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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988 9600 FAX[510)988-9673 <br /> 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> frillier Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792 1865 FAX(707)792 034Z <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3488 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Chnsta Marting Work Order# 9805E41 01-13 Reported Jun 10, 1998 <br /> 9805E43 23, 24 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS052498MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method <br />' Analyst M Williams <br /> MS/MSD# 9805E4101 <br /> Sample Conc N D <br /> Prepared Date 5/24/98 <br /> Analyzed Date 5/24/98 <br /> Instrument I D # H6 <br />' Conc Spiked 50yg/L <br /> Result 46 <br /> MS % Recovery 92 <br /> Dup Result 45 <br /> MSD % Recov 90 <br /> RPD 22 <br /> RPD Limit 0-25 <br />' LCS # LCS052498 <br />' Prepared Date 5/24/98 <br /> Analyzed Date 5/24/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 uq/L <br /> LCS Result 51 <br /> LCS % Recov 102 <br /> 60-140 <br />' LCS 70-130 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANAL ICAC <br /> The LCS is a control sample of known,interferent-free matrix that Is analyzed using the same reagents <br /> 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 It <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 Hering <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate RPD=Relative`Yo Difference 9805E41 EEE c 1> <br />