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rSequoia 6$O Chesapeake Drive Redwood City CA 94063 (650) 364 %00 FAX(650) 364-9233 <br /> 404 N W,Ser Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 ; <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 t <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792 t865 FAX(707) 792 0342 <br /> i <br /> rE A Engineering Science &Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste 13-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9808C95 19, 20, 21 Reported Sep 25, 1998 <br /> rQUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' QC Batch# MS082698MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst L Duong r <br /> MS/MSD # 980892902 <br /> Sample Conc N D <br /> Prepared Date 8/26/98 <br /> Analyzed Date 8/26/98 <br /> Instrument I D # H6 f <br /> Conc Spiked 5oPg/L <br /> rResult as <br /> MS % Recovery 96 ; <br /> 10 Dup Result 49 t <br /> MSD % Recov 98 <br />' RPD 21 <br /> RPD Limit 025 <br /> r <br /> LCS # LC8082798 <br />' Prepared Date 8/27/98 c <br /> Analyzed Date 8/27/98 <br /> Instrument I D # H6 { <br /> r Conc Spiked 50Pg/L <br /> LCS Result 48 <br /> LCS % Recov 96 <br /> r , <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, t <br /> IS UOIA AN LYTICAL preparation,and analytical methods employed for the samples The matrix spike Is an aliquot of sample t <br /> fortified with known quantities of specific compounds and subjected to the entre 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 /> Richard Herling <br /> rProject Manager MS Matrix Sprke,MSD=M5 Duplicate, RPD=Relative% Difference 9808C95 EEE <5> €t <br /> i <br />