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*' <br /> Sequoia 680 Chesapeake Dnvc Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> (i) 404 N Wiget Lane Walnut Creek CA 94598 (510) 9$8 9600 FAX(510)988 9673 <br /> IIF Analytical 819 Straker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blaine'Tech Services, Inc Client Project ID Chevron 9-8264/970207-H2 <br /> 1680 Rogers Avenue Matrix Liquid ' <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9702520-01-05 Reported Feb 26, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte' Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch#. GCO21397BTEX22A GCO213978TEX22A GCO21397BTEX22A GCO21397BTEX22A <br /> Analy Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method' EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst' A. Porter A.Porter A Porter A Porter <br /> M S/MSD# 970248201 970248201 970246201 970248201 <br /> Sample Cone • N D N D N D N D <br /> Prepared Date 2/13/97 2/13/97 2/13/97 2/13/97 <br /> Analyzed Date 2/13/97 2/13/97 2/13/97 2/13/97 <br /> Instrument I D #. GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked 10pg/L 10pg/L 10.ug/L 30pg/L <br /> Result. 91 93 97 28 <br /> MS % Recovery 91 93 97 93 <br /> Dup Result 92 94 97 28 <br /> MSD % Recov 92 94 97 93 <br /> RPD 11 11 0o 00 <br /> RPD Limit. 0-25 0-25 0-25 0-25 <br /> LCS # BLK021397 BLK021397 BLK021397 BLK021397 <br /> Prepared Date 2/13/97 2/13/97 2/13/97 2/13/97 <br /> Analyzed Date 2/13/97 2/13/97 2/13/97 2/13/97 <br /> Instrument I D #' GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> LCS Result. 88 89 93 27 <br /> LCS % Recov.: 88 89 93 90 <br /> 60-140 60-140 60-140 50-140 <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 1s analyzed using the same reagents, <br /> eyenner NALYTICAL 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 0 <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 /> ger **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9702520 BLA <2> <br />