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{ <br /> l i ' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 8 t9 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> ;?u-eoStrategies Inc Client Project 10 Unocal #0187 <br /> 3035 Prospect Park Dr, Suite 80 Matrix Soil " <br /> Rancho Cordova, CA 95670 { <br /> Attention Stephen J Carter OC Sample Group 5071047-1067 Reported Jul 28, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xy[enes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst N Zahedi N Zahedi N Zahedi N Zahedi <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# N/A N/A N/A N/A <br /> Date Prepared N/A N/A N/A N/A <br /> 1 <br /> Date Analyzed N/A N/A N/A N/A <br /> Instrument I D # N/A N/A N/A N/A <br /> LCS % <br /> 49 Recovery N/A N/A N/A N/A <br /> Control Limits 55-145 47-149 47-155 56-140 <br /> MS/MSD <br /> Batch# 5070365 5070365 5070365 5070365 <br /> Date Prepared: 7/27/95 7/27/95 7/27/95 7/27/95 <br /> Date Analyzed 7/27/95 7/27/95 7/27/95 7/27/95 <br /> Instrument I D #. HP-1 HP-1 HP-1 HP-1 <br /> Matrix Spike <br /> % Recovery. 74 84 89 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 87 97 99 105 <br /> Relative % <br /> I <br /> Difference 16 14 11 4 9 <br /> S UOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> reparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Janet H d n and are not used to accept or reject batch results <br /> Project Manager <br /> 5071047 G81 <5> <br />