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41)— <br /> Sequoia 404 <br /> Chesapeake Dnvc 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,Suitc 8 Sacramento CA 95834 (916) 921 9600 FAX(91 b)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton/970401-F2 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9704289-04, -07-10 Reported Apr 16, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#. GC041197BTEX17A GC041197BTEX17A GC041197BTEX17A GC041197BTEX17A GC041197BTEX17A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A. Miraftab A. Miraftab A-Miraftab A.Miraftab A Miraftab <br /> MS/MSD #- 970428902 970428902 970428902 970428902 970428902 <br /> Sample Cone N D N D N D N D 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 I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked i o pg/L 10 pg/L 10 pg/L 30 pg/L 60 pg/L <br /> Result 11 11 10 32 63 <br /> MS % Recovery 110 110 100 107 105 <br /> Dup Result 95 95 96 29 57 <br /> MSD % Recon 95 95 96 97 95 <br /> RPD 15 15 41 98 10 <br /> RPD Limit: 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK041197 BLK041197 BLK041197 BLK041197 BLK041197 <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-# GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked lops/L 10pg/L iopg/L 30pg/L 60pg/L <br /> LCS Result. 95 95 95 29 56 <br /> LCS % Recov . 95 95 95 97 93 <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 is a control sample of known, interferent-free matrix that is analyzed using the same reagents, <br /> *�OtP'en <br /> EQU ANALYTICAL 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 /> Manager '"`MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9704289 SLA <3> <br />