548 (925)9$8-9600 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, Inc Client Project ID Shell 2575 Country Club Blvd <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9810742-13, 16-18 Reported Nov 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS101498MTBEH6B <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst B Pitamah <br /> MS/MSD # 981073705 <br /> Sample Conc 36 <br /> Prepared Date 10/14/98 <br /> Analyzed Date 10/14/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50/is/L <br /> Result 77 <br /> MS % Recovery 82 <br /> Dup Result 70 <br /> MSD % Recov 68 <br /> RPD 95 <br /> RPD Limit 0-25 <br /> LCS # LCS101698 <br /> Prepared Date 10/16/98 <br /> Analyzed Date 10/16/98 <br /> Instrument 1 D # H6 <br /> Conc Spiked 50Ng/L <br /> LCS Result 41 <br /> LCS % Recov 82 <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 /> S A NALYTICAL 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 /> m nce,the LCS recovery is to be used to validate the batch <br /> P ggy enner <br /> Pr ject anagen **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9810737 BLA <5> <br /> 6D <br />