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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 lel Wig,,Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> (i) Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> VQWEnvtros + V Client Project 1D' Shell 141 N EI Dorado, StoclC <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 i <br /> Attention Joe Neely Work Order# 9604470 -10, 15, 27 Reported Apr 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# GC041296BTEXEXA GC041296BTEXEXA GCO41296BTEXEXA GCO41296STEXEXA <br /> Analy Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Jirsa D Jrrsa D Jirsa D Jirsa <br /> MS/MSD#• 9604398-13 9604398-13 9604398-13 9604398-13 <br /> Sample Conc : N D N D N D N D <br /> Prepared Date: 4/12/96 4/12/96 4/12/96 4/12/96 <br /> Analyzed Date 4/12/96 4/12/96 4/12/96 4/12/96 <br /> Instrument LD #. GCHP18 GCHP18 GCHP18 GCHP18 <br /> Cone. Spiked: 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> Result: 016 018 017 051 <br /> MS % Recovery. 80 90 85 85 <br /> Dup Result 016 017 017 049 <br /> MSD % Recov : 80 85 85 82 <br /> RPD: 00 57 00 40 <br /> RPD Limit. 0-50 0-50 0-50 0-50 <br /> LCS #: GBLK0412963SA GBLK041296BSA GBLK041296BSA GELK041296BSA <br /> Prepared Date. 4/12/96 4/12/96 4/12/96 4/12/96 <br /> Analyzed Date: 4/12/96 4/12/96 4/12/96 4/12/96 <br /> Instrument LD#: GCHP18 GCHP18 GCHP18 GCHP18 <br /> Cone. Spiked: 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Result: 018 019 018 054 <br /> LCS % Recov.: 90 95 90 90 <br /> LCS <br /> Control Limits 50-150 50-150 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 /> is 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 fail 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=Relative% Difference 9604470 EEE <2> <br />