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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 94598 (510) 988 9600 FAX(510)988 9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX (916)971.0100 <br /> Analytical <br /> ,Blaine Tech Services, Inc Client Project ID Shell Stockton /970805-S1 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9708341-01, 02 Reported Aug 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> OC Batch# MS081297MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A. <br /> Analyst M Williams <br /> MS/MSD # 970819601 <br /> Sample Conc N D <br /> Prepared Date 8/12/97 <br /> Analyzed Date 8/12/97 <br /> Instrument LD # H6 <br /> Conc Spiked. 50 jug/L <br /> Result 52 <br /> MS % Recovery 104 <br /> i <br /> Dup Result 52 <br /> MSD % Recon 104 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> .- <br /> LCS #. VMB081297 <br /> Prepared Date 8/12/97 <br /> Analyzed Date 8/12/97 <br /> Instrument I D # H6 <br /> Conc Spiked 50ug/L <br /> LCS Result 51 <br /> LCS % Recov 102 <br /> fi0-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known, interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA 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 <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to math <br /> "i interference,the LCS recovery is to be used to validate the batch <br /> Peggy Penner <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9708341 BLA <4> <br />