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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233
<br /> r►:� 404 N W,get Lane Walnut Creek CA 94598 (514) 988 9600 FAX(5 10) 988 9673
<br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100
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<br /> hE A Engineering SCienceY&Tech Client Project ID' Exxon 7-3942,8373942130 >h
<br /> x'3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid `
<br /> "Lafayette, CA 94549 Reported May 23, 1995<
<br /> v Attention T Faulkner _Work Order# 9505983-02,12, 18`9505985-20 xk„ 14 ter, Y
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<br /> QUALITY CONTROL DATA REPORT
<br /> Analyte Benzene Toluene Ethyl Xylenes
<br />' Benzene
<br /> GC Batch#' GCO51995BTEX21A GC051995BTEX2IA GC051995BTEX21A GC051995BTEX2IA
<br /> Analy Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020
<br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030
<br /> Analyst' J Minkel J Minkel J Minkel J Minkel
<br /> MS/MSD#. 950581103 950581103 950581103 950581103
<br />' Sample Conc : N D N D N D N D
<br /> Prepared Date- 5/19/95 5/19/95 5/19/95 5/19/95
<br /> Analyzed Date 5/19/95 5/19/95 5/19/95 5/19/95
<br />' Instrument I D #: GCHP21 GCHP21 GCHP21 GCHP21
<br /> Conc Spiked 10 Etg/L 10 Ng/L 10 N9/L 30 ug/L
<br /> Result 84 8 6 a 5 25
<br /> MS % Recovery- 84 86 85 83
<br /> Dup. Result 7 5 7 6 77 23
<br /> MSD % Recov : 75 76 77 77
<br /> RPD 11 12 99 83
<br /> RPD Limit. 0-50 0-50 0-50 0-50
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<br /> LCS
<br />' Prepared Date: - - - -
<br /> Analyzed Date - - - -
<br />' Instrument I.D #:
<br /> Conc. Spiked
<br /> LCS Result: - - - -
<br />' LCS %Recov.: - - - -
<br /> /M9D
<br /> LCS 71-133 72-128 72-130 71-120
<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 /> Fey ALYTICAL 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 It
<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 /> Project Manager "MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9505983 EEE <2>
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