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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 79Z 1865 FAX(707)792-0342 <br /> Blame Tech Services, Inc Client Project ID Chevron 9-2033 /980521-L1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9805E75 -01-04 Reported Jun 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# 05V8166 05V8166 05V8166 05V8166 <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method N A N A N A N A <br /> Analyst L Hall L Halt L Hall L Hall <br /> LCS/LCSD# LCS052798 LCS052798 LCS052798 LCS052798 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 5/27/98 5/27/98 5/27/98 5/27/98 <br /> Analyzed Date 5/27/98 5/27/98 5/27/98 5/27/98 <br /> Instrument I D # - - - - <br /> Conc Spiked 20 ftg/L 20 ftg/L 20,ug/L 20yg/L <br /> Result 20 19 18 19 <br /> S % Recovery 100 95 90 95 <br /> Dup Result 19 19 17 19 <br /> MSD % Recov 95 95 85 95 <br /> RPD 51 00 57 00 <br /> RPD Limit 0-30 0-30 0-30 0-30 <br /> LCS 80-120 80-120 80-120 80-120 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents, <br /> flap#1849 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 fail within specified control limits due to matrix <br /> interference,the LOS recovery is to be used to validate the batch <br /> gory <br /> Pro ct Manager ""MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9805E75 BLA <1> <br />