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Sequoia <br /> 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> R <br /> S <br /> 404 N Wiget lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> � 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> �s I Analytical 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 1071 North Main St <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9810727-04 Reported Oct 30, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> CSC Batch# MS102098MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst T Costello <br /> MS/MSD # 981068501 <br /> Sample Conc N D <br /> Prepared Date 10/20/98 1 <br /> Analyzed Date - 10/20/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 pg/L <br /> Result 43 <br /> MS % Recovery 86 <br /> Dup Result 44 <br /> MSD % Recov 88 • <br /> RPD 23 <br /> RPD Amit 0-25 <br /> LCS # LCS102098 <br /> Prepared Date 10/20/98 <br /> Analyzed Date 10/20/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50jig/L <br /> LCS Result 45 <br /> LCS % Recov 90 <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 /> SE ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> ortified 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 /> egg Penner <br /> role t Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative o Difference 9810727 BLA <4> <br />