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1 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 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-2033, 2033-2 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe Work Order# 9610708 01, 05 Reported Oct 19, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Diesel <br /> QC Batch# GC1015960HBPEXC <br /> Analy Method EPA 8015M <br /> Prep Method EPA 3550/DHS <br /> Analyst B Sullivan <br /> MS/MSD# 961085501 <br /> Sample Cone 700 <br /> Prepared Date 10/15/96 <br /> Analyzed Date 10/17/96 <br /> Instrument I D # GCHP4B <br /> Cone Spiked: 25 mg/Kg <br /> Result 750 <br /> 4VS % Recovery 200 <br /> Dup Result 600 <br /> MSD % Recov -400 <br /> RPD 22 <br /> RPD Limit 0-50 <br /> LCS# BLK101596 <br /> Prepared Date 10/15/96 <br /> Analyzed Date 10/17/96 <br /> Instrument 10 # GCHP48 <br /> Cone Spiked 25 mg/Kg <br /> LCS Result 25 <br /> LCS % Recov 100 <br /> 50-150 <br /> LCS 60-140 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s analyzed using the same reagents, <br /> !7 <br /> U 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 9610708 TTT <1> <br /> Do% <br />