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4D <br /> 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 /> 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 /9-8264 <br /> 17170 Keaton Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Tim Walker Work Order# 9602708 20, 21 Reported Feb 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Diesel <br /> QC Batch# GCO213960HBPEXB <br /> Analy Method EPA 8015M <br /> Prep Method EPA 3520 <br /> Analyst B Ali <br /> MS/MSD# 960271705 <br /> Sample Conc 870 <br /> Prepared Date 2/13/96 <br /> Analyzed Date 2/14/96 <br /> Instrument I D # GCHP413 <br /> Conc Spiked 1000 jig/L <br /> Result- 2300 <br />*MS %Recovery 143 <br /> Dup Result 2400 <br /> MSD % Recov 153 <br /> RPD 43 <br /> RPD Limit 0-50 <br /> LCS # BLK021396 <br /> Prepared Date 2/13/96 <br /> Analyzed Date 2/14/96 <br /> Instrument I D # GCHP48 <br /> Conc Spiked 1000,ug/L <br /> LCS Result 720 <br /> LCS % Recov 72 <br /> LCS 50-150 <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 /> EQUOIA 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 ¢2> <br />