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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 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler 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# 95031353 -01, 02, 04, 07 Reported Mar 29, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC031995BTEX02A GCO31995BTEX02A GC031995BTEX02A GC031996BTEX02A <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 Minkel J Minkel J Minkel J Minkel <br /> MS/MSD# G9503A08-1013 G9503A08-10B G9503A08-10B G9503A08-10B <br /> Sample Cone N D N D N D N D <br /> Prepared Date 3/19/95 3/19/95 3/19/95 3/19/95 <br /> Analyzed Date 3/19/95 3/19/95 3/19/95 3/19/95 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Cone Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result 96 97 99 30 <br /> MS % Recovery 96 97 99 100 <br /> • Dup Result 96 96 98 29 <br /> MSD % Recov 96 96 98 97 <br /> RPD 00 10 10 34 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # <br /> Prepared Date <br /> Analyzed Date <br /> Instrument I D # <br /> Cone 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 /> E UOIA NALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> �O 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 /> Mike Grego interference,the LCS recovery is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike,MSDwMS Duplicate,RPD=Relative%Difference 9503853 GET <1> <br />