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Sequoia 680 Chesapeake Drive 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 /> 1IW Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Enviros Client Project ID Shell 1267 Country Club, Stick <br /> v270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9704512 02-08, 14 Reported Apr 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC041197BTEXEXA GC041197BTEXEXA GC041197BTEXEXA GC041197BTEXEXA GC041097BTEXEXA <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 J Heider J Heider J Heider J Heider J Heider <br /> MS/MSD # 9703HO720 9703HO720 9703HO720 9703HO720 9703HO720 <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.# GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 016 016 016 049 11 <br />. MS % Recovery 80 80 80 82 92 <br /> Dup Result 016 016 016 049 11 <br /> MSD % Recov 80 so 80 82 92 <br /> RPD 00 00 00 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS#. BLK041197BSA BLK041197BSA LK0411973SA BLK041197BSA BLK04119733A <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 # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Cone. Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result- 018 018 017 053 12 <br /> LCS % Recov 90 90 85 88 100 <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 NA WICAL 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 /> Gregory <br /> Project Manager "*MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9704512 EEE <3> <br /> r9DCL— - <br />