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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 /> i <br /> I <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-8264/980609-J1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9806003 -01-05 Reported Jun 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# 06V8210 06VS210 06V8210 06VI3210 <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 8015M EPA 8015M EPA 8015M EPA 8015M <br /> Analyst L Hall L Hall L Hall L Hall <br /> LCS/LCSD # LCS061298 LCS061298 LCS061298 LCS061298 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 6/12/98 6/12/98 6/12/98 6/12/98 <br /> Analyzed Date 6/12/98 6/12/98 6/12/98 6/12/98 <br /> Instrument 10 # - - - - <br /> Conc Spiked 20 pg/L 20 fag/L 20 fug/L 20 fug/L <br /> Result 20 20 20 20 <br /> LCS % Recovery 100 100 100 100 <br /> Dup Result 21 21 21 22 <br /> LCSD % Recov 105 105 105 110 <br /> RPD 49 49 49 95 <br /> RPD Limit 0-30 0-30 0-30 0-30 <br /> I <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,interferent4ree matrix that is analyzed using the same reagents, <br /> 7Elap#18 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 specifies!control limits due to matrix <br /> Interference,the LCS recovery is to be used to validate the batch <br /> egory <br /> ct Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9806003 BLA <1> <br />