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Sequoia 680 Chesapeake Drwe Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1(a) 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 Shell Stockton/970402-F1 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9704280 -10, 12 -13 Reported Apr 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#: GCO41197BTEX21A GC041197BTEX21A GC04119713TEX21A GC041197BTEX21A GC041197BTEX21A <br /> Analy Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA S015M <br /> Prep Method. EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: D Jirsa D Jirsa D Jirsa D Jirsa D Jirsa <br /> M S/MSD # 970422501B 970422501B 970422501B 970422501B 970422501B <br /> Sample Conc N D N D N D ND N D <br /> Prepared Date 4/11/97 4/11/97 4/11/97 4/11/97 4/11/97 <br /> Analyzed Date: 4/11/97 4/11/97 4/11/97 4/11/97 4/11/97 <br /> Instrument LD #- GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked 10pg/L lopg/L 10Ng/L 30pg/L 60Ng/L <br /> Result: 9 9 10 10 31 60 <br /> 40S % Recovery 99 100 100 103 100 <br /> Dup Result. 9 9 10 99 30 59 <br /> MSD % Recov .. 99 100 99 100 98 <br /> RPD 00 00 10 33 17 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS #. BLK041197 BLK041197 BLK041197 BLK041197 BLK041127 <br /> Prepared Date 4/11/97 4/11/97 4/11/97 4/11/97 4/11/97 <br /> Analyzed Date 4/11/97 4/11/97 4/11/97 4/11/97 4/11/97 <br /> Instrument I D.#. GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc. Spiked: 10pg/L 10pg/L 10pg/L 30pg/L 60Ng/L <br /> LCS Result 98 99 99 30 59 <br /> LCS % Recov .. 98 99 99 100 98 <br /> 60-140 60.140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> IAA ALYTICAL 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 /> g y nn r <br /> P l ct Mana **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9704278 BLA <3> <br />