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4D Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> WIF Analytical 819 Sinker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-8264/8264-1 <br /> 6280 Stoneridge Mall Rd , B211 Matrix Solid <br /> Pleasanton, CA 94588 <br /> Attention Anne Marie Dockstader Work Order # 9511587-07, 09, 11, 13, 15, 17 Reported Nov 16, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Diesel <br /> QC Batch# GC1113950HBPEXA <br /> Analy Method EPA8015M <br /> Prep Method EPA 3550 <br /> Analyst J Minkel <br /> MS/MSD # 951170211 <br /> Sample Conc 15 <br /> Prepared Date 11/13/95 <br /> Analyzed Date 11/16/95 <br /> Instrument I D # GCHP5 <br /> Conc Spiked 25 mg/Kg <br /> Result 31 <br /> MS % Recovery 64 <br /> Dup Result 45 <br /> MSD % Recov 120 <br /> RPD 37 <br /> RPD Limit 0-50 <br /> LCS # BLK111395 <br /> Prepared Date 11/13/95 <br /> Analyzed Date. 11/14/95 <br /> Instrument I D # GCHP4 <br /> Conc Spiked 25 mg/Kg <br /> LCS Result 16 <br /> LCS % Recov 64 <br /> M D <br /> LCS 38-122 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SE OIA ANALYTICAL 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 /> interference the LCS recovery is to be used to validate the batch <br /> Mark Cargasacchl <br /> Project Manager **MS=Matrix Spike MSD=MS Duplicate RPO=Relative%Difference 9511587 TTT ¢3> <br />