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Sequoia 680 Chesapeake Drive Redwood Ciry,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> i 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 /> Alaine Tech Services, Inc Client Project ID Shell Stockton /970805-S1 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9708341-01, 02 Reported Aug 13, 1997 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO811978TEX02-A GC081197STEX02A GCO81197BTEX02A GCO81197BTEX02A GCO81197BTEX02A <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# 9707G3103 970763103 970763103 9707133103 9707G3103 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 8/11/97 8/11/97 8/11/97 8/11/97 8/11/97 <br /> Analyzed Date 8/11/97 8/11/97 8/11/97 8/11/97 8/11/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10 pg/L 10 pg/L 10 pg/L 30 Erg/L 60 pg/L <br /> Result 10 98 10 30 69 <br /> MS % Recovery 100 98 100 100 115 <br /> GDup Result 95 92 94 28 66 <br /> MSD % Recov 95 92 94 93 110 <br /> RPD 51 63 62 69 44 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK081197 BLK081197 BLK081197 BLK081197 BLK081197 <br /> Prepared Date 8/11/97 8/11/97 8/11/97 8/11/97 8/11/97 <br /> Analyzed Date 8/11/97 8/11/97 8/11/97 8/11/97 8/11/97 <br /> Instrument I.D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conic Spiked 10pg/L 10pg/L 10pg/L 30pg/L 60pg/L <br /> LCS Result 94 91 92 28 64 <br /> LCS % Recov 94 91 92 93 107 <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 /> SEQLJOIA 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 /> J 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 /> Peggy Penn�r <br /> Project Man er "MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9708341 BLA <3> <br /> Ca <br />