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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 (925)988-9600 FAX(925)988-9673 <br /> r� <br /> Analytical <br /> � r 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 'JC� t c1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Blaine Tech Services, Inc Client Project ID Shell 341 East Main St, Ripon <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9902D76 -01 Reported Mar 15, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS0309998260S2A <br /> Analy Method EPA 8260 <br /> Prep Method EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD# 9022379 <br /> Sample Cone N D <br /> Prepared Date 3/9/99 <br /> Analyzed Date 3/9/99 <br /> Instrument l D # GCM52 <br /> Cone Spiked 50pg/L <br /> Result 51 <br /> MS% Recovery 102 <br /> Dup Result 49 <br /> MSD %Recov 98 <br /> RPD 40 <br /> RPD Limit 0-25 <br /> LCS # LCS031099 <br /> Prepared Date 3/10/99 <br /> Analyzed Date 3/10/99 <br /> -' Instrument I D # GCMS2 <br /> Cone Spiked 50Ng/L <br /> LCS Result 49 <br /> LCS %Recov 98 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> Elap#1271 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 It <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 /> 7 <br /> Kaan Ki <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9902D76 BLA <1> <br />