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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 9-2033 /961125-Ai <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 9611H98-01 Reported Dec 11, 19%, <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GC120596BTEX20A GC120596BTEX20A GC120596BTEX20A GC120596BTEX20A <br /> Analy. Method- EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Jirsa D Jirsa D Jirsa D Jima <br /> MS/MSD # 9611 G 1504 9611 G 1504 9611 G1504 9611 G 1504 <br /> Sample Conc N 0 N D N D N D <br /> Prepared Date 12/5/96 12/5/96 12/5/96 12/5/96 <br /> Analyzed Date 12/5/96 12/5/96 12/5/96 12/5/96 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> Result 86 84 84 25 <br /> MS % Recovery 86 84 84 83 <br /> Dup Result 94 87 86 26 <br /> MSD % Recov - 94 87 86 87 <br /> RPD 89 35 24 39 <br /> RPD Limit 0-25 0-25 025 0-25 <br /> LCS # BLK120596 BLK120596 BLK120596 BLK120596 <br /> Prepared Date 12/5/96 12/5/96 12/5/96 12/5/96 <br /> Analyzed Date 12/5/96 12/5/96 12/5/96 12/5/96 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10pg/L 10pg/L 10p9/L 30pg/L <br /> LCS Result 93 86 85 26 <br /> LCS%Recov 93 86 85 87 <br /> M D 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> 1061A NALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> rtified with known quantities of specific compounds and subjected to the entire analytical procedure Ifthe 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 batchnanager **MS=Matrix Spike,MSD=MS Duplicate, RPO=Relative%Difference 9611H98 BLA 43> <br /> fid' <br />