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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4 15) 364 9600 FAX (415) 364 9233 <br /> /� •� Analytical 1900 Batcs Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> B19 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> OOStrate'gles Inc Client Project ID Unocal 7$27 08 <br /> 3035 Prospect Park Dr, Suite 80 Matrix Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter QC Sample Group 4070381-384 Reported Jul 26, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS072094 LCS072094 LCS072094 LCS072094 <br /> Date Prepared 7/20/94 7/20/94 7/20/94 7/20/94 <br /> Date Analyzed 7/20/94 7/20/94 7/20/94 7/20/94 <br /> Instrument i D # HP-1 HP-1 HP-1 HP-1 <br /> LCS % <br /> Recovery 110 110 110 103 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# 4070523 4070523 4070523 4070523 <br /> Date Prepared 7/20/94 7/20/94 7/20/94 7/20/94 <br /> Date Analyzed 7/20/94 7/20/94 7/20/94 7/20/94 <br /> Instrument 1 D # HP-1 HP-1 HP-1 HP-1 <br /> Matrix Spike <br /> % Recovery 110 110 110 107 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 95 97 <br /> Relative % <br /> Difference 15 15 15 98 <br /> i <br /> EQUOIA ANALYTICAL Please[vote <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> 41,l „ �' preparation and analytical methods employed for the samples The LCS%recovery data Is used for <br /> C <br /> validation of sample batch results flue to matrix effects,the OC limits for MS/MSD s are advisory only <br /> Craig C L and are not used to accept or reject batch results <br /> Project Manager <br /> 4070382 GSl <57 <br />