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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9133 ' <br /> Sequoia 404 N Wlget 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 /> Analytical <br /> - 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 6131 Pacific Ave <br /> 1680 Rogers Ave Matrix Liquid <br /> San-Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9811 H55-02-08 Reported Dec 14, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS120298MTBEH6A <br /> Anally Method EPA 8260 <br /> Prep Method NA <br /> Analyst T Costello <br /> MS/MSD # 981110721 <br /> Sample Cone N c <br /> Prepared Date 12/2/98 <br /> Analyzed Date 12/2/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50Ng/L <br /> Result 45 <br /> MS % Recovery 90 <br /> Dup Result 45 <br /> MSD % Recov 90 <br /> RPD 00 <br /> _RPD_Umit 0-25 — T <br /> - -- - -LCS # ---LCS120298 -- - ----- — --- -- - - ----------- — - - - - - --- - --- - <br /> Prepared Date 12/2/98 <br /> Analyzed Date 12/2/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50 frg/L <br /> LCS Result 42 <br /> LCS % Recov 84 <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 /> 4S1 LYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sampi <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedurethe recovery of analytes from the matrix spike does not fall within specified control limits due to matnxinterference,the LCS recovery is to be used to validate the batch <br /> y�� <br /> rojec anager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9811 H55 BLA <4> <br />