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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) 98S 9600 FAX(510)988 9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 Ot00 <br /> Touchstone Developments Client Project ID Chevron 9-4183 /9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 9604850 01, 02 Reported Apr 25, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Diesel <br /> QC Batch# GCO30996OH13PEXC <br /> Analy. Method EPA 8015M <br /> Prep Method' EPA 3550/DHS <br /> Analyst B Ali <br /> MS/MSD# 960463701 <br /> Sample Conc 23 <br /> Prepared Date 4/9/96 <br /> Analyzed Date 4/10/96 <br /> Instrument I D# GCHP5A <br /> Conc Spiked 25 mg/Kg <br /> Result. 70 <br /> MS % Recovery- 188 <br /> Dup. Result 44 <br /> MSD % Recov.. 84 <br /> RPD 46 <br /> RPD Limit 0-50 <br /> LCS# BLK041596 <br /> Prepared Date 4/15/96 <br /> Analyzed Date 4/16/96 <br /> Instrument I D # GCHP5B <br /> Conc Spiked 25 mg/Kg <br /> LCS Result 16 <br /> LCS % Recov 64 <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 /> SEQUOIA 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 /> Kevin Follett interference,the LCs recovery is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9604850 TCT <I> <br /> A <br />