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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9604 FAX(4 15) 364 9233 <br /> Analytical 1900 Bates Avenue,SUL(c L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> 819 Sinker Avenue,Suite 8 Sacramento, CA 95834 (916) 92t 9600 FAX (916)921 0100 <br /> eoStrategies Inc Client project ID Unocal #6981 <br /> 035 prospect Park Dr. Suite 80 Matrix Sod <br /> Rancho Cordova, CA 95670 <br /> Attention Greg Gurss QC Sample Goup 4080092-93 Reported Aug 5, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 PPA 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# LCS080394 LCS080394 LCS080394 LCS080394 <br /> Date Prepared 8/3/94 8/3/94 8/3/94 8/3/94 <br /> Date Analyzed 8/3/94 8/3/94 8/3/94 8/3/94 <br /> Instrument I ❑ # HP-1 HP-1 HP-1 HP 1 <br /> LCS <br /> Recovery 105 105 105 103 <br /> Control Limits 75-125 75-125 75 125 75-125 <br /> MS/MSD <br /> Batch # 4071204 4071204 4071204 4071204 <br /> Date Prepared 8/3/94 8/3/94 8/3/94 8/3/94 <br /> Date Analyzed 8/3/94 8/3/94 8/3/94 8/3/94 <br /> instrument I D # HP-1 HPI HP-1 HP 1 <br /> Matrix Spike <br /> % Recovery 115 110 115 112 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 105 100 105 103 <br /> Relative % <br /> Difference 91 95 91 84 <br /> QUOIA ANALYTICAL Please Nate <br /> The LCS 1s 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 and are not used to accept or reject batch results <br /> Project Manager 4080092 GSI <3> <br />