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Sequoia 6$0 Chesapeake Drive Redwood Cary CA 94063 (650) 364-9600 FAX(650) 364-9633 <br /> (D— 404 N Wiget Lane Walnut Creek CA 9459$ (9Z5)988-9600 FAX(925)988-9573 <br /> 819 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 /> Blaine Tech Services, Inc Client Project ID Shell 2575 Country Club Blvd <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 98071-188-17-18, 9807H89-23 Reported Aug 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte' MTBE <br /> QC Batch# MS080698MTBEH68 <br /> Anally Method EPA 8260 <br /> Prep Method N A. <br /> Analyst L Duong <br /> MS/MSD #• 9807HS920 <br /> Sample Conc. N D <br /> Prepared Date 8/6/98 <br /> Analyzed Date 8/6/98 <br /> Instrument I D.# H6 <br /> Conc Spiked 50ug/L <br /> Result 45 <br /> MS % Recovery 90 <br /> Dup Result 46 • <br /> MSD % Recov 92 <br /> RPD 22 <br /> RPD Limit G-25 <br /> LCS # LCSOS0698 <br /> Prepared Date 8/6/98 <br /> Analyzed Date 8/6/98 <br /> Instrument I D.# H6 <br /> Conc Spiked 50ug/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 /> ALYTICAL 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 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 /> P g Penner <br /> P ct Manager "" MS=Matrix Spike, MSD=IVIS Duplicate, RPD=Relative%Difference 9807H87 BLA <6> <br />