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( i <br /> 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(SlQ)988 9573 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> ettler Ryan/Geostrategies Client Project ID Chevron 9-6171, Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Argy Leyton Work Order# 9508F98 -01, 02 Reported Aug 29, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC082695BTEX17A GC082695BTEX17A GC082695BTEX17A GC082695BTEX17A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J Woo J Woo J Woo <br /> MS/MSD# G95081-108-06E G9508H08-06E G9508H08-06E G9508HO&-WE <br /> Sample Conc N D N D N D N D <br /> Prepared Date 8/26/95 8/26/95 8/26/95 8/28/95 <br /> Analyzed Date 8/26/95 8/26/95 8/26/95 8/26/95 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result: 10 10 10 31 <br /> MS % Recovery 100 100 100 103 <br /> Dup Result 10 10 10 30 <br /> MSD % Recov 100 100 100 100 <br /> RPD 00 00 00 33 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS# <br /> Prepared Date. <br /> Analyzed Date <br /> Instrument 1.D # <br /> Conc Spiked <br /> LCS Result <br /> LCS % Recov <br /> LCS 71-133 72-128 72-130 71-120 <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 /> 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 /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Mike Gregory <br /> Project Manager **NIS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9508F98 GET <1> <br />