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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) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (9t6)92 t 0100 <br /> Touchstone Development Client Project ID Chevron 9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 9604598 06, 07 Reported Apr 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Total Petroleum <br /> Hydrocarbons <br /> QC Batch# IN0416964181 FTB <br /> Analy Method EPA 418 1 <br /> Prep Method. NA <br /> Analyst D Williams <br /> MS/MSD# <br /> Sample Cone <br /> Prepared Date <br /> Analyzed Date <br /> Instrument I D # <br /> Cone Spiked <br /> Result <br /> MS % Recovery <br /> • Dup Result <br /> MSD % Recov: <br /> RPD. <br /> RPD Limit- <br /> LCS# LCSO41696 <br /> Prepared Date 4/16/96 <br /> Analyzed Date 4/16/96 <br /> Instrument I D.# F1`I81 <br /> Cone Spiked 210 mg/Kg <br /> LCS Result 190 <br /> LCS %Recov 90 <br /> LCS 60-140 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,tnterferent4ree 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 /> 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 9604898 TTT <5> <br />