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• 9 <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> (i) 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> dill») Analytical <br /> rKleirifelder Client Project ID. 20 4054-01 <br /> 2825 East Myrtle St. Matrix. Soil/Water <br /> Stockton, CA 95205 <br /> Attention: Tony Martin QC Sample Group: 8020578-0580 Reported: Mar 12, 1998;1;; <br /> ' QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Lead Nickel Zinc Mercury <br /> Method: EPA 6010A EPA 6010A EPA 6010A EPA 6010A EPA 6010A EPA 7471 <br /> Analyst: S. Phillips S.Phillips S.Phillips S.Phillips S.Phillips P.Kent <br /> Concentration <br /> Spiked: 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 0.25 mg/kg <br /> ' LCS Batch#: LCS022498 LCS022498 LCS022498 LCS022498 LCS022498 LCS022698 <br /> Date Prepared: 02/24/98 02/24/98 02/24/98 02/24/98 02/24/98 02/26/98 <br /> Date Analyzed: 02/25/98 02/25/98 02/25/98 02/25/98 02/25/98 02/26/98 <br /> Instrument I.D.#: ICP-1 ICP-1 ICP-1 ICP-1 ICP-1 HG-1 <br /> LCS % <br /> Recovery: 93 96 94 96 97 99 <br /> Control Limits: 80-120% 80-120% 80-120% 80-120% 80-120% 80-120% <br /> .... <br /> .: :::.:..... <br /> ::::::::::..::::::::::::::::::::::.:.:::::::.::::::..::.. .::::. ..... <br /> ' MS/MSD <br /> Batch#: 8020618 8020618 8020618 8020618 8020618 8020308 <br /> Date Prepared: 02/24/98 02/24/98 02/24/98 02/24/98 02/24/98 02/26/98 <br /> Date Analyzed: 02/25/98 02/25/98 02/25/98 02/25/98 02/25/98 02/26/98 <br /> Instrument I.D.#: ICP-1 ICP-1 ICP-1 ICP-1 ICP-1 HG-1 <br /> Matrix Spike <br /> % Recovery: 70 68 65 67 78 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 73 66 66 66 77 100 <br /> Relative % <br /> Difference: 4.2 3.0 1.5 1.5 1.3 7.3 <br /> I Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> XEA 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 QC limits for MS/MSD's are advisory only <br /> and are not used to acce t or reject batch results. <br /> SchneiderManager/Sacramento Laboratory <br /> 8020578.KLF <25> <br />