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<br /> 4D— Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4 15) 364 9600 FAX(415) 364 9233
<br /> + 404 N Wigct Lane Walnut Creek, CA 94598 (510) 988 9600 FAX(510)988 9673
<br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)911 0100
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<br /> GettEer Ryan/Geostrategles Client Project ID Unocal 0187/Stockton
<br /> 43035 Prospect Park Drive, #190 Matrix Liquid $
<br /> Rancho Cordova, CA 95670
<br /> `,Attention Greg Gurss Work Order# 9508004-05 Reported Aug 9, 1995,K
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<br /> QUALITY CONTROL DATA REPORT
<br /> Analyte Benzene Toluene Ethyl Xylenes
<br /> Benzene
<br /> QC Batch# GCO80795BTEX03A GCO80795BTEX03A GC080795BTEX03A GCO80795BTEX03A
<br /> Analy. Method: EPA 8020 EPA 6020 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#- 9507H4312 95071-14312 9507H4312 95071-14312
<br /> Sample Conc N D N D N D N D
<br /> Prepared Date 8/7/95 8/7/95 8/7/95 8/7/95
<br /> Analyzed Date 8/7/95 8/7/95 8/7/95 8/7/95
<br /> Instrument I D #. GCHP3 GCHP3 GCHP3 GCHP3
<br /> Conc. Spiked 10pg/L 10ug/L 10pg/L 30pg/L
<br /> Result- 11 11 11 33
<br /> 40S % Recovery 110 110 110 110
<br /> Dup Result 10 10 10 31
<br /> MSD % Recov. 100 100 100 103
<br /> RPD 95 95 95 63
<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 LD #
<br /> Conc Spiked-
<br /> LCS Result.
<br /> LCS %Recov.-
<br /> M M D
<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 /> U A ALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s 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 /> e regory
<br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9508004 GET <3>
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