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Sequoia 680 Chesapeake Drive Redwood City CA 940, (415) 364 9600 FAX (415) 364 9233 � <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 986 9673 <br /> %„� Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> 0 <br /> Enviros Client Project ID Shell 2575 Country Club, STCK <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9701065 -01-04 Reported Jan 16, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#' GCO10697BTEXEXA GC010597STEXEXA GCO10697STEXEXA GCO10697BTEXEXA <br /> Anally Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A Porter A Porter A Porter A Porter <br /> MS/MSD # 970109605 970109605 970109605 970109605 <br /> Sample Conc N D N D N D N D <br /> Preparers Date 1/6/97 1/6/97 1/6/97 1/6/97 <br /> Analyzed Date. 1/6/97 1/6/97 1/6/97 1/6/97 <br /> Instrument LD # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 017 017 017 049 <br /> MS % Recovery 85 85 85 82 <br /> . ❑Up Result 017 017 017 049 <br /> MSD % Recov 85 85 $5 82 <br /> RPD 00 00 00 00 <br /> RPD Limit 0-25 0-25 025 0-25 <br /> LCS # ELK010697 BLK010697 ELK010697 BLK010697 <br /> Prepared Date 1/6/97 1/6/97 1/6/97 1/6/97 <br /> Analyzed Date 1/6/97 1/6/97 1/6/97 1/6/97 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Result 019 019 019 056 <br /> LCS % Recov 95 95 95 93 <br /> MS/MSD- 60-140 60-140 60-140 60-140 <br /> LCS 65-135 70130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that 1s 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 /> 4- ie� <br /> interference,the LCS recovery is to be used to validate the batch <br /> v4 k regory <br /> Project Manager **MS=Matrix Spike, MSR=MS Duplicate RPD=Relative % Difference 9701065 EEE <1> <br /> F� <br />