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Ci 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 /> frr,�7 Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)92t 0100 <br /> Touchstone Developments Client Project ID Chevron 9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 96041`67 01 Reported Apr 30, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Reactive Cyanide Reactive Sulfide <br /> OC Batch# IN042596084600A IN042596084600A <br /> Anally Method SW-846 SW-846 <br /> Prep Method NA NA <br /> Analyst A Pina D Lawrence <br /> MS/MSD # <br /> Sample Conc - <br /> Prepared Date <br /> Analyzed Date <br /> Instrument I D # <br /> Conc Spiked <br /> Result <br /> MS % Recovery <br /> Dup Result <br /> MSD % Recov <br /> RPD <br /> RPD Limit <br /> LCS # LCSO42596 LCSO42596 <br /> Prepared Date 4/25/96 4/25/96 <br /> Analyzed Date 4/25/96 4/25/96 <br /> Instrument 1 D # MANUAL MANUAL <br /> Conc Spiked 0 20 mg/L 10 mg/L <br /> LCS Result 0 043 99 <br /> LCS %Recov 21 99 <br /> LCS 65-40 80 120 <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 /> •$1=� OIA ANALYT AL 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 9604F67 TTT <1 i <br />