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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Waget 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 J Client Project ID Shell 8t6ckton/970610-Z4 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran The Work Order# 9706578-05 Reported Jun 24, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte' Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO61697BTEX0IA GC061697BTEXOIA GCO61697BTEX01A GCO61597BTEXOIA G006169713TEX0IA <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# 970658503 970658503 970658503 970658503 970658503 <br /> Sample Cone - N D N D N D N D N D <br /> Prepared Date 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Analyzed Date 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Instrument I D #' GCHP1 GCHP1 GCHP1 GCHP1 GCHP1 <br /> Cone. Spiked' 10 Ng/L 10yg/L 10 erg/L 30 Ng/L 60 ug/L <br /> Result 79 90 98 30 68 <br /> 10% Recovery 79 90 98 100 113 <br /> Dup. Result. 81 92 10 30 70 <br /> MSD% Recov . 81 92 100 100 117 <br /> RPD 25 22 20 00 29 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS# BLK061697 BLK061697 BLKD61697 BLK061697 BLK061697 <br /> Prepared Date 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Analyzed Date 6/16/97 6/16/97 6/16/97 6/16/97 6/16/97 <br /> Instrument I D.# GCHP1 GCHPI GCHP1 GCHP1 GCHP1 <br /> Cone Spiked 10ug/L long/L 1opg/L 30pg/L 60pg/L <br /> LCS Result, 79 87 97 29 67 <br /> LCS %Recov 79 87 97 97 112 <br /> i <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 /> 0 Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SE 1101 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 /> Peggy Penn <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9706578 BEA <3> <br />