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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 79Z 1865 FAX(707)792-0342 Blame Tech Services, Inc Client Project ID Chevron 9-2033 /980521-L1 1680 Rogers Ave Matrix Liquid San Jose, CA 95112 Attention Fran Thie Work Order# 9805E75 -01-04 Reported Jun 9, 1998 QUALITY CONTROL DATA REPORT Analyte Benzene Toluene Ethyl Xylenes Benzene QC Batch# 05V8166 05V8166 05V8166 05V8166 Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 Prep Method N A N A N A N A Analyst L Hall L Halt L Hall L Hall LCS/LCSD# LCS052798 LCS052798 LCS052798 LCS052798 Sample Conc N D N D N D N D Prepared Date 5/27/98 5/27/98 5/27/98 5/27/98 Analyzed Date 5/27/98 5/27/98 5/27/98 5/27/98 Instrument I D # - - - - Conc Spiked 20 ftg/L 20 ftg/L 20,ug/L 20yg/L Result 20 19 18 19 S % Recovery 100 95 90 95 Dup Result 19 19 17 19 MSD % Recov 95 95 85 95 RPD 51 00 57 00 RPD Limit 0-30 0-30 0-30 0-30 LCS 80-120 80-120 80-120 80-120 Control Limits Please Note SEQUOIA ANALYTICAL The LCS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents, flap#1849 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample fortified with known quantities of specific compounds and subjected to the entire analytical procedure If the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix interference,the LOS recovery is to be used to validate the batch gory Pro ct Manager ""MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9805E75 BLA <1>