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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX (650)364 9233 <br /> IT) <br /> 404 N Wrget Lane Walnut Creek CA 94598 (5 10) 988 9600 FAX (510) 988 9673 <br /> 'Wor Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (9E6) 921 0100 <br /> • MPDS Services Client Project ID Tosco#5886 2701 W March Lane Stockton <br /> 2401 Stanwell Dr , Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarref Crider OC Sample Group 7120163-173 Reported Dec 19, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE MTBE <br /> Method EPA 8260 <br /> Analyst M Williams <br /> MS/MSD <br /> Batch# 971238902 <br /> Date Prepared 12/9/97 <br /> Date Analyzed 1219197 <br /> Instrument 1 D # H-6 <br /> Cone Spiked 50 pg/L <br /> Matrix Spike <br /> %Recovery 110 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 <br /> Relative % <br /> Difference 3 8 <br /> LCS Batch# VMB1209S <br /> Date prepared 12/9/97 <br /> Date Analyzed 12/9/97 <br /> Instrument I D # H-6 <br /> LCS % <br /> Recovery 92 <br /> °�° ecovery <br /> Control Limits: 70-130 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1210 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 /> nature on File the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> Alan B Kemp interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 7120163 MPD <13n <br />