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415SellOia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX( ) 364 97.33 <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 /> lip- <br /> 0 , <br /> Enviros Client Project ID Shell 1267 Country Club, Stick <br /> 270 Perkins Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9704512 10, 12, 13 Reported Apr 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC041697BTEX18A GC041697BTEX18A GCO41697BTEX18A GC041697STEXi8A GC041597BTEX18A <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 Porter A.Porter A.Porter A Porter A. Porter <br /> MS/MSD # 970428107 970428107 970428107 970428107 970428107 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 4/16/97 4/16/97 4/16/97 4/16/97 4/16/97 <br /> Analyzed Date. 4/16/97 4/16/97 4/16/97 4/16/97 4/16/97 <br /> Instrument I D #. GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Cone Spiked. 10Ng/L 10pg/L 10pg/L 30Ng/L 60Ng/L <br /> Result 99 10 99 29 61 <br /> MS % Recovery 99 100 99 97 102 <br />• Dup Result 9 3 92 92 27 58 <br /> MSD % Recov 93 92 92 90 97 <br /> RPD 62 83 73 71 50 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK0416976SA BLK041697BSA LK041697BSA BLK041697BSA BLK041697BSA <br /> Prepared Date 4/16/97 4/16/97 4/16/97 4/16/97 4/16/97 <br /> Analyzed Date 4/16/97 4/16/97 4/16/97 4/16/97 4/16/97 <br /> Instrument l D #- GCHP18 GCHP18 GCHP1a GCHP18 GCHP18 <br /> Cone Spiked 10ug/L 10yg/L 10pg/L 30pg/L 60pg/L <br /> LCS Result. 11 11 11 31 69 <br /> LCS % Recov ' 110 110 110 103 115 <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 /> SEQUOIA.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 /> I regory <br /> Project Manager '"*MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9704512 EEE <18> <br />