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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAx(650)364-9233 <br /> Sequoia 404 N W Set Lane Walnut Creek.CA 94598 (510)988-9600 FAX(510)988-9673 <br /> McDowell <br /> 9 921-9600 FAX(916)921-0100 <br /> Analytical 819 5Avenue Suite 8 Sacramento 95834 (916707) <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 ( )792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies ' ,a frr Cxlient ProN;arcrt ID.n. .. Chevron 9-661 71'. <br /> hevron9-66171',rSto-.kton ,. .. <br /> ' <br /> N <br /> `6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 Reported Jun 4, 1998- <br /> 'Attention Deanna Harding Work Order# g8d5584 -01-05 p r VJJ M1y r .vim. <br /> QUALITY CONTROL DATA REPORT <br /> Xylenes GasAnalyte. Benzene Toluene Ethyl X Y <br /> Benzene <br /> 05V8017 05V8017 <br /> QC Batch# 05V8017 05V8017 05V8017 EPA 8020 EPA S015M <br /> Analy Method' EPA 8020 EPA 8020 EPA 8020 N A N A. <br /> Prep Method N A. N k N A <br /> Analyst L Hall L Hall L Hail L Hall L Hall <br /> LCS/LCSD # LCS051498 LCS051498 LCS051498 LCS051498 LCS051498 <br /> ND N0 ND ND <br /> Sample Cone N D 5/14/98 5/14/98 <br /> Prepared Date 5/14/98 5/14/98 5/14/98 5/15/98 5/15/88 <br /> Analyzed Date' 5/15/98 5/15/98 5/15/98 - - <br /> Instrument I D # - - 20Mg/L 20pg/L <br /> Cone Spiked 201�g/L z0 us/L 20 ug/L <br /> Result 23 22 20 23 17 <br /> CS % Recovery 120 110 <br /> 100 120 85 <br /> 4V <br /> Dup Result 22 22 20 23 18 <br /> LCSD % Recov 110 110 100 120 90 <br /> RPD 44 00 00 00 57 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> i <br /> MSIMSD <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LOS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents, <br />• Vie <br /> 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 /> ry <br /> ager **MS=Matrix Spike,MSD=MS Duplicate,RPR=Relative%Difference 9805584 GET c 1 <br />