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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia <br /> s 404 N WiSet lane Walnut Creek,CA 94598 (925)988-%00 FAX(925)988-9673 <br /> Analytical819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> alaine 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 Thie Work Order# 9810727-03 Reported Oct 30, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> OC Batch# MS101598MTBEEXA <br /> Anally Method EPA 8260 <br /> Prep Method N A. <br /> Analyst L Duong <br /> MS/MSD# 981OA4902 <br /> Sample Conc <br /> Prepared Date <br /> Analyzed Date <br /> Instrument I D# <br /> Conc Spiked <br /> Result <br /> MS % Recovery <br /> Dup Result <br />• MSD % Recov <br /> RPD <br /> RPD Limit <br /> LCS## LCS102198 <br /> Prepared Date 10/21/98 <br /> Analyzed Date 10/21/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 jug/L <br /> LCS Result 44 <br /> LCS % Recov 88 <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 I ANAL ]CAL 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 recouery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> erference,the LCS recovery is to be used to validate the batch <br /> P ggy enner <br /> r <br /> Pje Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9810727 BLA <5> <br />