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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 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 /> Blaine Tech Services, Inc Client Project ID Chevron 9-1918/961024-H1 <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 961OH36-04 Reported Nov 8, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC103196BTEX02A GC103196BTEX02A GC103196BTEX02A GC103196BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst Y Arteaga Y Arteaga Y Arteaga Y Arteaga <br /> MS/MSD# 961OD1407 961OD1407 961OD1407 961OD1407 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 10/31/96 10/31/96 10/31/96 10/31/96 <br /> Analyzed Date 10/31/96 10/31/96 10/31/96 10/31/96 <br /> Instrument I D #. GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10pg/L 10yg/L 10pg/L 30pg/L <br /> Result 96 81 78 22 <br /> MS % Recovery 96 81 78 73 <br /> Dup Result 11 91 87 24 <br /> MSD %Recov 110 91 87 80 <br /> RPD 14 12 11 87 <br /> RPD Limit 0-25 0.25 025 025 <br /> LCS# BLK103196 BLK103196 BLK103196 BLK103196 <br /> Prepared Date 10/31/96 10/31/96 10/31/96 10/31/96 <br /> Analyzed Date 10/31/96 10/31/96 10/31/96 10/31/96 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10 jug/L 10 fug/L 10 Yg/L 30 ug/L <br /> LCS Result 11 94 91 25 <br /> LCS% Recov 110 94 91 83 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> i <br /> Please Note <br /> The LCS is a control sample of known interferent-free matrix that is analyzed using the same reagents, <br /> •Ueggyt <br /> AN LYTICAL 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 /> nernager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 961OH36 BLA <2> <br />