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Q <br /> Y,t Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> el) 1 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytica819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> 0. . <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# 9508F98 -03 -07 Reported Aug 29, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC082495BTEX02A GCO82495BTEX02A GCO82495BTEX02A GCO824958TEX02A <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 # G9508A74-21C G950BA74-21C 09508A74-21C G9508A7421C <br /> Sample Conc N D N D N D N D <br /> Prepared Date. 8/23/95 8/23/95 8/23/95 8/23/95 <br /> Analyzed Date: 8/23/95 8/23/95 8/23/95 8/23/95 <br /> Instrument LD # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Result 97 96 94 29 <br /> MS % Recovery. 97 96 94 97 <br /> Dup. Result 89 85 84 26 <br /> MSD %% Recov 89 85 84 87 <br /> RPD 86 12 11 11 <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 Nate <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 is 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 fall 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 *"MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative %Difference 9508F98 GET <2n <br />