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<br /> • / \ Sequoia 680 Chesapeake Dave Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9133
<br /> 404 tai Wigct Lane Walnut Crcck, CA 94598 (510) 988 9600 FAX(510)988 9673
<br /> VQWAnalytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 92.1 9600 FAX(916)921 0100
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<br /> t�:[iyM,f 4 ,CIien`t'Project'tD` Unocal#6981
<br /> Gold Camp Or Ste 240 Matrix Liquid x
<br /> Rancho Cordova, CA 95670 `
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<br /> Attention Greg Gurss QC Sample Group 5121825-826 Reported Dec 27, 1995iz
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<br /> QUALITY CONTROL DATA REPORT
<br /> Analyte Benzene Toluene Ethyl Xylenes
<br /> Benzene
<br /> QC Batch# GC122195 GC122195 GC122195 GC122195
<br /> 802004A 802004A 802004A 802004A
<br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020
<br /> Prep Method. EPA 5030 EPA 5030 EPA 5030 EPA 5030
<br /> AnalystN Beaman N Beaman N Beaman N Beaman
<br /> MS/MSD #. BLK122195 BLK122195 BLK122195 BLK122195
<br /> Sample Cone . N D N D N D N D
<br /> Prepared Date 12/21/95 12/21/95 12/21/95 12/21/95
<br /> Analyzed Date 12/21/95 12/21/95 12/21/95 12/21/95
<br /> Instrument I D # HP-4 HP-4 HP-4 HP-4
<br /> Cone Spiked: 20frg/L 20ug/L 20pg/L 60ug/L
<br /> Result 20 20 21 62
<br /> MS % Recovery. 100 100 105 103
<br /> Dup. Result. 23 29 24 73
<br /> MSD % Recov ,' 115 145 120 122
<br /> RPD. 14 37 13 16
<br /> RPD Limit. 0-20 0-20 0-20 0-20C.
<br /> 2
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<br /> LCS # 2LCS122195 2LCS122195 2LCS122195 2LCS122195
<br /> Prepared Date 12/21/95 12/21/95 12/21/95 12/21/95
<br /> Analyzed Date 12/21/95 12/21/95 12/21/95 12/21/95
<br /> Instrument I D.# HP-4 HP-4 HP-4 HP-4
<br /> Cone. Spiked- 20Mg/L 20ug/L 20pg/L 60ug/L
<br /> LCS Result 21 21 22 64
<br /> LCS % Recov 105 105 110 107
<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-tree matrix that is analyzed using the same reagents,
<br /> NALYTICAL, #1271 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 /> interference,the LGS recovery is to be used to validate the batch
<br />*K eTI MOr **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference
<br /> Prot t Manager
<br /> 5121825 GGG <2>
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