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ei) <br /> Sequoia 680 Chesapeake Dnve 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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-8264 / 9-8264 <br /> 17170 Keaton Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Tim Walker Work Order # 9602708 01, 02, 04, 07, 09, Reported Feb 23, 1996 <br /> 11, 12, 15, 16 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Diesel <br /> QC Batch# GCO213960HBPEXB <br /> Anally Method EPA 8015M <br /> Prep Method EPA 3550/DHS <br /> Analyst B Ali <br /> MS/MSD # 960270801 <br /> Sample Conc N D <br /> Prepared Date 2/13/96 <br /> Analyzed Date 2/14/96 <br /> Instrument I D # GCHP4A <br /> Conc Spiked 25 mg/Kg <br /> Result 21 <br /> 0 M % Recovery 84 <br /> Dup Result 21 <br /> MSD % Recov 84 <br /> RPD 00 <br /> RPD Limit 0-50 <br /> LCS # BLK021396 <br /> Prepared Date 2/13/96 <br /> Analyzed Date 2/14/96 <br /> Instrument I D # GCHP4A <br /> Conc Spiked 25 mg/Kg <br /> LCS Result 23 <br /> LCS % Recov 92 <br /> LCS 50-150 <br /> Control Limits <br /> Please dote <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br />&EQU fA 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 /> Kevin Follett <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9602708 TTT <I> <br />