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a- ) Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek.CA 9459$ (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 1 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# 9810741-08-11 Reported Nov 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS101496MTBEH6B <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 50ug/L <br /> Result 77 <br /> MS % Recovery 82 <br /> Dup Result 70 <br /> MSD % Recov 68 <br /> RPD 95 <br /> RPD Limit 025 <br /> I <br /> LCS # LCS101498 <br /> Prepared Date 10/14/98 <br /> Analyzed Date 10/14/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50jug/L <br /> LCS Result 44 <br /> LCS % Recov 88 <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 /> A ALYTICAL prepar ion,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 /> PoennerPManager **NIS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9810737 SLA <4> <br />