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' SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> Environmental Science&Engineering Client Project ID. 6 90-5137/Ryder Truck Rental <br /> ..4090 Nelson Avenue Ste. J <br /> ' Concord CA 94520 <br /> Attention Sue Wickham QC Sample Group: 102-0587 <br /> Reported: Mar 12, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ' ANALYTE <br /> Cadmium Chromium Lead Zinc <br /> ' Method: 200.7/213.2 EPA 200.7 EPA 7421 EPA6010 <br /> Analyst: S.Foster S.Foster R.Eastman S.Foster <br /> Reporting Units: mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Mar 7, 1991 Mar 7, 1991 Mar 4, 1991 Mar 7, 1991 <br /> QC Sample#: 103-0496 103-0496 102-2336 103-0496 <br /> Sample Conc.: N.D. 7.3 11 39 <br /> ' Spike Cone. <br /> Added: 500 500 100 500 <br /> Conc. Matrix <br /> Spike: 400 490 110 <br /> 440 <br /> Matrix Spike <br /> % Recovery: 80 98 98 80 <br /> Conc. Matrix <br />' Spike Dup.: 530 580 100 530 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 110 110 93 98 <br /> i <br />' Relative <br /> %Difference: 28 17 4.7 19 <br /> ISEQUOIA ANALYTICAL %Recovery: Conc. p M.S.-Conc.of Sample x 100 <br /> �elinda` <br /> , � Spike Conc.Added <br /> �., Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> C.Vega (Conc.of M.S. + Conc,of M.S.D.)/2 <br /> Laboratory Director #1020587.EEE <2> <br />