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+ 4 Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> iD Analytical 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686 9690 EAX(510)686 9689 <br /> 819 Sinker Avcnuc Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 Ot00 <br /> GeoStrategles Inc Client Project ID Unocal #6981 <br /> 3035 Prospect Park Dr, Suite 80 Matrix Soll <br /> Rancho Cordova, CA 95670 <br /> Attention Greg Gurss OC Sample Group 4080092-93 Reported Aug 5, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Beryllium Cadmium Chromium Nickel <br /> Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst C Ni t,h1 Cm G M <br /> Concentration <br /> Spiked 100 mg/kg 100 mg/kg 100 mg/kg 100 mg/kg <br /> I <br /> LCS Batch# BLK080394 BLK080394 BLK080394 BLK080394 <br /> Date Prepared 8/3/94 8/3/94 8/3/94 8/3/94 <br /> Date Analyzed 8/4/94 8/4/94 8/4/94 8/4/94 <br /> Instrument I D # MTJA 2 MTJA 2 MTJA 2 MTJA 2 <br /> LCS % <br />. Recovery 100 100 100 100 <br /> Control Limits 75 125 75-125 75 125 75 125 <br /> MS/MSD <br /> Batch # 9408134-1 94081341 9408134 1 9408134 1 <br /> Date Prepared 8/3/94 8/3/94 8/3/94 8/3/94 <br /> Date Analyzed 8/4/94 6/4/94 8/4/94 8/4/94 <br /> Instrument I D # MTJA 2 MTJA 2 GATJA-2 MTJA-2 <br /> Matrix Spike <br /> % Recovery 98 100 105 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 98 100 105 100 <br /> Relative % <br /> Difference 00 00 00 0 0 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> IS <br /> EQUOIA ANALYTICAL 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 OC limits for MS/MSDs are advisory only <br /> and are not used to accept or refect batch results <br /> .Je ie Higgins <br /> Project Manager 4080092 GSI <4> <br />