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■ , Sequoia 680 Chesapeake Dnvc Redwood City, CA 94063 (4 15) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> OeoStrategies Inc Client Project ID Unocal #6581 <br /> }{3035 Prospect Park Dr, Suite 80 Matrix Sod t <br /> Rancho Cordova, CA 95670 <br /> Attention Gregg Gurss QC Sample Goup 408-0100 Reported Aug 16, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EP48020 ( PA 8020 EPA 8020 EPA 6010 <br /> Analyst C Chapman C Chapman C Chapman C Chapman K Anderson <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 50 mg/kg <br /> LCS Batch# LCS081194 LCS081194 LCS081194 LCS081194 LCS080594 <br /> Date Prepared 8/11/94 8/11/94 8/11/94 8/11/94 8/5/94 <br /> Date Analyzed 8/11/94 8/11/94 8/11/94 8/11/94 8/8/94 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 Liberty 100 <br /> LCS <br /> Recovery 100 100 100 100 90 <br /> Control Limits 75-125 75-125 75-125 75-125 75-125 <br /> r� • r 1 r� r�1` l r � �r. ` v v ry r } h +�r'. S r <br /> MS/MSD <br /> Batch # 4071311 4071311 4071311 4071311 4080185 <br /> Date Prepared 8/10/94 8/10/94 8/10/94 8/10/94 8/5/94 <br /> Date Analyzed 8/10/94 8/10/94 8/10/94 8/10/94 8/8/94 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 Liberty 100 <br /> Matrix Spike <br /> % Recovery 110 110 110 110 86 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 120 120 120 115 82 <br /> Relative % <br /> Difference 87 87 87 44 48 <br /> SE <br /> QUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation 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/MSDs are advisory only <br /> Jennie Higgins k and are not used to accept or reject batch results <br /> Project Manager <br /> 4080100GS] <3> <br />