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fr <br /> Sequoia r� 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-%00 FAX(925)988-9673 <br /> Analytical <br /> Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 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# 9902163 -01 Reported Feb 23, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS0216998260S2A <br /> Analy Method: EPA 8260 <br /> Prep Method EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD# 9020439 <br /> Sample Cone N D <br /> Prepared Date 2/16/99 <br /> Analyzed Date 2/16/99 <br /> Instrument 1.13# GCMS2 <br /> Cone Spiked 50pg/L <br /> Result 46 <br /> MS %Recovery 92 <br /> Dup, Result 49 <br /> MSD %Recov 98 <br /> RPD- 63 <br /> RPD Limit 0-25 <br /> LCS# LCS021699 <br /> Prepared Date 2/16/99 <br /> Analyzed Date 2/16/99 <br /> •' Instrument 1 D#. GCMS2 <br /> Cone Spiked: 50ug/L <br /> LCS Result 46 <br /> LCS% Recov 92 <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 /> t 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 /> K�v n Kim i� <br /> Prole ct M pager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9902163 BLA <1> <br />