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<br /> Sequoia o80 Clicsapcakc Drive Redwood City,CA 94063 1415) 364 9600 rAX(415) 364 9233
<br /> ��•••{� 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673
<br /> Analytical 819 Striker Avcrnue,Suktc 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100
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<br /> Gettler Ryan/Geostrategies Client Project ID Unocal 0187/Stockton
<br /> 3035 Prospect Park Drive, #110 Matrix Liquid
<br /> Rancho Cordova, CA 95670
<br /> Attention Greg Gurss Work Order# 9508004 -01-03 Reported Aug 9, 1995r
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<br /> QUALITY CONTROL DATA REPORT
<br /> Analyte Benzene Toluene Ethyl Xylenes
<br /> Benzene
<br /> QC Batch# GCO80495BTEX02A GC080495BTEX02A GCO80495STEX02A GC080495BTEX02A
<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 /> M S/MSD# 9507J1403 9507J1403 9507J1403 9507J t 403
<br /> Sample Cone N D N D N D N D
<br /> Prepared Date 8/4/95 8/4/95 8/4/95 8/4/95
<br /> Analyzed Date 8/4/95 8/4/95 8/4/95 8/4/95
<br /> Instrument I D #. GCHP2 GCHP2 GCHP2 GGHP2
<br /> Conc Spiked 10,rg/L 10pg/L 10ug/L 30ug/L
<br /> Result 98 96 98 29
<br /> S % Recovery 98 96 98 97
<br /> Dup. Result. 10 10 10 32
<br /> MSD % Recov 100 100 100 107
<br /> RPD- 20 41 20 98
<br /> RPD Limit 0-50 0-50 0-50 0-50
<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,interferent4ree matrix that is analyzed using the same reagents,
<br /> is A ALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of saMpie
<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 /> M ke Gregory
<br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9508004 GET ¢1 7
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