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j Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)9B8 9600 FAX(925)988 9673 { <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 i! <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792 0342 <br /> I <br /> i <br /> Engineering Science &Tech Client Project ID Exxon 7-3942, 5153942 1300t,,A <br /> 68 Mt Diablo Blvd , Ste B-100 Matrix Liquid ` <br /> Lafayette, CA 94549 <br />�ttention Christa Marting Work Order# 9808C95 13, 16, 17, 18 Reported Sep 25, 1998 <br /> I <br /> (QUALITY CONTROL DATA REPORTWL E <br /> { <br /> Analyte MTBE <br /> QC Batch# MS082798MTBEH6A <br /> Analy Method EPA 8260 I <br /> Prep Method , <br /> E <br /> Analyst M Williams <br /> MS/MSD# 9808C9712 <br /> Sample Conc N D i <br /> Prepared Date 8/27/98 <br /> Analyzed Date 8/27/98 <br /> nstrument I D # H6 <br />' Conc Spiked 5oJrg/L <br /> Result 47 <br /> MS % Recovery 94 <br /> t <br /> p Result 49 <br /> L*SD % Recov 98 <br /> f <br /> RPD 42 <br /> RPD Limit <br /> 025 <br /> LCS # LCS082798 <br /> repared Date 8/27/98 <br /> na lyzed Date 8/27/98 <br /> strument I D # H6 <br />,Conc Spiked song/L <br /> LCS Result 39 <br /> LCS % Recov 78 <br /> 60-140 <br /> LCS 70-130 <br /> pntrol Limits <br /> Please Note <br /> The LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> LU IAqAN " L preparation,and analytical methods employed for the samples The matrix spoke os 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 matrixand H <br /> interference the LCS recovery is to be used to validate the batch <br /> oject Manager MS-Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> 9808C95 EEE <4> <br />