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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 /> Analytical 819 Sinker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100
<br /> <EA Engineering{Science&Tech Client Project ID %Exxon 7-3942,83739421307 n t
<br />' X3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid
<br /> �Lafayette, CA 94549 '
<br /> ,#Attention T Faulkner Work Order# 9505983-06, 11, 16 Reported May 23, 1995=,�
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<br />' QUALITY CONTROL DATA REPORT
<br />' Analyte: Benzene Toluene Ethyl Xylenes
<br /> Benzene
<br /> GC Batch#. G0051995STEX20A GC051995BTEX20A GC051995BTEX20A GCO51995BTEX20A
<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 #: 9505wo3 950581103 950581103 950581103
<br /> Sample Conc : ND N D ND ND
<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 # GCHP20 GCHP20 GCHP20 GCHP20
<br /> Conc.Spiked 10 pg/L 10 gig/L to ng/L 301rg/L
<br /> Result- 92 92 92 27
<br /> MS %Recovery. 92 92 92 90
<br /> Dup Result 96 96 95 28
<br />' MSD%Recov .. 96 96 95 93
<br /> RPD: 43 43 32 36
<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 />' MS/MSD
<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 is analyzed using the same reagents,
<br /> 7eggA 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 M
<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 /> Penner
<br />' Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9505983 EEE a6>
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