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N <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (41 S) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 %00 FAX(510) 988 9673 <br /> Analytical 819 Striker 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# 9503653 -03, 05 Reported Mar 29, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO32095BTEX02A GC032095BTEX02A GCO32095BTEX02A GCO32095BTEX02A <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# G9503A15-04C G9503A15-040 G9503A15-04C G9503A15-04C <br /> Sample Conc N D N D N D N D <br /> Prepared Date 3/20/95 3/20/95 3/20/95 3/20/95 <br /> Analyzed Date 3/20/95 3/20/95 3/20/95 3/20/95 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10 ug/L i0 ug/L io ug/L 30 ug/L <br /> Result 11 10 10 31 <br /> MS % Recovery iia 100 100 103 <br /> . Dup Result 89 87 86 25 <br /> MSD % Recov 89 87 86 83 <br /> RPD 21 14 15 21 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # <br /> Prepared Date <br /> Analyzed Date <br /> Instrument I 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 /> IOSEQUOIA ANALYTICAL 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 /> egoV the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> M <br /> interference,the LCS recovery is to be used to validate the batch <br /> fee<Gr <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9503853 GET <2> <br />