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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 Geek,CA 94598 (510) 988 9600 FAX(5 10)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921-OtOO <br /> IWO <br /> v Blaine Tech Services, Inc Client Project ID Shell Stockton /971222-F, <br /> 1680 Rogers Ave Matrix Liquid <br /> v San Jose, CA 95112 <br /> .Attention Fran Thie Work Order# 9712F01-02 Reported Jan 12, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch#: MS123097MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep. Method- NA <br /> Analyst L Duong <br /> MS/MSD#. 9712FO104 <br /> Sample Conc . N D <br /> Prepared Date 12/30/97 <br /> Analyzed Date: 12/30/97 <br /> Instrument I D # H6 <br /> Conc Spiked 50 pg/L <br /> Result 50 <br />�IVIS % Recovery 100 <br /> Dup. Result so <br /> MSD % Recov .. 100 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS #- <br /> Prepared Date- <br /> Analyzed Date: <br /> Instrument LD #- <br /> Conc Spiked <br /> LCS Result: <br /> LCS % Recov. <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 4genner A ANALYTICAL 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 /> Interference,the LCS recovery is to be used to validate the batch <br /> Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9712F01 SLA <2> <br />