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Sequoia 680 Chesapeakc Drive Redwood City CA 94063 (650) 364 9600 FAX (650) 364-9233 <br /> 404 N Wiget Lane Walnut Creck CA 94598 f510) 988 9600 FAX (510) 988 9673 <br /> I,�► Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Delta Environmental Consultants Client Project ID Exxon 7-3708, D093-809 <br /> 3164 Gold Camp Drive #200 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Keoni Almeida Work Order # 9711 F94-08 Reported Dec 12 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS120597MTBEF3A <br /> Analy Method BPA 8260 <br /> Prep Method NA <br /> Analyst M Williams <br /> MS/MSD # 9711F'4104 <br /> Sample Conic 24 <br /> Prepared Date 12/5/97 <br /> Analyzed Date 12/5/97 <br /> Instrument I D # F3 <br /> Conic Spiked 50 Mcg/L <br /> Result 73 <br /> AVIS % Recovery sa <br /> Dup Result 73 <br /> MSD % Recov 98 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS # LCS120597 <br /> Prepared Date 12/5/97 <br /> Analyzed Date 12/5/97 <br /> Instrument I D # F3 <br /> Conc Spiked 5ofig/L <br /> LCS Result 49 <br /> LCS % Recov 98 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known, interferent free matrix that is analyzed using the same reagents <br />*QUO OALYTICAL 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 If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> i interference,the LCS recovery is to be used to validate the batch <br /> regory <br /> Project Manager W MS=Matrix Spike, MSD=MS Duplicate RPD=Relative% Difference 9711F94 DLT <3> <br />