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1 <br /> ` Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364-9233 <br /> 404 N WWget Lane Walnut Creek CA 94598 (92 5)988 9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suac 8 Sacramento CA 95834 (916)921 9600 FAX(916)9ZI oioo <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792 1865 FAX(707) 79Z 0342 <br /> t <br /> IE A Engineering Science &Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrixi <br /> Llc{uid l <br /> Lafayette, CA 94549 <br /> Fention Christa Marting Work Order# 9808C95 09 Reported Sep 25, 1998 <br /> QUALITY CONTROL DATA REPORT l <br /> Analyte MTBE <br /> QC Batch# MS082798MTBEH6A { <br /> Analy Method EPA 8260 f <br /> Prep Method <br />' Analyst S Goldstein <br /> MS/MSD # 9808D8803 I <br /> Sample Cone N D <br /> Prepared Date 8/27/98 <br /> Analyzed Date 8/27/98 <br /> istrument I D # H6 <br />' Cone Spiked 50Pg/L I <br /> Result 42 <br /> VIS % Recovery 84 <br /> rup Result 44 <br /> MSD % Recov 88 <br />' RPD 47 <br /> RPD Limit 0-25 <br /> LCS# LCS082898 <br /> I <br />`Prepared Date 8/28/98 <br /> Analyzed Date 8/28/98 <br /> strument 1 D # H6 <br /> Cone Spiked 50 frg/L <br /> ILCS Result 43 <br /> LCS % Recov 86 <br /> so-14o <br /> LCS 70-130 <br /> ontrol Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> Q IA ANA ICAL 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 10 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 /> and Herling <br /> tject Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relaive% Difference <br />' t9808C95 EEE <2> <br />