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Sequoia 680 Chesapeake Drive Redwood CLty CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N WL8et Le Walnut Creek CA 94598 (510) 988 9600 FAX (510) `988 9673 <br /> ,!D- Analytical an <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Envirost Client Project ID ' Shell 141 N EI Dorado, Stock <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9604470 -16-26, 28, 29 Reported Apr 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> CC Batch# GCO41096BTEXEXA GCO41096BTEXEXA GC041096BTEXEXA GCO41096BTEXEXA <br /> Analy Method EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: D Jima D Jrrsa D Jirsa D Jirsa <br /> MS/MSD #: 9604398-04 9604398.04 9604398-04 9604398-04 <br /> Sample Cone. N D N D N D N D <br /> Prepared Date 4/10/96 4/10/96 4/10/96 4/10/96 <br /> Analyzed Date 4/10/96 4/10/96 4/10/96 4/10/96 <br /> Instrument I D ##' GCHP1 GCHP1 GCHP1 GCHP1 <br /> Cone Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> Result: 016 016 016 048 <br />• MS % Recovery: 8o 80 80 80 <br /> Dup Result 016 016 016 050 <br /> MSD % Recov.. 80 80 80 83 <br /> RPD 00 00 00 41 <br /> RPD Limit. 0-50 0-50 0-50 0-50 <br /> LCS# GBLK041096BSA GBLK041096BSA GBLK041096BSA GBLK041096BSA <br /> Prepared Date 4/10/96 4/10/96 4/10/96 4/10/96 <br /> Analyzed Date: 4/10/96 4/10/96 4/10/96 4/10/96 <br /> Instrument l D #: GCHP1 GCHP1 GCHP1 GCHP1 <br /> Cone Spiked- 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Result 019 019 019 057 <br /> LCS % Recov: 95 95 95 95 <br /> LCS <br /> Control Limits 50-150 5x150 50-150 50-150 <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA AN YTICAL 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 /> Mike Gregory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Retative%Difference 9604470 EEE <3> <br />