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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> a- ) 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> qwr 1455 McDowell Blvd Horth 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 Thle Work Order# 9810743-19-23 Reported Nov 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS101698MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst B Pitamah <br /> MS/MSD # 981074218 <br /> Sample Conc N D <br /> Prepared Date 10/16/98 <br /> Analyzed Date 10/16/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 ug/L <br /> Result 46 <br /> MS % Recovery 92 <br /> Dup Result 49 II <br /> MSD % Recov 98 <br /> RPD 63 <br /> RPD Limit 0-25 <br /> LCS # LCS101698 <br /> Prepared Date 10/16/98 <br /> Analyzed Date 10/16/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50Mg/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 /> 0;(er <br /> ALYTICAL 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 re ery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> rference,the LCS recovery is to be used to validate the batch <br /> ager *"MS= <br /> Spike, MSD=MS Duplicate, RPD=Relative% Difference 9810737 BLA <8> <br />