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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 /> *I,r Analytical 819 Straker Avenue Su1te 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 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# 9604F67 01 Reported Apr 30, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Reactive Cyanide Reactive Sulfide <br /> QC Batch# IN042596084600A IN042596084600A <br /> Analy 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 # LCS042596 LC8042596 <br /> Prepared Date- 4/25/96 4/25/96 <br /> Analyzed Date 4/25/96 4/25/96 <br /> Instrument I 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 6 5-40 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 /> COIA 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 /> 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 9604F67 TTT <I> <br />