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41) <br /> Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94,598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> < settler Ryan%Geostrategies .. Client Project ID Chevron 9-6171, Stockton <br /> .6747 Sierra Court, Ste J Matrix Liquid <br /> 'Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9611619 -02 Reported Nov 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#' GC111996BTDC17A GC1119%BTEX17A GC1119968TEX17A OC1 t 19966TEX17A <br /> Analy Method: EPA 8020 EPA 8020 EPA 8020 <br /> Pre Method. EPA 5030 EPA 8020 <br /> EPA 5030 EPA 5030 EPA 5030 <br /> Analyst Y Arteaga Y Arteaga Y Arteaga Y Artea a <br /> MS/MSD#- 961138818 961138818 961136818 9 <br /> Sample Conc : N D ss1138818 <br /> Prepared Date. 11/19/96 11/19/96 11/19/96 11/ / <br /> nig 96 <br /> Analyzed Date. 11/19/96 11/19/96 11/19/96 111996 <br /> Instrument LD #• GCHP17 GCHP17 GCHP17 / / <br /> Conc. Spiked- 10ug/L 10 GCHP17 <br /> y9/L 101J9/L 30 <br /> Result. 10 10 10 30 <br />• MS % Recovery 100 100 100 <br /> 100 <br /> Dup Result- 10 10 10 <br /> MSD% Recov. iDo 29 <br /> 100 100 97 <br /> RPD 00 00 00 34 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS# BLK111996 BLK111996 BLK111996 BLK111996 <br /> Prepared Date. 11/19/96 11/19/96 11/19/96 11/19/96 <br /> Analyzed Date 11/19/96 11/19/96 11/19/96 111996 <br /> instrument I D.# GCHP17 GCHP17 GCHP17 / / <br /> Conc Spiked- 10ug/L 10 GCHP17 <br /> l�+9/L 10N9/L 30!19/L <br /> LCS Result 10 10 10 <br /> LCS %Recov • 30 <br /> 100 100 100 100 <br /> M M D s .140 60-140 60-140 <br /> 60-140 <br /> LCS <br /> 70-130 70-130 7x130 70-130 <br /> Control Limits <br /> [Interference, <br /> lease Note <br /> The LCS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents, <br /> I&EOUOIA ANALYTICAL reparation,and analytical methods employed for the samples The matrix spoke is an aliquot of sample <br /> rtified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> e recovery of analytes from the matrix spoke does not fall within specified control limits due to matrix <br /> the LCS recovery is to be used to validate the batch <br /> I regory <br /> Project Manager **MS=Matrix Spike, MSD=NIS Duplicate, RPO=Relative%Difference <br /> 9611619 GET ¢2> <br />