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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 Straker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <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# 9604753 01 Reported Apr 15, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte TRPH <br /> QC Batch#. OP0411965520EXA <br /> Analy Method SM 552CEF Mod <br /> Prep Method EPA 3550 <br /> Analyst: Garde-Alcayde <br /> MS/MSD# 960475301 <br /> Sample Cone N D <br /> Prepared Date 4/11/96 <br /> Analyzed Date- 4/12/96 <br /> Instrument I D # MANUAL <br /> Cone Spiked 500 mg/Kg <br /> Result- iso <br /> MS % Recovery 76 <br /> Dup Result. 430 <br /> MSD % Recov 86 <br /> RPD 12 <br /> RPD Limit 0-50 <br /> LCS# BLK041196 <br /> Prepared Date 4/11/96 <br /> Analyzed Date 4/12/96 <br /> Instrument LD # MANUAL - <br /> Conc. Spiked 500 mg/Kg <br /> LCS Result. 390 <br /> LCS % Recov 78 <br /> LCS 60-140 <br /> Control Limits <br /> i <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 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> j 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 9604753 TTT <2> <br /> i <br />